A part is usually a good candidate for metal injection molding when it is compact, geometrically complex, requires engineering metal performance, and has enough repeat production demand to justify tooling and process development. The strongest MIM projects are not selected only because the part is small or precise. They usually combine difficult CNC machining, multiple features in different directions, possible part consolidation, material performance requirements, stable annual demand, and realistic tolerance expectations. This checklist is an early-stage suitability screen before RFQ, tooling review, or detailed DFM work. If a part passes this first review, it should move into DFM, material, tolerance, shrinkage, and production feasibility review. If the part is prototype-only, very simple, too large, constantly changing, or requires machining-level tolerance on nearly every surface, another process may be more practical.
For broader design background, review the MIM design guide. If your part already appears suitable and you need deeper manufacturability review, continue with the MIM DFM design checklist.
Quick MIM Suitability Screening Checklist
Use this quick screen before sending a drawing for MIM review. A project does not need to meet every strong signal, but it should show enough geometry, material, volume, or current-process pain to justify deeper engineering evaluation.
| Screening Question | Strong MIM Signal | Warning Signal |
|---|---|---|
| Is the part compact and geometrically complex? | Small to medium metal part with ribs, grooves, side holes, undercuts, internal forms, or integrated features. | Large, flat, simple, or mostly turned geometry with little near-net-shape value. |
| Is the current manufacturing route inefficient? | CNC machining, assembly, burr removal, material waste, or inspection cost is increasing at repeat volume. | The current process is simple, stable, low-risk, and already cost-effective. |
| Are the material requirements clear? | The project has defined strength, hardness, corrosion, wear, magnetic, heat, or application requirements. | The material is described only as “metal” or “stainless steel” without performance context. |
| Are tolerance expectations realistic? | Critical dimensions and functional interfaces are identified for shrinkage review or selective secondary machining. | Nearly every surface is marked with machining-level tolerance without a clear functional reason. |
| Is the project close to production intent? | Design geometry is mostly stable and the project has repeat demand or a defined production plan. | The part is prototype-only, frequently changing, or still in early concept validation. |
| Can MIM reduce parts, setups, or secondary operations? | One molded metal component may replace multiple machined or assembled parts. | The part would still require extensive machining on most surfaces after sintering. |
What This Checklist Covers—and What It Does Not Replace
This page is a project suitability screen. It helps decide whether a drawing is worth deeper MIM engineering review. It does not replace detailed DFM, material selection, tolerance compensation, tooling design, supplier audit, or final production validation.
| This Page Helps You Decide | This Page Does Not Replace | Recommended Next Review |
|---|---|---|
| Whether a part is worth MIM review before RFQ. | A full design-for-manufacturing review. | MIM DFM design checklist |
| Whether geometry, production demand, and current process pain support MIM screening. | A detailed wall thickness, gate, mold, or sintering support design guide. | MIM design rules after suitability screening |
| Whether material requirements are clear enough for engineering review. | A final material grade recommendation or performance guarantee. | MIM material selection checklist |
| Whether tolerance expectations need shrinkage or secondary operation review. | A detailed tolerance compensation plan or first-article correction strategy. | MIM tolerance and shrinkage checklist |
| What information should be sent before project evaluation. | A supplier qualification audit or final production approval process. | MIM supplier evaluation checklist |
When Is a Part a Good Candidate for MIM?
A strong MIM candidate usually has a manufacturing problem that cannot be solved efficiently by simple machining, stamping, conventional powder metallurgy pressing, or casting. From a design review perspective, the question is not only “Can MIM make this part?” The better question is “Does MIM solve enough geometry, material, repeatability, cost, or assembly problems to justify tooling and process validation?”
The Part Has Complex 3D Geometry That Is Costly to Machine Repeatedly
MIM becomes more attractive when the part contains small ribs, grooves, side holes, cross holes, undercuts, splines, internal forms, thin functional sections, or multiple features in different directions. These features may be possible by CNC machining, but repeated machining time, tool access, burr control, dimensional alignment, and inspection cost can become difficult at production scale.
A common mistake is to judge MIM only by part size. Small parts are not automatically good MIM parts. A simple turned pin, washer, flat bracket, or low-feature bushing may be better suited for CNC, stamping, conventional PM, or another route. MIM gains value when geometry is difficult enough that near-net-shape forming can reduce repeated cutting, assembly, or secondary operations.
The Part Needs Real Engineering Metal Performance
MIM should be reviewed when the part needs a true metal structure, not only a metallic appearance. Functional requirements may include strength, wear resistance, corrosion resistance, hardness, magnetic response, heat resistance, or dimensional stability under assembly load. At this stage, the checklist should not force a final grade decision. It should confirm whether the project has a clear material or performance requirement.
If the user only says “stainless steel” without explaining corrosion environment, hardness target, load condition, sliding wear, magnetic function, or assembly condition, the suitability review remains incomplete. The material family may look possible, but the final choice still depends on application conditions, sintering behavior, heat treatment, surface finishing, and inspection expectations. For material-specific review, use the MIM material selection checklist.
The Production Volume Can Justify Tooling and Process Development
MIM uses tooling, feedstock control, injection molding, debinding, sintering, shrinkage compensation, secondary operation planning, and inspection validation. For this reason, it is usually more suitable for repeated production than for one-off prototype work. The exact economic threshold depends on part complexity, material, tooling design, cavity strategy, current process cost, expected scrap risk, and required secondary operations.
In practice, a complex part with expensive CNC machining may justify MIM at a lower volume than a simple part. A simple part may require much higher volume before MIM becomes practical. The suitability checklist should therefore ask for estimated annual volume, expected project life, current process, and the real reason behind the process change.
The Part Can Reduce Machining, Assembly, or Material Waste Through Near-Net-Shape Forming
MIM is often worth reviewing when several machined components may be combined into one molded metal part, or when a part currently requires multiple milling, turning, drilling, broaching, grinding, or assembly steps. The benefit is not only cost reduction. Fewer operations may also reduce tolerance stack-up, assembly variation, burr risk, handling damage, and inspection complexity.
However, MIM is not a way to remove all secondary work. Critical holes, threads, sealing surfaces, bearing seats, sliding surfaces, or precision fits may still require machining, sizing, reaming, tapping, grinding, polishing, coating, or final inspection after sintering. Suitability depends on whether those secondary operations are limited, functional, and controlled, not whether they disappear completely.
| Good Candidate Signal | Why It Matters | What to Check First |
|---|---|---|
| Small to medium metal part with complex features | MIM can form difficult geometry near net shape. | Confirm feature direction, tool access, gate strategy, and green part handling risk. |
| Current CNC cost is high | Repeated machining may be inefficient at volume. | Compare machining steps, cycle time, burr risk, dimensional alignment, and inspection demand. |
| Multiple parts may be consolidated | MIM can reduce assembly steps and tolerance stack-up. | Confirm whether one-piece design creates molding, debinding, or sintering distortion risk. |
| Material performance is required | MIM is selected for functional metal parts, not decorative metal-like parts. | Confirm strength, hardness, corrosion, wear, magnetic, heat, or assembly requirements. |
| Stable repeat demand exists | Tooling and process development need production justification. | Confirm annual volume, project life, demand stability, and ramp-up expectation. |
| Only selected critical areas need tight control | MIM can combine near-net shape with targeted secondary machining. | Identify critical dimensions, datum strategy, tolerance stack-up, and inspection method. |
MIM Suitability Scorecard: Check These Factors First
The suitability scorecard should be used before detailed DFM review. It does not replace engineering evaluation, but it helps identify whether the project deserves a deeper MIM discussion. A reliable scorecard should separate clear fit, review-needed fit, and high-risk conditions before the project enters tooling, sampling, or cost negotiation.
Part Size and Mass
Compact parts are usually easier to review for MIM because molding, debinding, and sintering are easier to control than with large heavy parts. Larger parts may still be possible in selected cases, but mass, wall balance, debinding path, furnace support, distortion risk, and inspection method require closer review.
Geometry Complexity
MIM becomes more valuable as geometry becomes more complex. Parts with multiple small features, internal or side features, curved surfaces, integrated functions, or difficult machining access are stronger candidates.
Wall Thickness Balance
Wall thickness does not need to be identical everywhere, but severe transitions, heavy sections, isolated thick zones, unsupported thin features, and sharp section changes can create molding, debinding, or sintering risk. Detailed wall design belongs to the MIM wall thickness design page.
Feature Direction and Moldability
Side holes, undercuts, recesses, slots, or internal forms may improve the MIM value case, but they also affect mold construction, parting line strategy, side actions, core pins, ejection, and green part strength. See holes, slots and undercuts in MIM for deeper design guidance.
Material Requirement
The material requirement should be specific enough to support engineering review. “Metal” is not enough. “Stainless steel” may still be too broad without corrosion, wear, hardness, magnetic, heat, or assembly requirements.
Tolerance Expectation
MIM can produce near-net-shape parts, but final tolerance capability depends on material, geometry, part size, sintering support, shrinkage stability, secondary operations, and inspection method. Critical-dimension projects should continue with the MIM tolerance and shrinkage checklist.
| Checklist Factor | Strong MIM Fit | Needs Engineering Review | High Risk / Consider Another Process |
|---|---|---|---|
| Part size and mass | Compact small-to-medium metal part | Larger part with strong complexity value | Large simple part with no strong MIM advantage |
| Geometry complexity | Multiple small 3D features or integrated functions | Some difficult features need tooling review | Simple flat, turned, or pressed geometry |
| Wall thickness balance | Mostly balanced sections | Local thick/thin transitions need DFM review | Severe wall imbalance or heavy unsupported sections |
| Feature direction | Features justify molding value | Side features need core, slide, or ejection review | Features create fragile green part or tool release risk |
| Material requirement | Clear metal performance target | Material family known, grade undecided | Vague material need or unverified alloy route |
| Tolerance expectation | Critical dimensions are defined | Several tight zones need shrinkage review | Nearly all surfaces require machining-level tolerance |
| Production volume | Stable repeat production | Volume uncertain but project has strong complexity | Prototype-only or frequently changing design |
| Secondary operations | Limited and functional | Several operations need cost review | Heavy machining removes most MIM value |
| Design maturity | Geometry and function mostly stable | Some changes expected before tooling | Design still in early concept |
| Current process pain point | CNC, assembly, waste, or repeatability issue is clear | Cost driver needs review | No clear reason to change process |
When MIM May Not Be the Right Manufacturing Route
A reliable suitability checklist should reject weak MIM projects as clearly as it accepts strong candidates. This protects the buyer from unnecessary tooling cost and helps the engineering team focus on parts where MIM creates real value. In early screening, rejecting a poor MIM candidate is not a failure; it is part of responsible process selection.
Stop the MIM review temporarily if: the part is still changing frequently, the geometry is large and simple, the project is prototype-only, the material requirement is unclear, nearly every surface needs machining-level tolerance, or the current process does not have a clear cost, quality, assembly, or repeatability problem.
The Project Is Prototype-Only or Still Changing Frequently
MIM can support product development, but full MIM tooling is usually not the first choice when the design is still changing every week. If the part is only needed for concept validation, CNC machining, additive manufacturing, soft tooling, or another prototyping route may be more practical. MIM should be reviewed when the design is approaching production intent.
The Part Is Large, Simple, or Flat
A large simple part does not become a good MIM candidate only because it is metal. If the geometry can be produced efficiently by stamping, conventional PM, casting, die casting, extrusion, or simple machining, MIM may add unnecessary feedstock, tooling, debinding, sintering, and dimensional control complexity.
Nearly Every Surface Requires Machining-Level Tolerance
MIM is a near-net-shape process. It can work well when most surfaces can remain as-sintered and only selected functional areas need secondary machining. It becomes less attractive when the drawing requires very tight tolerance on almost all surfaces, because the project may turn into a molded blank followed by extensive machining.
The Material or Application Requirement Is Unclear
A part cannot be properly evaluated for MIM if the material requirement is vague. Engineers need to understand the operating environment, load, wear, corrosion, temperature, magnetic behavior, surface finish, and assembly condition. Without this information, the material and process route may be technically possible but commercially risky.
The Geometry Creates High Debinding or Sintering Distortion Risk
Some parts look attractive for MIM because they are complex, but the same complexity may create debinding difficulty, fragile green features, unsupported spans, distortion, cracking, or uneven shrinkage. These problems do not automatically reject the part, but they require DFM review before tooling. For related design risks, review MIM sintering supports and MIM shrinkage compensation.
| Risk Condition | Why It Matters | Better Next Step |
|---|---|---|
| Prototype-only quantity | Tooling and process setup may not be justified. | Use a prototype process first, then review MIM after design freeze. |
| Large simple geometry | MIM may add cost without geometry benefit. | Compare stamping, casting, PM, or CNC based on geometry and tolerance needs. |
| Frequent design changes | Tool changes can create cost, delay, and validation uncertainty. | Freeze functional geometry before MIM tooling. |
| Tight tolerance on most surfaces | Secondary machining may remove MIM cost advantage. | Define critical dimensions and review tolerance strategy. |
| Vague material requirement | Material route cannot be confirmed reliably. | Provide performance targets and application conditions. |
| Severe unsupported features | Debinding or sintering distortion risk may increase. | Request DFM and sintering support review. |
| No clear current process pain point | MIM may not solve a real engineering or cost problem. | Compare cost, quality, repeatability, and assembly drivers first. |
Composite Field Scenario for Engineering Training: CNC Part Considered for MIM
- What problem occurred
- A small stainless steel component was being machined from bar stock. The part included side features, internal grooves, and several small functional surfaces. The buyer wanted to reduce machining time and improve repeatability.
- Why it happened
- The geometry was possible by CNC, but repeated machining required several setups and careful burr control. Inspection time also increased because multiple machined features had to align functionally.
- What the real system cause was
- The issue was not simply the CNC price. The real cause was that the design used a geometry more suitable for near-net-shape forming than repeated subtractive machining.
- How it was corrected
- The part was screened for MIM suitability. The engineering review separated as-sintered surfaces from critical post-machined surfaces and checked whether side features could be molded without excessive tooling risk.
- How to prevent recurrence
- Before converting a CNC part to MIM, review geometry complexity, critical dimensions, secondary machining zones, annual volume, and material performance requirements together. Do not compare only unit price.
Composite Field Scenario for Engineering Training: Part Rejected for MIM at Early Review
- What problem occurred
- A buyer asked whether a large flat metal plate with several holes should be converted to MIM because the current CNC quote seemed high.
- Why it happened
- The buyer assumed that MIM was automatically lower cost for metal parts at volume.
- What the real system cause was
- The part had low geometry complexity and a large simple form. The drawing did not show enough molded complexity to justify MIM tooling, debinding, sintering, and dimensional control work.
- How it was corrected
- The project was not moved into MIM tooling review. The buyer was advised to compare stamping, laser cutting, conventional machining, or another route depending on thickness, flatness, hole tolerance, and volume.
- How to prevent recurrence
- Use MIM when geometry, material performance, production demand, and current process pain point combine to create value. Do not select MIM only because the part is metal.
How MIM Compares with CNC, PM, Casting, Stamping, and 3D Printing in Early Screening
This checklist is not a full process comparison page, but many users reach MIM suitability review because they are comparing manufacturing routes. The first screening should identify whether MIM deserves deeper review, not declare it the best process in every case. A process that is technically possible may still be commercially or dimensionally unsuitable for a specific project.
| Current or Alternative Process | MIM May Be Worth Reviewing When | MIM May Not Be Better When | Recommended Next Step |
|---|---|---|---|
| CNC machining | Repeated machining is costly, features are small and complex, burr control is difficult. | Volume is low, design changes often, or only simple machining is required. | Review MIM design for cost. |
| Conventional PM | The geometry is too complex for uniaxial pressing or requires side features. | The part is simple, regular, cost-sensitive, and well suited to pressing. | Compare PM and MIM based on geometry, density, material, and tolerance requirements. |
| Die casting | A small steel or stainless part needs higher material performance than typical die-cast alloys. | Aluminum or zinc die casting already meets performance and cost targets. | Review material and application requirements before switching routes. |
| Investment casting | The part is small, detailed, and repeated at production volume. | Larger casting geometry and tolerance expectations fit investment casting better. | Compare size, surface, tolerance, finishing, and inspection needs. |
| Stamping | The part needs 3D features, thickness, or integrated functional geometry. | A flat sheet-metal form already works well. | Avoid forcing MIM into flat part applications. |
| Metal 3D printing | The design is moving from prototype to repeat production. | The project is still in early prototype validation. | Use additive manufacturing for iteration, then review MIM for production intent. |
What Drawing Details Are Needed for a Reliable MIM Suitability Review?
A suitability checklist becomes much more useful when the user provides enough project information. A 3D model alone is not enough. Engineers need to understand what the part must do, which dimensions are critical, what material performance is required, and why the current manufacturing route is being reviewed.
2D Drawing and 3D CAD File
The 3D CAD model helps review geometry, molding direction, feature access, wall transitions, undercuts, and potential tooling complexity. The 2D drawing shows tolerances, datums, critical dimensions, surface finish notes, thread requirements, and inspection expectations. Both are useful because MIM suitability depends on both shape and function.
Material or Performance Requirement
If the material grade is known, it should be provided. If not, the user should provide performance requirements such as strength, hardness, corrosion resistance, wear resistance, magnetic properties, heat exposure, or regulatory constraints. A material name without application context may lead to poor selection.
Critical Dimensions and Tolerance Zones
Not every dimension has the same functional importance. A good MIM review should separate critical dimensions, assembly interfaces, datum features, sealing surfaces, threads, bearing zones, sliding areas, and cosmetic surfaces. This helps decide what can remain as-sintered and what may need secondary machining or inspection control.
Estimated Annual Volume and Project Life
Tooling and process development depend on production demand. Estimated annual volume, project life, ramp-up plan, and repeat order expectations help determine whether MIM is commercially reasonable. If demand is uncertain, the engineering team may still review the part, but tooling decisions should remain cautious.
Current Process and Manufacturing Pain Point
Users should explain whether the part is currently machined, cast, stamped, assembled from multiple pieces, printed, or not yet produced. The current pain point may be cost, burrs, lead time, tolerance variation, assembly complexity, material waste, or scalability.
Application Environment and Inspection Expectations
Operating environment affects material and process review. Engineers should know whether the part will face load, sliding wear, corrosion, heat, magnetic function, fluid contact, cosmetic surface requirements, or safety-related inspection. Inspection expectations should be discussed before tooling, not after first samples are already made.
| Information to Provide | Why It Matters | What Happens If It Is Missing |
|---|---|---|
| 2D drawing | Shows tolerances, datums, critical dimensions, and notes. | Tolerance and inspection risk cannot be reviewed properly. |
| 3D CAD file | Shows geometry, feature direction, wall transitions, and moldability. | Tooling and DFM review remain incomplete. |
| Material grade or performance target | Guides material family and process feasibility. | Material selection becomes guesswork. |
| Estimated annual volume | Helps judge tooling justification. | Cost comparison may be misleading. |
| Current manufacturing process | Shows why MIM is being considered. | The real conversion value may be unclear. |
| Critical dimensions | Helps separate as-sintered and post-machined areas. | Unnecessary tight control may increase cost. |
| Surface finish or coating needs | Affects secondary operations and quality planning. | Finishing cost or risk may be underestimated. |
| Application environment | Supports material, inspection, and risk review. | The part may be evaluated without functional context. |
For direct engineering review, use submit drawing for review. If your project already has drawings, material requirements and estimated volume, you can also request a quote.
What Happens After a Part Passes the Suitability Checklist?
Passing the checklist does not mean the part is ready for tooling. It means the project is worth deeper engineering review. The next step should narrow the risks before cost, lead time, tooling, and sampling are discussed in detail.
Move from Suitability Screening to DFM Review
DFM review checks whether the geometry can be molded, ejected, debound, sintered, supported, and inspected. It also identifies design changes that should be made before tooling.
Confirm Material and Performance Targets
Material review should confirm whether the required properties can be supported by a practical MIM material route, heat treatment, surface finishing, and inspection plan.
Review Tolerance and Shrinkage Risk
Tolerance review should identify critical dimensions, datums, shrinkage-sensitive areas, expected secondary machining, and inspection strategy.
Discuss Tooling, Sampling, and Inspection Planning
The engineering team should review parting line, gate location, ejection, sintering support, sampling strategy, first-article inspection, and possible correction loops.
A useful RFQ should include drawings, CAD files, material or performance requirements, tolerances, surface finish requirements, annual volume, current process, and application background. Better information usually leads to a more reliable feasibility review.
Before You Contact Us: Prepare These Review Inputs
For a reliable MIM suitability review, please prepare enough engineering context before requesting quotation. This helps separate a realistic MIM candidate from a project that needs design change, material clarification, tolerance review, or another manufacturing route.
Drawing and CAD Data
Send 2D drawings, 3D CAD files, critical dimensions, datum requirements, surface finish notes, and thread or assembly interface details.
Material and Function
Provide material grade if known, or explain strength, hardness, wear, corrosion, magnetic, heat, or application performance requirements.
Volume and Process Background
Share estimated annual volume, project life, current manufacturing route, current pain point, target production timing, and application environment.
FAQ: MIM Suitability Before RFQ
How do I know if my part is suitable for MIM?
A part is usually worth reviewing for MIM when it is compact, geometrically complex, requires engineering metal performance, has stable production demand, and has a clear manufacturing pain point such as high CNC cost, assembly complexity, burr issues, or repeatability problems.
Is MIM suitable for low-volume parts?
MIM is usually less suitable for prototype-only or very low-volume parts because tooling and process development must be justified. However, part complexity, current manufacturing cost, material, and expected project life can change the decision.
What part size is best for MIM?
MIM is commonly reviewed for small to medium metal components with complex features. Larger parts may still require review, but debinding, sintering shrinkage, support, distortion, and cost risks usually increase.
Is MIM better than CNC machining?
MIM may be better than CNC when repeated machining is expensive, geometry is complex, volume is stable, and only selected areas need secondary machining. CNC may remain better for prototypes, low-volume parts, frequent design changes, or tight tolerance across many surfaces.
How do I know if my part is a better fit for MIM than CNC machining?
A part may be a better fit for MIM than CNC when it has small complex geometry, repeated production demand, multiple machining setups, high material waste, burr risk, or assembly reduction potential. CNC may remain better for prototypes, low-volume parts, large simple geometry, frequent design changes, or parts that require tight machining tolerance across most surfaces.
Can MIM hold tight tolerances?
MIM can support precision metal parts, but tolerance capability depends on material, geometry, shrinkage behavior, sintering support, part size, secondary machining, and inspection method. Critical dimensions should be reviewed before tooling.
What materials are commonly reviewed for MIM?
MIM projects are often reviewed around stainless steels, low-alloy steels, tool steels, magnetic alloys, and other engineering metal families depending on the supplier’s capability and application requirements. Final material choice should be confirmed through material selection review, performance requirements, and project validation.
What should I send for a MIM suitability review?
Send 2D drawings, 3D CAD files, material or performance targets, critical dimensions, tolerance requirements, surface finish needs, estimated annual volume, current process, and application background.
Submit Your Drawings for MIM Suitability Review
If your part has complex 3D geometry, high CNC machining cost, assembly reduction potential, stable repeat demand, or unclear material and tolerance risks, send the project for MIM suitability review before tooling.
Please provide 2D drawings, 3D CAD files, material or performance requirements, critical tolerances, surface finish needs, estimated annual volume, current manufacturing process, and application background. XTMIM’s engineering team can review whether the part is a realistic MIM candidate, which features may require DFM adjustment, whether material and tolerance expectations are practical, and what risks should be confirmed before tooling, sampling, or production planning.
Contact XTMIM Engineering Team Submit Drawing for ReviewEngineering Review Note and Technical References
This checklist is an early-stage engineering screen. It does not replace project-specific DFM review, material confirmation, tooling review, sintering risk analysis, tolerance planning, sampling, or inspection validation. Final MIM feasibility depends on the actual drawing, material, geometry, part size, wall balance, critical dimensions, secondary operations, production volume, and application environment.
MIMA’s design guidance is relevant to this page because it frames MIM candidate review around shape complexity, manufacturability, production quantity, material performance, and component cost rather than a simple material-name decision. It supports early suitability screening, but it does not replace drawing-specific DFM review. MIMA Designing with MIM
MPIF Standard 35-MIM is relevant for material discussions because MPIF describes it as covering common materials used in metal injection molding, with explanatory notes and definitions. It can guide material specification discussions, but final material choice still depends on application requirements, supplier capability, heat treatment, finishing, and validation. MPIF Standards
EPMA’s MIM overview is useful for process context because it explains the relationship between conventional press-and-sinter PM and MIM, including the role of injection molding, binder removal, sintering shrinkage, and the geometry limitations of uniaxial pressing. This supports the page’s process-boundary discussion between MIM and alternative routes. EPMA Metal Injection Moulding overview
ASM Handbook material on designing for metal powder injection molding is relevant because it discusses MIM evaluation criteria such as production quantity, shape complexity, material performance, cost, surface finish, component size, mass range, holes, undercuts, and flat faces. It supports the engineering logic behind candidate screening and process selection. ASM Handbook reference