What Should a DFM Review Actually Resolve?

The value of DFM is not a polished report. It is the early resolution of issues that affect manufacturing and acceptance. Typical topics include wall-thickness changes, undercuts, draft, parting lines, gates, ejection, sink and distortion risk, assembly clearance, and critical dimensions.

A useful DFM separates facts, assumptions, risks, and recommendations. Questions such as which surfaces are cosmetic, whether a gate mark is acceptable, and how a critical dimension will be measured require customer decisions. The manufacturer can recommend a direction, but cannot decide product function or final acceptance criteria on the customer's behalf.

The review should end with a traceable approval. If the product design changes later, the effect on tooling, schedule, cost, and samples should be reviewed again. This is far more reliable than trying to reconstruct verbal decisions after a mold trial.