Injection Molding Design for Manufacturability (DFM)

Typical applications

• New part designs moving from prototype to production tooling
• Designs being re-evaluated for cost reduction
• Parts transferring from another molder where the original design intent is unclear

Process overview

1. 1

   Wall thickness review

   Checked for uniformity and target range for the selected resin to control sink, warp, and cycle time.

2. 2

   Draft & texture check

   Draft angle is matched to wall height and any specified surface texture.

3. 3

   Rib and boss review

   Rib thickness relative to nominal wall is checked to avoid sink on cosmetic surfaces.

4. 4

   Gate and parting line proposal

   Gate location is proposed based on fill pattern, cosmetic requirements, and part function.

Part design considerations

• Wall thickness: aim for uniform sections; thick sections cause sink, warp, and longer cycle times
• Draft: typically 0.5–2° minimum per side depending on wall height and texture
• Ribs: generally 50–60% of nominal wall thickness to avoid sink-through on the opposite face
• Radii: internal and external corners should carry radius to reduce stress concentration and improve fill

DFM guidance

• Bring us the model early — DFM feedback before quoting is free; DFM feedback after tooling is cut is a change order
• Tell us the cosmetic priority surfaces so gate and knit-line placement can avoid them
• If a design rule can't be met (e.g., a required thick boss), we'll tell you the tradeoff — sink risk, longer cycle time, or a design change — rather than silently molding it and hoping

Quality controls

• DFM findings documented and shared with the customer before tool build begins
• First-article inspection validates the as-molded part against the reviewed design

Secondary operations available

Frequently asked questions