Injection Molding DFM Checklist for Prototype Molds
Use this injection molding DFM checklist before ordering prototype molds or low-volume injection molded parts.
Injection molding DFM should check wall thickness, draft, ribs, bosses, undercuts, gate location, ejector marks, material shrinkage, texture, tolerance, and T1 sample acceptance before mold cutting starts.
Run DFM before cutting steel or aluminum
Mold changes are expensive after cutting starts. DFM should happen before tool build so the design can be adjusted while changes are still cheap.
- ✓Check draft and undercuts.
- ✓Confirm wall thickness.
- ✓Review gate and ejector marks.
Prototype mold vs production mold
Prototype molds help validate design and early quantity. Production molds are built for longer life and repeatability. Choose based on quantity, material, and validation stage.
- ✓Prototype mold for validation.
- ✓Bridge tooling for early sales or pilots.
- ✓Production mold after design freeze.
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FAQ
When should DFM happen?
Before mold cutting. DFM after cutting is slower and more expensive.
What is T1?
T1 is the first mold sample run. Buyers should review dimensions, cosmetic issues, material behavior, and assembly fit.
Can low-volume molding start with prototype tooling?
Yes. Prototype or bridge tooling can support validation and early production depending on material and quantity.