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A CAD model can be manufacturable by one process and impractical by another. To judge whether yours can be made, first specify the process, material, production volume, tolerances, finish, tooling and quality requirements. Then check the geometry against that process and have a manufacturing partner review any unresolved risks before you commit to tooling or production.
Define what “manufacturable” means for your part
Manufacturability is a fit between a design and a production scenario—not a pass-or-fail property of a CAD file by itself. The same geometry may be straightforward to machine but costly to mold, or suitable for one supplier’s equipment but not another’s. Design for manufacturing (DFM) evaluates the process, material, geometry, tolerances, tooling, volume and quality expectations together. Boothroyd Dewhurst’s DFM overview explains this broader approach.
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Before reviewing geometry, write down the assumptions a supplier would need to assess the design:
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- Process: for example, CNC machining, injection molding or sheet-metal fabrication.
- Material: include the specific grade when it affects performance or availability.
- Production volume: a process that makes sense for a small run may not suit a large one.
- Critical dimensions and tolerances: identify which dimensions affect function rather than applying tight tolerances everywhere.
- Surface finish and quality criteria: say what must be measured or inspected and what finish is acceptable.
- Tooling and secondary operations: note whether the design allows for them and whether they are acceptable.
These inputs let you compare realistic options. A DFM review for one process does not establish that the same part will work in another.
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Screen the design against the chosen process
Use a checklist for the intended process as an early screen, not as a guarantee. Boothroyd Dewhurst’s ungated DFM checklist covers CNC machining, injection molding, sheet metal, die casting, forging, investment casting, extrusion and PCB design.
CNC machining
- Check that cutting tools can reach each feature, including deep pockets and internal geometry.
- Review internal corner radii, pocket proportions, setups and fixturing. Features that require extra setups or specialized tools can add cost or complexity.
- Confirm the requested tolerances and surface finish are necessary for the part’s function and compatible with the material and supplier’s capabilities.
Boothroyd Dewhurst gives an internal corner radius of at least three times the depth as a rule of thumb that can allow standard end mills. It is not a universal specification: validate the geometry with the chosen tool, material, supplier and functional requirements.
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Injection molding
- Look for consistent wall thickness, suitable draft, and geometry that can be released from the mold.
- Review undercuts, ribs, gate location and ejection. These choices affect tooling and whether the part can be molded as intended.
The checklist suggests uniform wall thickness within a ±10% variation target and draft angles of at least 1 degree. It also describes draft of 1–2 degrees per side as typical. These are engineering rules of thumb, not guarantees; the right values depend on the plastic, part geometry, mold and supplier.
Sheet metal
- Check bend radii against the material and stock gauge, and verify hole-to-edge spacing near bends.
- Review the flat pattern, nesting and bend sequence, not only the folded 3D model.
Boothroyd Dewhurst suggests a bend radius at least equal to the material thickness and hole-to-edge spacing at least twice the material thickness as rules of thumb. Confirm both with the selected material, gauge, fabrication process and supplier.
Make tolerances and finish earn their place
Every tight tolerance or demanding finish should correspond to a functional need. If a dimension does not affect fit, motion, sealing or another defined requirement, specifying unnecessary precision can require additional operations and inspection. Separate critical dimensions from those that can use a more ordinary manufacturing tolerance, and tell the supplier why the critical ones matter.
Use the intended production volume when weighing process options. Compare material and performance needs, feature access, tolerance and finish requirements, tooling and secondary-operation burden, inspection needs and supplier capability. A technically possible process may not be the practical choice for the quantity and quality level you need.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use CAD feedback as a scoped check, not certification
Automated analysis can help identify issues within the process and assumptions it supports. Autodesk Fusion’s Design Advice, for example, checks injection-molding concerns for a selected solid body and pull direction, using plastic rules associated with the component or a default rule. Autodesk documents it as part of Fusion’s Design Extension; check current availability and licensing before relying on the feature. Read Autodesk’s Fusion Design Advice documentation.
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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →A result from a molding-oriented tool does not verify CNC or sheet-metal feasibility, nor does it establish that a supplier can meet your tolerances, finish or inspection requirements. Treat any automated findings as prompts to investigate, not as production approval.
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Get supplier review before committing to production
For a real part—especially one with tooling costs, tight tolerances, uncertain process selection or significant quality requirements—ask a qualified manufacturing partner to review it before tooling or production commitments. Provide the authoritative CAD model, relevant drawings or specifications, material, tolerances and intended production context. Ask the supplier to identify assumptions and open issues, and make sure the review reflects that supplier’s equipment and process.
A checklist can expose common risks, and software can flag concerns within its scope; neither guarantees successful production. The supplier review is where process-specific constraints and unresolved questions can be addressed against the actual manufacturing plan.
Further reading
For a deeper treatment of design for manufacture and assembly, Boothroyd Dewhurst identifies Product Design for Manufacture and Assembly by Boothroyd, Dewhurst and Knight as a relevant textbook. Check the publisher or bookseller for the current edition and availability.
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