Summary
A manufacturable injection mold design follows four principles: uniform wall thickness to avoid sink marks, draft angle on every vertical surface, a parting line placed on a flat or low-visibility area, and a cooling layout that balances flow across the cavity. A 40-point DFM check before steel is cut prevents most field defects.
Key specifications
| DFM checklist items | 40 points across geometry, gating and cooling |
|---|---|
| Minimum draft angle | 1 degree, 2 degrees on textured surfaces |
| Typical wall thickness | 1.0 - 3.5 mm depending on resin |
| Shrinkage compensation | 0.3% - 2.0% by material |