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DFM and injection molding

DFM (Design for Manufacturing) is about shaping parts so they are simple and cheap to produce. For injection-molded parts this usually means uniform wall thickness, which avoids sink marks and internal stresses since thick sections cool more slowly, and a draft angle (typically 0.5–2°) so the part releases easily from the mold.

uniform wall thickness+draft angle 0.5–2∘\text{uniform wall thickness} + \text{draft angle } 0.5\text{–}2^\circtwo basic rules for injection-molded parts

Example

A wall with varying thickness can get sink marks where it is thickest — the fix is to keep the wall thickness as uniform as possible.

Set tight tolerances only where function actually requires it — tighter tolerances mean higher cost.
Practise design for X and production for free →

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Part of Product Development: Design for X and production.