Key principles.
Edge / hidden
On edge or hidden surface. Avoid cosmetic faces.
Toward parting line
Draft tapers away from parting line for ejection.
1-2° standard
1° smooth surfaces. 2-5° textured.
Engineer review
Tooling engineer reviews part for parting+draft optimization.
Avoid undercut
Undercut features need side actions (premium tooling).
Avoids parting
Sometimes two-piece molded + assembled cheaper than complex tooling.
FAQ
All vertical surfaces draft away from parting line. Visualize ejection direction.
Side actions enable. But adds 30-100% to mold cost. Evaluate cost vs benefit.
Textured surfaces need more draft (3-5°) than smooth (1-2°). Per texture depth.
Yes — early in design. Identify difficult features. Suggest design changes.
Mold flow analysis predicts fill patterns. Helps optimize parting line position.
For complex undercut features, sometimes cheaper to mold two pieces and assemble.
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