{"id":53956,"date":"2026-05-16T07:50:11","date_gmt":"2026-05-16T07:50:11","guid":{"rendered":"https:\/\/xtmim.com\/?page_id=53956"},"modified":"2026-05-18T01:23:22","modified_gmt":"2026-05-18T01:23:22","slug":"erreurs-de-conception","status":"publish","type":"page","link":"https:\/\/xtmim.com\/fr\/mim-design-guide\/design-mistakes\/","title":{"rendered":"Erreurs de conception MIM"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"53956\" class=\"elementor elementor-53956\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4109d29 e-con-full e-flex cmsmasters-bg-hide-none cmsmasters-bg-hide-none cmsmasters-block-default e-con e-parent\" data-id=\"4109d29\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-c5acbc6 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"c5acbc6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e823db4 cmsmasters-breadcrumbs-type-rank cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-cmsmasters-breadcrumbs cmsmasters-widget-breadcrumbs\" data-id=\"e823db4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"cmsmasters-breadcrumbs.default\">\n\t\t\t\t\t<div class=\"cmsmasters-widget-breadcrumbs__container\"><div class=\"cmsmasters-widget-breadcrumbs__content\"><nav aria-label=\"breadcrumbs\" class=\"rank-math-breadcrumb\"><p><span class=\"last\">Home<\/span><\/p><\/nav><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f97c7a elementor-widget__width-initial cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"6f97c7a\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-fade-in-up&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">MIM Design Mistakes: DFM Risks Before Tooling<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-de9874c cmsmasters-button-mobile-align-left cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-cmsmasters-button\" data-id=\"de9874c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-pop-in&quot;,&quot;_animation_delay&quot;:600}\" data-widget_type=\"cmsmasters-button.default\">\n\t\t\t\t\t<div class=\"elementor-widget-cmsmasters-button__button-container\"><div class=\"elementor-widget-cmsmasters-button__button-container-inner\"><a href=\"https:\/\/xtmim.com\/contact-us\/\" class=\"cmsmasters-button-link elementor-widget-cmsmasters-button__button cmsmasters-icon-view- cmsmasters-icon-shape- cmsmasters-button-size-sm\" role=\"button\" tabindex=\"0\"><span class=\"elementor-widget-cmsmasters-button__content-wrapper cmsmasters-align-icon-\"><span class=\"elementor-widget-cmsmasters-button__text\">Get Your Project Quote Now<\/span><\/span><\/a><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-60b0a59 e-con-full cmsmasters-effect cmsmasters-effect-type-transform e-flex cmsmasters-effect-hover-type-element cmsmasters-block-default e-con e-child\" data-id=\"60b0a59\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;position&quot;:&quot;absolute&quot;,&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a2f6aff e-con-full e-flex cmsmasters-block-default e-con e-parent\" data-id=\"a2f6aff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a84442f e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"a84442f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5412087 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-html\" data-id=\"5412087\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\r\n  .xtmim-design-mistakes {\r\n    --xt-primary: #183b5b;\r\n    --xt-primary-dark: #10283f;\r\n    --xt-primary-soft: #eaf2f8;\r\n    --xt-accent: #d96c2c;\r\n    --xt-accent-soft: #fff3ea;\r\n    --xt-bg: #ffffff;\r\n    --xt-bg-soft: #f6f8fb;\r\n    --xt-border: #dbe3ea;\r\n    --xt-text: #24313d;\r\n    --xt-muted: #5f6f7f;\r\n    --xt-radius-sm: 10px;\r\n    --xt-radius-md: 18px;\r\n    --xt-radius-lg: 26px;\r\n    --xt-shadow-sm: 0 10px 30px 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1px solid var(--xt-border);\r\n    border-radius: var(--xt-radius-lg);\r\n    padding: 28px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-note {\r\n    background: #f9fbfd;\r\n    border-left: 5px solid var(--xt-primary);\r\n    border-radius: 16px;\r\n    padding: 18px 20px;\r\n    margin: 22px 0;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-warning {\r\n    background: var(--xt-accent-soft);\r\n    border-left: 5px solid var(--xt-accent);\r\n    border-radius: 16px;\r\n    padding: 18px 20px;\r\n    margin: 22px 0;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-grid-2 {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 22px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-grid-3 {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 18px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-check-card {\r\n    background: #fff;\r\n    border: 1px solid var(--xt-border);\r\n    border-radius: var(--xt-radius-md);\r\n    padding: 20px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-check-card strong {\r\n    color: var(--xt-primary-dark);\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-tag {\r\n    display: inline-block;\r\n    background: var(--xt-primary-soft);\r\n    color: var(--xt-primary-dark);\r\n    border-radius: 999px;\r\n    padding: 4px 10px;\r\n    font-size: 13px;\r\n    font-weight: 700;\r\n    margin-bottom: 8px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-toc {\r\n    background: #fff;\r\n    border: 1px solid var(--xt-border);\r\n    border-radius: var(--xt-radius-lg);\r\n    padding: 24px;\r\n    box-shadow: var(--xt-shadow-sm);\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-toc h2 {\r\n    font-size: clamp(24px, 2.6vw, 32px);\r\n    margin-bottom: 14px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-toc-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 10px 18px;\r\n    margin: 0;\r\n    padding-left: 20px;\r\n 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#fff;\r\n    margin: 22px 0;\r\n    -webkit-overflow-scrolling: touch;\r\n  }\r\n\r\n  .xtmim-design-mistakes table {\r\n    width: 100%;\r\n    border-collapse: collapse;\r\n    min-width: 820px;\r\n  }\r\n\r\n  .xtmim-design-mistakes th {\r\n    background: var(--xt-primary);\r\n    color: #fff;\r\n    text-align: left;\r\n    padding: 14px 16px;\r\n    font-size: 14px;\r\n    line-height: 1.45;\r\n  }\r\n\r\n  .xtmim-design-mistakes td {\r\n    border-top: 1px solid var(--xt-border);\r\n    padding: 14px 16px;\r\n    vertical-align: top;\r\n    font-size: 15px;\r\n  }\r\n\r\n  .xtmim-design-mistakes tr:nth-child(even) td {\r\n    background: #f9fbfd;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-cta {\r\n    background: linear-gradient(135deg, var(--xt-primary-dark) 0%, var(--xt-primary) 100%);\r\n    color: #fff;\r\n    border-radius: var(--xt-radius-lg);\r\n    padding: 34px;\r\n    box-shadow: var(--xt-shadow-md);\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-cta h2,\r\n  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margin: 12px 0;\r\n    padding: 18px 20px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-faq summary {\r\n    cursor: pointer;\r\n    font-weight: 700;\r\n    color: var(--xt-primary-dark);\r\n    min-height: 32px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-faq details p {\r\n    margin-top: 12px;\r\n  }\r\n\r\n  .xtmim-design-mistakes .xtmim-author,\r\n  .xtmim-design-mistakes .xtmim-standards {\r\n    background: #fff;\r\n    border: 1px solid var(--xt-border);\r\n    border-radius: var(--xt-radius-lg);\r\n    padding: 26px;\r\n  }\r\n\r\n  @media (max-width: 900px) {\r\n    .xtmim-design-mistakes {\r\n      padding: 0 18px;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-hero-grid,\r\n    .xtmim-design-mistakes .xtmim-grid-2,\r\n    .xtmim-design-mistakes .xtmim-grid-3,\r\n    .xtmim-design-mistakes .xtmim-toc-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-section {\r\n      margin: 26px 0;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-hero,\r\n    .xtmim-design-mistakes .xtmim-card,\r\n    .xtmim-design-mistakes .xtmim-card-soft,\r\n    .xtmim-design-mistakes .xtmim-cta,\r\n    .xtmim-design-mistakes .xtmim-toc {\r\n      padding: 22px;\r\n      border-radius: 20px;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-lead {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .xtmim-design-mistakes h2 {\r\n      font-size: 27px;\r\n    }\r\n\r\n    .xtmim-design-mistakes h3 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .xtmim-design-mistakes table {\r\n      min-width: 760px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 600px) {\r\n    .xtmim-design-mistakes {\r\n      padding: 0 16px;\r\n      line-height: 1.68;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-hero,\r\n    .xtmim-design-mistakes .xtmim-card,\r\n    .xtmim-design-mistakes .xtmim-card-soft,\r\n    .xtmim-design-mistakes .xtmim-cta,\r\n    .xtmim-design-mistakes .xtmim-author,\r\n    .xtmim-design-mistakes .xtmim-standards,\r\n    .xtmim-design-mistakes .xtmim-toc {\r\n      padding: 20px;\r\n    }\r\n\r\n    .xtmim-design-mistakes h2 {\r\n      font-size: 25px;\r\n    }\r\n\r\n    .xtmim-design-mistakes h3 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-cta-actions {\r\n      display: grid;\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .xtmim-design-mistakes .xtmim-btn {\r\n      width: 100%;\r\n      text-align: center;\r\n    }\r\n\r\n    .xtmim-design-mistakes figcaption,\r\n    .xtmim-design-mistakes .xtmim-figure-note {\r\n      padding-left: 16px;\r\n      padding-right: 16px;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article class=\"xtmim-design-mistakes\">\r\n\r\n \r\n\r\n  <section class=\"xtmim-section xtmim-hero\" id=\"overview\">\r\n    <div class=\"xtmim-hero-grid\">\r\n      <div class=\"xtmim-hero-body\">\r\n        <div class=\"xtmim-eyebrow\">Pre-Tooling MIM DFM Review<\/div>\r\n        <p class=\"xtmim-lead\">Common MIM design mistakes usually start in the drawing stage, but their cost appears later in tooling, molding, debinding, sintering, inspection, or secondary operations. For a product design engineer, the key question is not only whether the geometry can be molded. The part must also survive green part handling, debind without trapped binder risk, shrink predictably during sintering, hold critical dimensions, and avoid unnecessary post-sintering machining. A CNC prototype drawing or plastic injection molded concept may still need MIM-specific DFM review because metal injection molding uses fine metal powder and binder feedstock, injection molding, debinding, high-temperature sintering, and tooling compensation. This page helps identify design errors that should be reviewed before mold release, including wall thickness variation, unsupported features, undercuts, gate marks, parting lines, shrinkage assumptions, tolerance strategy, material confirmation, and incomplete RFQ information.<\/p>\r\n      <\/div>\r\n      <aside class=\"xtmim-hero-card\">\r\n        <strong>Use this page when your drawing is close to RFQ or tooling review.<\/strong>\r\n        <ul class=\"xtmim-mini-list\">\r\n          <li>Identify design risks before mold release.<\/li>\r\n          <li>Separate CAD issues from tooling, sintering, tolerance, inspection, and cost issues.<\/li>\r\n          <li>Use this page as a mistake diagnosis and routing page, not as a replacement for dedicated wall thickness, gate, mold, tolerance, shrinkage, or DFM guides.<\/li>\r\n          <li>Move deeper into the <a href=\"https:\/\/xtmim.com\/mim-design-guide\/\">complete MIM design guide<\/a> when a topic needs detailed design rules.<\/li>\r\n        <\/ul>\r\n      <\/aside>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"xtmim-figure\">\r\n    <img fetchpriority=\"high\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/01-mim-design-mistake-risk-flow-before-tooling.webp\" alt=\"MIM design mistake risk flow showing how drawing errors affect tooling, molding, green part handling, debinding, sintering, tolerance control, inspection, and cost before production.\" title=\"MIM Design Mistake Risk Flow Before Tooling\" width=\"1774\" height=\"887\" loading=\"eager\" fetchpriority=\"high\" decoding=\"async\">\r\n    <figcaption>Common MIM design mistakes often begin in the drawing stage but become visible later as tooling risk, sintering distortion, tolerance drift, inspection difficulty, or secondary operation cost.<\/figcaption>\r\n    <div class=\"xtmim-figure-note\">Core conclusion: A MIM design mistake is rarely isolated. One drawing-level decision can affect molding, green part handling, debinding, sintering shrinkage, final inspection, and production cost.<\/div>\r\n  <\/figure>\r\n\r\n  <nav class=\"xtmim-section xtmim-toc\" aria-label=\"Page contents\">\r\n    <h2>Page Contents<\/h2>\r\n    <ol class=\"xtmim-toc-grid\">\r\n      <li><a href=\"#before-tooling\">Which mistakes should be fixed before tooling?<\/a><\/li>\r\n      <li><a href=\"#priority-map\">Mistake priority map<\/a><\/li>\r\n      <li><a href=\"#common-mistakes\">Common MIM design mistakes<\/a><\/li>\r\n      <li><a href=\"#guide-matrix\">Mistake-to-risk guide matrix<\/a><\/li>\r\n      <li><a href=\"#correction-decision\">Redesign, machining, or process review<\/a><\/li>\r\n      <li><a href=\"#drawing-checklist\">Drawing review checklist<\/a><\/li>\r\n      <li><a href=\"#engineering-scenarios\">Composite engineering scenarios<\/a><\/li>\r\n      <li><a href=\"#related-articles\">Related quality review articles<\/a><\/li>\r\n      <li><a href=\"#faq\">FAQs<\/a><\/li>\r\n      <li><a href=\"#project-review\">Submit drawing for review<\/a><\/li>\r\n      <li><a href=\"#standards\">Standards and technical references<\/a><\/li>\r\n    <\/ol>\r\n  <\/nav>\r\n\r\n  <section class=\"xtmim-section xtmim-card\" id=\"before-tooling\">\r\n    <h2>Which MIM Design Mistakes Should Be Fixed Before Tooling?<\/h2>\r\n    <p>The design mistakes that matter most are the ones that become expensive after the mold is built. In practice, a feature that looks minor in CAD may require a slide, create flash risk, weaken a green part, restrict debinding, change sintering support, or force a secondary machining step. Once tooling is released, these issues are no longer just design comments; they become mold correction, sampling delay, dimensional adjustment, or cost escalation.<\/p>\r\n    <p>From a design review perspective, mistakes should be checked in the order of manufacturing risk, not simply by drawing appearance. Tooling access, wall thickness, sintering support, critical tolerance control, protected surfaces, and RFQ completeness should all be reviewed before mold design is frozen.<\/p>\r\n\r\n    <div class=\"xtmim-grid-3\">\r\n      <div class=\"xtmim-check-card\">\r\n        <span class=\"xtmim-tag\">Tooling feasibility<\/span>\r\n        <p>Can the part be filled, released, ejected, and controlled without excessive mold complexity?<\/p>\r\n      <\/div>\r\n      <div class=\"xtmim-check-card\">\r\n        <span class=\"xtmim-tag\">Sintering stability<\/span>\r\n        <p>Can the part shrink and rest during sintering without unacceptable distortion or flatness loss?<\/p>\r\n      <\/div>\r\n      <div class=\"xtmim-check-card\">\r\n        <span class=\"xtmim-tag\">Critical dimension control<\/span>\r\n        <p>Are tight tolerances applied only where they are functionally required?<\/p>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"xtmim-note\">\r\n      <p><strong>Page boundary:<\/strong> This page is a pre-tooling mistake review page. It does not replace the detailed guides for wall thickness, gate design, mold design, shrinkage compensation, or MIM tolerances. When a specific mistake becomes the main project risk, use the related guide for deeper review instead of expanding every topic on this page.<\/p>\r\n    <\/div>\r\n\r\n    <p>For a complete review workflow, see the <a href=\"https:\/\/xtmim.com\/mim-design-guide\/dfm\/\">MIM DFM review process<\/a> and the <a href=\"https:\/\/xtmim.com\/mim-checklist\/mim-dfm-design-checklist\/\">MIM DFM design checklist<\/a>.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card-soft\" id=\"priority-map\">\r\n    <h2>Mistake Priority Map: From Design Error to Production Risk<\/h2>\r\n    <p>The following map helps engineers decide which problems should be reviewed first. It is not a replacement for project-specific DFM review, but it helps identify where design, tooling, sintering, tolerance, and cost risks usually begin.<\/p>\r\n\r\n    <div class=\"xtmim-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Priority<\/th>\r\n            <th>Design Mistake Type<\/th>\r\n            <th>Main Production Risk<\/th>\r\n            <th>Review Before Tooling<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>High<\/td>\r\n            <td>Internal undercuts, blocked tooling direction, unsupported core pins<\/td>\r\n            <td>Complex slides, flash, mold cost, release risk<\/td>\r\n            <td>Mold opening direction, parting line, core pin support<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>High<\/td>\r\n            <td>Thick sections or sudden wall transitions<\/td>\r\n            <td>Non-uniform shrinkage, distortion, cracking, sink marks<\/td>\r\n            <td>Wall thickness, coring, rib design, transition radius<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>High<\/td>\r\n            <td>No sintering support surface for long spans or cantilevers<\/td>\r\n            <td>Warpage, flatness loss, dimensional drift<\/td>\r\n            <td>Setter contact surface, orientation, support strategy<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>High<\/td>\r\n            <td>Tight tolerances applied to all dimensions<\/td>\r\n            <td>High inspection cost, machining demand, sampling corrections<\/td>\r\n            <td>Critical dimensions, datum strategy, as-sintered vs machined features<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Medium<\/td>\r\n            <td>Gate mark placed on a functional or cosmetic surface<\/td>\r\n            <td>Surface defect, sealing issue, assembly interference<\/td>\r\n            <td>Gate location, flow path, protected surface map<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Medium<\/td>\r\n            <td>Material, heat treatment, or surface finish confirmed late<\/td>\r\n            <td>Property mismatch, cost change, process changes<\/td>\r\n            <td>Material grade, hardness, corrosion, magnetic or wear requirement<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Medium<\/td>\r\n            <td>RFQ drawing lacks datums, application, annual volume, or inspection notes<\/td>\r\n            <td>Incomplete quotation, unclear manufacturability review<\/td>\r\n            <td>2D\/3D files, critical dimensions, application background<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <figure class=\"xtmim-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/02-mim-design-mistake-priority-map.webp\" alt=\"MIM design mistake priority map showing tooling direction, wall thickness, sintering support, tolerance, surface mark, material, and RFQ input risks before mold release.\" title=\"MIM Design Mistake Priority Map\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>A practical priority map helps engineers review MIM design mistakes by production impact, not by CAD appearance alone.<\/figcaption>\r\n      <div class=\"xtmim-figure-note\">Core conclusion: The highest-priority MIM design mistakes are the ones that affect tooling feasibility, sintering stability, and critical dimension control before mold release.<\/div>\r\n    <\/figure>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card\" id=\"common-mistakes\">\r\n    <h2>Common MIM Design Mistakes and Practical Corrections<\/h2>\r\n    <p>This section summarizes frequent MIM design errors found during pre-tooling review. Each mistake is handled as a decision point: what the mistake is, why it matters in MIM, what can go wrong, and where to continue reading if the part needs deeper review.<\/p>\r\n\r\n    <h3>Mistake 1: Treating a CNC or Plastic Injection Drawing as MIM-Ready<\/h3>\r\n    <p>A common mistake is sending a CNC prototype drawing or plastic injection molded part design directly for MIM quotation. CNC design often accepts sharp internal corners, deep machined pockets, and features that assume material is removed from a solid block. Plastic injection molding may also use design assumptions that do not fully reflect MIM green strength, debinding path, sintering shrinkage, or metal powder feedstock behavior.<\/p>\r\n    <p>The correction is to review the part as a MIM part, not only as a shape. Check whether the geometry can be filled with feedstock, released from the mold, handled as a green part, debound without trapped binder risk, supported during sintering, and inspected against real critical dimensions. For more detail, review <a href=\"https:\/\/xtmim.com\/mim-design-guide\/part-design\/\">MIM part design principles<\/a> and the related article on <a href=\"https:\/\/xtmim.com\/blogs\/metal-injection-molding-design-guide\/\">metal injection molding design for complex precision parts<\/a>.<\/p>\r\n\r\n    <h3>Mistake 2: Designing Thick or Non-Uniform Wall Sections<\/h3>\r\n    <p>Wall thickness variation is one of the most common sources of MIM risk. Thick sections can slow debinding, increase material usage, and create non-uniform shrinkage. Sudden transitions between thick and thin areas can also create stress concentration, sink marks, distortion, or cracking risk.<\/p>\r\n    <p>The correction is not always to make every area thin. The real goal is to make wall thickness more uniform where feasible, use coring or rib design where appropriate, and avoid abrupt section changes. For critical parts, thick zones should be reviewed together with gate location, debinding path, sintering orientation, and tolerance requirements. Continue into the <a href=\"https:\/\/xtmim.com\/mim-design-guide\/wall-thickness\/\">MIM wall thickness design guide<\/a> or the article on <a href=\"https:\/\/xtmim.com\/blogs\/how-part-dimensions-affect-final-mim-part-quality\/\">how part dimensions affect final MIM part quality<\/a>.<\/p>\r\n\r\n    <h3>Mistake 3: Using Abrupt Transitions, Sharp Corners, and Stress Concentration Features<\/h3>\r\n    <p>Sharp internal corners and abrupt section transitions may look acceptable in CAD, but they often create manufacturing risk in MIM. During injection molding, flow may hesitate around abrupt geometry. During ejection and green part handling, fragile features may crack or deform. During sintering, stress concentration and uneven shrinkage may increase distortion risk.<\/p>\r\n    <p>The correction is to review radius, transition geometry, and feature location before tooling. Internal corners should be softened where function allows. Thin-to-thick transitions should be gradual. If a sharp edge is functionally required, it should be identified as a critical feature so the supplier can decide whether it should be molded, coined, machined, or otherwise controlled after sintering.<\/p>\r\n\r\n    <h3>Mistake 4: Adding Holes, Slots, or Undercuts Without Tooling Direction Review<\/h3>\r\n    <p>MIM can produce complex holes, slots, side features, and undercuts, but they still need mold direction review. A hole that cannot be supported properly may bend a core pin. A slot near a thin wall may create filling or ejection risk. An internal undercut may require slides, collapsible cores, machining after molding, or a design change.<\/p>\r\n    <p>The correction is to review each hole, slot, and undercut according to mold opening direction, core pin support, parting line feasibility, seal-off area, and flash risk. Internal undercuts should not be treated as \u201cfree complexity.\u201d They may be justified for functional value, but they should be reviewed before the mold design is frozen. Continue with <a href=\"https:\/\/xtmim.com\/mim-design-guide\/holes-slots-undercuts\/\">MIM holes, slots, and undercuts<\/a> and <a href=\"https:\/\/xtmim.com\/mim-design-guide\/mold-design\/\">MIM mold design<\/a>.<\/p>\r\n\r\n    <h3>Mistake 5: Placing Gates, Parting Lines, or Ejector Marks on Critical Surfaces<\/h3>\r\n    <p>Gate marks, parting line vestiges, ejector marks, and slide witness marks are not only cosmetic issues. If they are placed on sealing surfaces, datum surfaces, sliding contact areas, assembly interfaces, or visible cosmetic zones, they may affect function, inspection, or customer acceptance.<\/p>\r\n    <p>The correction is to define protected surfaces before tooling. A good MIM drawing should identify functional faces, cosmetic zones, datum surfaces, assembly contacts, and surfaces that cannot accept gate vestige or parting line mismatch. The supplier can then review gate location, flow path, parting line position, ejection strategy, and secondary finishing options. Read more about <a href=\"https:\/\/xtmim.com\/mim-design-guide\/gate-design\/\">MIM gate design<\/a>, <a href=\"https:\/\/xtmim.com\/mim-design-guide\/mold-design\/\">mold design<\/a>, and <a href=\"https:\/\/xtmim.com\/blogs\/how-mold-design-affects-part-quality-in-mim\/\">mold design quality risks in MIM<\/a>.<\/p>\r\n\r\n    <figure class=\"xtmim-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/03-protected-surface-gate-mark-review-mim-parts.webp\" alt=\"MIM part surface review map showing protected functional surfaces, cosmetic surfaces, gate mark zones, parting line zones, and ejector mark considerations before tooling.\" title=\"Protected Surface and Gate Mark Review for MIM Parts\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>Gate marks, parting lines, ejector marks, and slide witness marks should be reviewed against protected functional, cosmetic, sealing, datum, and assembly surfaces before mold design.<\/figcaption>\r\n      <div class=\"xtmim-figure-note\">Core conclusion: The mistake is not only placing a gate in the wrong location; the real mistake is failing to define which surfaces must be protected before tooling starts.<\/div>\r\n    <\/figure>\r\n\r\n    <h3>Mistake 6: Ignoring Sintering Support Surfaces and Unsupported Features<\/h3>\r\n    <p>MIM parts shrink during sintering, and the part must be supported in a way that protects shape, flatness, and critical dimensions. Long spans, thin arms, cantilevers, delicate points, and asymmetric mass distribution may distort if the design does not provide stable support areas.<\/p>\r\n    <p>The correction is to review the part\u2019s sintering orientation early. Identify surfaces that can contact setters or supports without damaging functional or cosmetic requirements. If no acceptable support surface exists, the design may need small geometry changes, support pads, sacrificial surfaces, or a different orientation strategy. This is why sintering distortion control begins with geometry and support planning, not only with furnace settings. Continue with <a href=\"https:\/\/xtmim.com\/mim-design-guide\/sintering-supports\/\">MIM sintering supports<\/a> and <a href=\"https:\/\/xtmim.com\/blogs\/debinding-and-sintering-affect-part-quality-in-mim\/\">debinding and sintering quality risks<\/a>.<\/p>\r\n\r\n    <h3>Mistake 7: Assuming Shrinkage Is Uniform on Every Feature<\/h3>\r\n    <p>A dangerous assumption is treating MIM shrinkage as one simple scale factor that applies equally to every feature. In reality, shrinkage control depends on material, feedstock, mold design, part geometry, wall thickness, sintering support, furnace conditions, and how dimensions are measured.<\/p>\r\n    <p>The correction is to identify critical dimensions and discuss shrinkage compensation before tooling. Some dimensions may be stable as-sintered. Others may need mold adjustment after first samples. A few highly critical features may require secondary machining. The key is to separate functional dimensions from non-critical dimensions instead of applying the same tolerance expectation everywhere. Continue with <a href=\"https:\/\/xtmim.com\/mim-design-guide\/shrinkage-compensation\/\">MIM shrinkage compensation<\/a> and <a href=\"https:\/\/xtmim.com\/mim-design-guide\/mim-tolerances\/\">MIM tolerances<\/a>.<\/p>\r\n\r\n    <h3>Mistake 8: Applying Tight Tolerances to Every Dimension<\/h3>\r\n    <p>Over-tolerancing is one of the easiest ways to increase MIM project risk. If every dimension is marked as critical, the supplier cannot easily separate molded features, as-sintered features, machined features, and inspection reference features. This can increase sampling effort, inspection cost, mold correction cycles, and unnecessary secondary operations.<\/p>\r\n    <p>The correction is to classify dimensions into functional groups: critical-to-function, assembly-related, cosmetic, reference-only, and non-critical. Tight tolerances should be reserved for dimensions that truly affect function. Where a feature must be tighter than normal as-sintered capability, secondary machining, sizing, coining, or grinding may need to be reviewed. Continue with the <a href=\"https:\/\/xtmim.com\/mim-design-guide\/mim-tolerances\/\">MIM tolerance guide<\/a> and the <a href=\"https:\/\/xtmim.com\/mim-checklist\/mim-tolerance-shrinkage-checklist\/\">MIM tolerance and shrinkage checklist<\/a>.<\/p>\r\n\r\n    <h3>Mistake 9: Confirming Material, Heat Treatment, or Surface Finish Too Late<\/h3>\r\n    <p>Material selection is not a final decoration step. In MIM, material grade, heat treatment, surface finish, corrosion requirement, magnetic performance, hardness, wear behavior, and biocompatibility requirements can affect shrinkage behavior, sintering cycle, secondary operations, inspection, and cost.<\/p>\r\n    <p>The correction is to confirm material and performance requirements before RFQ or at least before tooling. If the material is still open, the drawing should define application conditions: load, wear, corrosion, temperature, magnetic response, contact surface, and cosmetic expectations. The supplier can then review whether a standard MIM material is suitable or whether an alternative material family should be considered. Review the <a href=\"https:\/\/xtmim.com\/metal-injection-molding\/mim-materials\/\">MIM materials guide<\/a> and the article on <a href=\"https:\/\/xtmim.com\/blogs\/how-material-selection-affects-mim-part-quality\/\">material-related MIM quality risks<\/a>.<\/p>\r\n\r\n    <h3>Mistake 10: Sending RFQ Drawings Without Critical Dimensions, Datums, or Annual Volume<\/h3>\r\n    <p>A MIM RFQ is not only a price request. It is also a manufacturability review. If the drawing does not identify critical dimensions, datums, protected surfaces, material requirements, surface finish, application, annual volume, and inspection expectations, the supplier may quote with assumptions that later become technical or commercial problems.<\/p>\r\n    <p>The correction is to send both 2D drawings and 3D CAD files where possible. Mark critical dimensions clearly. Separate as-sintered and post-machined requirements. Identify protected surfaces and acceptable mark areas. Provide expected annual volume because tooling strategy, cavity planning, sampling logic, and cost review depend on production quantity. Use the <a href=\"https:\/\/xtmim.com\/mim-checklist\/mim-dfm-design-checklist\/\">MIM DFM design checklist<\/a>, <a href=\"https:\/\/xtmim.com\/request-a-quote\/\">request a quote<\/a>, or <a href=\"https:\/\/xtmim.com\/contact-us\/\">contact XTMIM for drawing review<\/a>.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card-soft\" id=\"guide-matrix\">\r\n    <h2>Mistake-to-Risk-to-Guide Matrix<\/h2>\r\n    <p>Use this matrix to decide whether to keep reading this page or move into a more detailed design guide. The goal is not to duplicate every design topic, but to direct each mistake to the correct review path.<\/p>\r\n\r\n    <div class=\"xtmim-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Design Mistake<\/th>\r\n            <th>Manufacturing Risk<\/th>\r\n            <th>What to Review<\/th>\r\n            <th>Related Guide<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>CNC drawing copied directly into MIM<\/td>\r\n            <td>Fragile features, poor shrinkage planning, unnecessary machining<\/td>\r\n            <td>Geometry, wall transitions, critical surfaces<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/part-design\/\">MIM Part Design<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Thick or uneven wall sections<\/td>\r\n            <td>Debinding difficulty, distortion, cracking, sink marks<\/td>\r\n            <td>Wall uniformity, coring, transition design<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/wall-thickness\/\">Wall Thickness Design<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Holes or undercuts not reviewed for tooling direction<\/td>\r\n            <td>Slides, core pin bending, flash, high mold cost<\/td>\r\n            <td>Core support, mold direction, parting line<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/holes-slots-undercuts\/\">Holes, Slots and Undercuts<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Gate placed on protected surface<\/td>\r\n            <td>Cosmetic defect, sealing issue, assembly interference<\/td>\r\n            <td>Gate location, flow path, protected surface map<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/gate-design\/\">Gate Design<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>No sintering support plan<\/td>\r\n            <td>Warpage, flatness loss, dimensional variation<\/td>\r\n            <td>Setter contact, orientation, support surface<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/sintering-supports\/\">Sintering Supports<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Uniform shrinkage assumption<\/td>\r\n            <td>Dimensional mismatch after sintering<\/td>\r\n            <td>Critical dimension map, mold scaling, sample correction<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/shrinkage-compensation\/\">Shrinkage Compensation<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Tight tolerance applied everywhere<\/td>\r\n            <td>Cost increase, inspection burden, machining demand<\/td>\r\n            <td>Datum strategy, as-sintered vs machined dimensions<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/mim-tolerances\/\">MIM Tolerances<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Late cost review<\/td>\r\n            <td>Over-complex tooling or secondary operation cost<\/td>\r\n            <td>Cost drivers, mold complexity, post-processing<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/design-for-cost\/\">Design for Cost<\/a><\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>No structured drawing review<\/td>\r\n            <td>Missed risks before tooling<\/td>\r\n            <td>DFM workflow and RFQ input<\/td>\r\n            <td><a href=\"https:\/\/xtmim.com\/mim-design-guide\/dfm\/\">DFM for MIM<\/a><\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card\" id=\"correction-decision\">\r\n    <h2>When a Design Mistake Requires Redesign, Machining, or Process Review<\/h2>\r\n    <p>Not every MIM design mistake has the same solution. Some problems require CAD redesign. Some can be solved by mold strategy. Some should be controlled by secondary operations. Some may indicate that MIM is not the best manufacturing route for the part.<\/p>\r\n\r\n    <figure class=\"xtmim-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/04-mim-design-correction-decision-map.webp\" alt=\"MIM design correction decision map showing when a mistake requires CAD redesign, tooling strategy review, secondary machining, or process suitability review.\" title=\"MIM Design Correction Decision Map\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>Not every MIM design mistake has the same correction path. Some require CAD redesign, some can be handled by tooling strategy, some need secondary machining, and some require process suitability review.<\/figcaption>\r\n      <div class=\"xtmim-figure-note\">Core conclusion: The correct response to a MIM design mistake depends on whether the root cause is geometry, tooling access, tolerance demand, sintering support, or process suitability.<\/div>\r\n    <\/figure>\r\n\r\n    <div class=\"xtmim-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Situation<\/th>\r\n            <th>Preferred Action<\/th>\r\n            <th>Engineering Reason<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>Thick section creates debinding and shrinkage risk<\/td>\r\n            <td>Redesign, coring, or wall transition review<\/td>\r\n            <td>Geometry is the root cause; machining later does not remove internal process risk.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Critical bore requires tighter accuracy than as-sintered capability<\/td>\r\n            <td>Consider secondary machining<\/td>\r\n            <td>Machining may be more stable than forcing the entire part into tight tolerance.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Internal undercut requires complex slides<\/td>\r\n            <td>Redesign or review tooling feasibility<\/td>\r\n            <td>Added tooling complexity may increase cost, flash risk, and mold maintenance.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Long unsupported span distorts during sintering<\/td>\r\n            <td>Add support surface or revise orientation strategy<\/td>\r\n            <td>Sintering distortion must be controlled through design and support planning.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Large simple part has low complexity and high material usage<\/td>\r\n            <td>Reconsider MIM suitability<\/td>\r\n            <td>PM, CNC, casting, stamping, or another route may be more economical than MIM.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Cosmetic surface cannot accept gate or parting line marks<\/td>\r\n            <td>Revise gate\/parting line plan or add finishing<\/td>\r\n            <td>Surface requirements must be known before mold design.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <div class=\"xtmim-warning\">\r\n      <p><strong>Process suitability note:<\/strong> MIM is usually strongest for small, complex, high-density metal parts where geometry consolidation, fine features, and production volume justify tooling. A large simple part with low complexity, high material usage, or very low annual demand may need a process comparison before committing to MIM tooling.<\/p>\r\n    <\/div>\r\n\r\n    <p>For cost-driven decisions, review <a href=\"https:\/\/xtmim.com\/mim-design-guide\/design-for-cost\/\">MIM design for cost<\/a>. If the part may not be suitable for MIM, use the <a href=\"https:\/\/xtmim.com\/mim-checklist\/mim-suitability-checklist\/\">MIM suitability checklist<\/a> before committing to tooling.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card-soft\" id=\"drawing-checklist\">\r\n    <h2>Drawing Review Checklist Before MIM Tooling<\/h2>\r\n    <p>Before releasing a MIM mold, review the drawing with the following checklist. This should happen before tooling, not after first samples, because late clarification can turn into mold assumptions, sample correction, inspection disagreement, or unnecessary secondary operation cost.<\/p>\r\n\r\n    <figure class=\"xtmim-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/05-mim-drawing-review-checklist-before-tooling.webp\" alt=\"MIM drawing review checklist showing critical dimensions, datums, protected surfaces, material requirements, surface finish, tolerances, annual volume, and application notes before tooling.\" title=\"MIM Drawing Review Checklist Before Tooling\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>A clear MIM RFQ drawing should identify critical dimensions, datums, protected surfaces, material requirements, tolerances, surface expectations, annual volume, and application conditions before tooling review.<\/figcaption>\r\n      <div class=\"xtmim-figure-note\">Core conclusion: Better RFQ information leads to better MIM DFM review. Missing drawing details can turn into tooling assumptions, tolerance disputes, or production cost changes.<\/div>\r\n    <\/figure>\r\n\r\n    <div class=\"xtmim-grid-2\">\r\n      <div class=\"xtmim-check-card\">\r\n        <strong>Drawing and geometry inputs<\/strong>\r\n        <ul class=\"xtmim-mini-list\">\r\n          <li>Are critical dimensions clearly marked?<\/li>\r\n          <li>Are datum references defined?<\/li>\r\n          <li>Are protected surfaces identified?<\/li>\r\n          <li>Are acceptable gate mark, parting line, and ejector mark areas defined?<\/li>\r\n          <li>Are wall thickness transitions reviewed?<\/li>\r\n          <li>Are holes, slots, and undercuts reviewed against mold direction?<\/li>\r\n          <li>Are unsupported sintering areas identified?<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n      <div class=\"xtmim-check-card\">\r\n        <strong>RFQ and production inputs<\/strong>\r\n        <ul class=\"xtmim-mini-list\">\r\n          <li>Are tolerances separated into as-sintered and machined requirements?<\/li>\r\n          <li>Are material, heat treatment, and surface finish requirements confirmed?<\/li>\r\n          <li>Is estimated annual volume provided?<\/li>\r\n          <li>Is the application environment known?<\/li>\r\n          <li>Are inspection methods or acceptance requirements defined for key features?<\/li>\r\n          <li>Are secondary operation expectations stated before quotation?<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <p>Use the <a href=\"https:\/\/xtmim.com\/mim-checklist\/mim-dfm-design-checklist\/\">MIM DFM design checklist<\/a>, the <a href=\"https:\/\/xtmim.com\/mim-checklist\/mim-tolerance-shrinkage-checklist\/\">tolerance and shrinkage checklist<\/a>, or <a href=\"https:\/\/xtmim.com\/submit-drawing-for-review\/\">submit your drawing for review<\/a> before tooling release.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card\" id=\"engineering-scenarios\">\r\n    <h2>Composite Field Scenarios for Engineering Training<\/h2>\r\n    <p>The following scenarios are composite engineering examples for training. They do not represent a named customer project. The purpose is to show how several small drawing mistakes can combine into tooling, sintering, tolerance, and surface acceptance risks.<\/p>\r\n\r\n    <figure class=\"xtmim-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/06-composite-mim-design-mistake-scenario.webp\" alt=\"Composite MIM design mistake scenario showing how thick bosses, unsupported arms, gate mark location, and missing critical dimension review can combine into tooling and sintering risk.\" title=\"Composite MIM Design Mistake Scenario\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>A composite MIM design scenario shows how several small drawing mistakes can combine into tooling, sintering, tolerance, and surface acceptance risks.<\/figcaption>\r\n      <div class=\"xtmim-figure-note\">Core conclusion: Most failed design reviews are not caused by one isolated mistake. They usually come from several small CAD, tooling, tolerance, and surface-planning omissions combined together.<\/div>\r\n    <\/figure>\r\n\r\n    <div class=\"xtmim-grid-2\">\r\n      <div class=\"xtmim-card-soft\">\r\n        <h3>Scenario 1: Small Bracket with Thick Bosses and Unsupported Arms<\/h3>\r\n        <p><strong>What problem occurred:<\/strong> A small precision bracket was designed from a CNC prototype. It included two thick bosses, thin arms, sharp internal transitions, and a flatness requirement across an unsupported span.<\/p>\r\n        <p><strong>Why it happened:<\/strong> The original drawing was optimized for machining from solid stock, not for MIM feedstock flow, debinding, sintering shrinkage, or support during firing.<\/p>\r\n        <p><strong>Real system cause:<\/strong> The thick bosses affected shrinkage, the sharp transitions concentrated stress, and the thin arms had limited support during sintering. The flatness requirement was applied without reviewing setter contact surfaces.<\/p>\r\n        <p><strong>Correction:<\/strong> The design was revised with more uniform wall transitions, improved radius design, reduced local mass, and an agreed support surface. Critical dimensions were separated from general dimensions.<\/p>\r\n        <p><strong>Prevention:<\/strong> Review wall thickness, support surfaces, critical dimensions, and functional surfaces together before tooling.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-card-soft\">\r\n        <h3>Scenario 2: Miniature Housing with Gate Mark on a Functional Surface<\/h3>\r\n        <p><strong>What problem occurred:<\/strong> A miniature metal housing included a sealing surface, internal side features, and a cosmetic outside face. The initial gate and parting line concept placed visible marks near a functional contact area.<\/p>\r\n        <p><strong>Why it happened:<\/strong> The RFQ drawing did not identify protected surfaces, acceptable mark zones, or assembly contact areas. The supplier could not clearly separate cosmetic surfaces from functional surfaces during early tool review.<\/p>\r\n        <p><strong>Real system cause:<\/strong> The part was feasible for MIM, but the drawing did not tell the tool designer which surfaces had to remain protected.<\/p>\r\n        <p><strong>Correction:<\/strong> The drawing was updated with protected surface zones, acceptable gate mark areas, datum references, and inspection priorities.<\/p>\r\n        <p><strong>Prevention:<\/strong> Every MIM RFQ should include surface function information, especially for sealing, sliding, visible, datum, and assembly-contact areas.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card-soft\" id=\"related-articles\">\r\n    <h2>Related Engineering Articles for Deeper Quality Review<\/h2>\r\n    <p>Use these supporting articles when a design mistake needs process or quality root-cause review rather than general design routing. The current page identifies mistakes before tooling; the articles below explain how those risks affect part quality, material behavior, injection molding, debinding, sintering, and final dimensions.<\/p>\r\n\r\n    <div class=\"xtmim-grid-2\">\r\n      <div class=\"xtmim-check-card\">\r\n        <strong>Design and dimensional quality<\/strong>\r\n        <ul class=\"xtmim-mini-list\">\r\n          <li><a href=\"https:\/\/xtmim.com\/blogs\/how-part-design-affects-part-quality-in-mim\/\">How part design affects MIM quality<\/a><\/li>\r\n          <li><a href=\"https:\/\/xtmim.com\/blogs\/how-part-dimensions-affect-final-mim-part-quality\/\">Part dimensions and final MIM quality<\/a><\/li>\r\n          <li><a href=\"https:\/\/xtmim.com\/blogs\/what-affects-part-quality-in-mim\/\">MIM part quality risk factors<\/a><\/li>\r\n        <\/ul>\r\n      <\/div>\r\n      <div class=\"xtmim-check-card\">\r\n        <strong>Process and material quality<\/strong>\r\n        <ul class=\"xtmim-mini-list\">\r\n          <li><a href=\"https:\/\/xtmim.com\/blogs\/how-feedstock-affects-part-quality-in-mim\/\">Feedstock-related filling risks<\/a><\/li>\r\n          <li><a href=\"https:\/\/xtmim.com\/blogs\/how-injection-molding-affects-part-quality-in-mim\/\">Injection molding defects in MIM<\/a><\/li>\r\n          <li><a href=\"https:\/\/xtmim.com\/blogs\/how-material-selection-affects-mim-part-quality\/\">Material-related MIM quality risks<\/a><\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-card-soft xtmim-faq\" id=\"faq\">\r\n    <h2>FAQs About Common MIM Design Mistakes<\/h2>\r\n\r\n    <details>\r\n      <summary>What is the most common MIM design mistake?<\/summary>\r\n      <p>The most common mistake is designing the part as if it were only a CAD shape, instead of reviewing how it will be molded, debound, sintered, supported, measured, and possibly machined. Wall thickness variation, missing tolerance strategy, and unreviewed tooling direction are among the most frequent design review issues.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can I use a CNC drawing directly for MIM production?<\/summary>\r\n      <p>A CNC drawing can be used as a starting point, but it should not be treated as automatically MIM-ready. CNC designs often include features that are easy to machine but risky or expensive to mold, debind, sinter, or inspect. A MIM DFM review should check wall thickness, shrinkage, protected surfaces, tooling direction, tolerances, and secondary operation needs.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Why do MIM parts warp after sintering?<\/summary>\r\n      <p>Sintering distortion can result from uneven wall thickness, asymmetric mass distribution, unsupported spans, poor setter contact, tight flatness requirements, or shrinkage variation. The furnace process matters, but design and support strategy often determine whether the part has a stable path through sintering.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Are tight tolerances always a mistake in MIM?<\/summary>\r\n      <p>No. Tight tolerances are not a mistake when they are functionally necessary and reviewed early. The mistake is applying tight tolerances to every dimension without separating critical features from non-critical features. Some dimensions may be suitable as-sintered, while others may need machining, sizing, coining, or inspection planning.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Should gate marks and parting lines be specified before tooling?<\/summary>\r\n      <p>Yes. Gate marks, parting lines, ejector marks, and slide witness marks should be discussed before tooling, especially when the part has cosmetic surfaces, sealing faces, datum surfaces, or assembly contact areas. Waiting until after sampling may limit correction options.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can MIM design mistakes be corrected after tooling?<\/summary>\r\n      <p>Some design mistakes can be corrected after tooling through mold adjustment, process tuning, or secondary machining, but corrections after mold release are usually more limited and more expensive than pre-tooling DFM changes. Geometry-driven risks such as severe thick-to-thin transitions, unsupported sintering spans, unrealistic tolerance stack-ups, or blocked tooling direction should be reviewed before tooling.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Which MIM design mistakes increase tooling cost the most?<\/summary>\r\n      <p>Tooling cost usually increases when the part requires complex slides, weak or long core pins, difficult parting lines, internal undercuts, tight seal-off areas, or repeated mold correction after sampling. A pre-tooling review should check mold opening direction, holes and slots, protected surfaces, and critical dimensions before the mold design is frozen.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>When should I request a MIM DFM review?<\/summary>\r\n      <p>Request a MIM DFM review before tooling, especially if the part has thin walls, thick sections, undercuts, tight tolerances, cosmetic surfaces, sealing faces, long spans, small holes, special materials, or high annual production expectations.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What information should I send for a MIM design review?<\/summary>\r\n      <p>Send 2D drawings, 3D CAD files, material requirements, heat treatment needs, surface finish expectations, critical dimensions, datums, protected surfaces, inspection requirements, annual volume, and application background. These details help the supplier review manufacturability, tolerance strategy, tooling risk, and production feasibility.<\/p>\r\n    <\/details>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-cta\" id=\"project-review\">\r\n    <h2>Submit Your Drawing for MIM DFM Review<\/h2>\r\n    <p>For parts with thin walls, thick sections, undercuts, small holes, cosmetic surfaces, sealing faces, tight tolerances, or unclear material requirements, send your drawing before tooling for MIM DFM review.<\/p>\r\n    <p>Please provide the following inputs when available:<\/p>\r\n    <ul class=\"xtmim-mini-list\">\r\n      <li>2D drawing and 3D CAD file;<\/li>\r\n      <li>material grade or performance requirement;<\/li>\r\n      <li>critical dimensions, datum references, and tolerance requirements;<\/li>\r\n      <li>surface finish expectations and protected cosmetic or functional surfaces;<\/li>\r\n      <li>estimated annual volume and application background.<\/li>\r\n    <\/ul>\r\n    <p>The XTMIM engineering team can review whether the design is suitable for MIM, which features may require redesign, where tooling risk may occur, how shrinkage and sintering support should be considered, and which tolerances may need secondary machining or special inspection before tooling, sampling, or production approval.<\/p>\r\n    <div class=\"xtmim-cta-actions\">\r\n      <a class=\"xtmim-btn\" href=\"https:\/\/xtmim.com\/contact-us\/\">Contact XTMIM<\/a>\r\n      <a class=\"xtmim-btn xtmim-btn-secondary\" href=\"https:\/\/xtmim.com\/submit-drawing-for-review\/\">Submit Drawing for Review<\/a>\r\n      <a class=\"xtmim-btn xtmim-btn-secondary\" href=\"https:\/\/xtmim.com\/request-a-quote\/\">Request a Quote<\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-author\" id=\"engineering-review\">\r\n    <h2>Engineering Review Note<\/h2>\r\n    <p><strong>Reviewed by: XTMIM Engineering Team<\/strong><\/p>\r\n    <p>This article was prepared and reviewed from the perspective of MIM process suitability, part design, DFM review, tooling risk, sintering shrinkage, material suitability, tolerance strategy, inspection requirements, and production feasibility. The review focuses on practical issues that commonly appear before tooling, including wall thickness variation, holes and undercuts, gate and parting line planning, sintering support, critical dimensions, RFQ completeness, and secondary operation requirements.<\/p>\r\n    <p>This article does not replace project-specific engineering review. Final manufacturability, tolerance capability, material selection, tooling strategy, and inspection planning should be confirmed using actual drawings, 3D files, application conditions, and production volume requirements.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-standards\" id=\"standards\">\r\n    <h2>Standards and Technical References Note<\/h2>\r\n    <p>MIM design decisions should be reviewed using both project-specific DFM analysis and relevant industry references. The <a href=\"https:\/\/www.mimaweb.org\/DesignCenter\/ComplexDesignswithMIM.aspx\" target=\"_blank\" rel=\"nofollow noopener\">MIMA Complex Designs with MIM<\/a> reference is especially relevant to this page because it discusses design issues such as gate location, holes, slots, parting lines, mold complexity, and tooling cost considerations for MIM components.<\/p>\r\n    <p><a href=\"https:\/\/www.mpif.org\/Resources\/Standards.aspx\" target=\"_blank\" rel=\"nofollow noopener\">MPIF Standard 35-MIM<\/a> is relevant for material specification because it covers common materials used in metal injection molding with explanatory notes and definitions. It should support material and performance discussions, but it should not be treated as a universal rulebook for all design mistakes, tooling decisions, or tolerance outcomes.<\/p>\r\n    <p>The <a href=\"https:\/\/www.epma.com\/what-is-pm\/powder-metallurgy-process\/metal-injection-moulding-mim\/\" target=\"_blank\" rel=\"nofollow noopener\">EPMA introduction to Metal Injection Moulding<\/a> is useful for process-boundary judgment because it explains that MIM is mainly suited to complex-shaped parts in higher quantities and may not be economical when a part can be made by conventional pressing and sintering. This supports the recommendation to review process suitability before committing to MIM tooling.<\/p>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"BreadcrumbList\",\r\n  \"itemListElement\": [\r\n    {\r\n      \"@type\": \"ListItem\",\r\n      \"position\": 1,\r\n      \"name\": \"Home\",\r\n      \"item\": \"https:\/\/xtmim.com\/\"\r\n    },\r\n    {\r\n      \"@type\": \"ListItem\",\r\n      \"position\": 2,\r\n      \"name\": \"MIM Design Guide\",\r\n      \"item\": \"https:\/\/xtmim.com\/mim-design-guide\/\"\r\n    },\r\n    {\r\n      \"@type\": \"ListItem\",\r\n      \"position\": 3,\r\n      \"name\": \"Common MIM Design Mistakes\",\r\n      \"item\": \"https:\/\/xtmim.com\/mim-design-guide\/design-mistakes\/\"\r\n    }\r\n  ]\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"TechArticle\",\r\n  \"headline\": \"MIM Design Mistakes: DFM Risks Before Tooling\",\r\n  \"description\": \"Identify MIM design mistakes that affect molding, debinding, sintering, shrinkage, tolerances, cosmetic surfaces, tooling cost, and production risk.\",\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/xtmim.com\/mim-design-guide\/design-mistakes\/\"\r\n  },\r\n  \"url\": \"https:\/\/xtmim.com\/mim-design-guide\/design-mistakes\/\",\r\n  \"image\": [\r\n    \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/01-mim-design-mistake-risk-flow-before-tooling.webp\",\r\n    \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/02-mim-design-mistake-priority-map.webp\",\r\n    \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/03-protected-surface-gate-mark-review-mim-parts.webp\",\r\n    \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/04-mim-design-correction-decision-map.webp\",\r\n    \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/05-mim-drawing-review-checklist-before-tooling.webp\",\r\n    \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/05\/06-composite-mim-design-mistake-scenario.webp\"\r\n  ],\r\n  \"author\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"XTMIM Engineering Team\",\r\n    \"url\": \"https:\/\/xtmim.com\/\"\r\n  },\r\n  \"publisher\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"XTMIM\",\r\n    \"url\": \"https:\/\/xtmim.com\/\"\r\n  },\r\n  \"about\": [\r\n    \"Metal Injection Molding\",\r\n    \"MIM Design\",\r\n    \"MIM DFM\",\r\n    \"MIM Tooling Review\",\r\n    \"MIM Tolerance Control\",\r\n    \"Sintering Shrinkage\"\r\n  ],\r\n  \"keywords\": [\r\n    \"common MIM design mistakes\",\r\n    \"MIM design mistakes\",\r\n    \"metal injection molding design mistakes\",\r\n    \"MIM part design mistakes\",\r\n    \"MIM DFM mistakes\",\r\n    \"MIM design errors before tooling\",\r\n    \"MIM manufacturability mistakes\"\r\n  ],\r\n  \"proficiencyLevel\": \"Intermediate\",\r\n  \"articleSection\": \"MIM Design Guide\",\r\n  \"reviewedBy\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"XTMIM Engineering Team\"\r\n  }\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What is the most common MIM design mistake?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"The most common mistake is designing the part as if it were only a CAD shape, instead of reviewing how it will be molded, debound, sintered, supported, measured, and possibly machined. Wall thickness variation, missing tolerance strategy, and unreviewed tooling direction are among the most frequent design review issues.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can I use a CNC drawing directly for MIM production?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"A CNC drawing can be used as a starting point, but it should not be treated as automatically MIM-ready. CNC designs often include features that are easy to machine but risky or expensive to mold, debind, sinter, or inspect. A MIM DFM review should check wall thickness, shrinkage, protected surfaces, tooling direction, tolerances, and secondary operation needs.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Why do MIM parts warp after sintering?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Sintering distortion can result from uneven wall thickness, asymmetric mass distribution, unsupported spans, poor setter contact, tight flatness requirements, or shrinkage variation. The furnace process matters, but design and support strategy often determine whether the part has a stable path through sintering.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Are tight tolerances always a mistake in MIM?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. Tight tolerances are not a mistake when they are functionally necessary and reviewed early. The mistake is applying tight tolerances to every dimension without separating critical features from non-critical features. Some dimensions may be suitable as-sintered, while others may need machining, sizing, coining, or inspection planning.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Should gate marks and parting lines be specified before tooling?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Yes. Gate marks, parting lines, ejector marks, and slide witness marks should be discussed before tooling, especially when the part has cosmetic surfaces, sealing faces, datum surfaces, or assembly contact areas. Waiting until after sampling may limit correction options.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can MIM design mistakes be corrected after tooling?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Some design mistakes can be corrected after tooling through mold adjustment, process tuning, or secondary machining, but corrections after mold release are usually more limited and more expensive than pre-tooling DFM changes. Geometry-driven risks such as severe thick-to-thin transitions, unsupported sintering spans, unrealistic tolerance stack-ups, or blocked tooling direction should be reviewed before tooling.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Which MIM design mistakes increase tooling cost the most?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Tooling cost usually increases when the part requires complex slides, weak or long core pins, difficult parting lines, internal undercuts, tight seal-off areas, or repeated mold correction after sampling. A pre-tooling review should check mold opening direction, holes and slots, protected surfaces, and critical dimensions before the mold design is frozen.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"When should I request a MIM DFM review?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Request a MIM DFM review before tooling, especially if the part has thin walls, thick sections, undercuts, tight tolerances, cosmetic surfaces, sealing faces, long spans, small holes, special materials, or high annual production expectations.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What information should I send for a MIM design review?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Send 2D drawings, 3D CAD files, material requirements, heat treatment needs, surface finish expectations, critical dimensions, datums, protected surfaces, inspection requirements, annual volume, and application background. These details help the supplier review manufacturability, tolerance strategy, tooling risk, and production feasibility.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Home MIM Design Mistakes: DFM Risks Before Tooling Get Your Project Quote Now Pre-Tooling MIM DFM Review Common MIM design mistakes usually start in the drawing stage, but their cost appears later in tooling, molding, debinding, sintering, inspection, or secondary operations. For a product design engineer, the key question is not only whether the geometry&#8230;<\/p>","protected":false},"author":1,"featured_media":53935,"parent":53542,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-53956","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/pages\/53956","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/comments?post=53956"}],"version-history":[{"count":7,"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/pages\/53956\/revisions"}],"predecessor-version":[{"id":54109,"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/pages\/53956\/revisions\/54109"}],"up":[{"embeddable":true,"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/pages\/53542"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/media\/53935"}],"wp:attachment":[{"href":"https:\/\/xtmim.com\/fr\/wp-json\/wp\/v2\/media?parent=53956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}