Design guide
Injection molding design guide
Draft, wall thickness, ribs, bosses, and gate placement, plus what each one costs you in tooling if you get it wrong.
What is in it
- Draft and wall thickness, the pair that decides whether a part fills cleanly and ejects at all
- Ribs and bosses proportioned to keep sink, voids, and warp out of the finished part
- Gate placement, and what moving one costs you once the tool has been cut
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The whole guide is in the PDF. We are laying these out to read properly in the browser, the way the reference charts already do; until that lands, the file is the guide.
