You have a brilliant product idea. A plastic clip, a housing for an electronic device, or a custom gear. You draw it in CAD, send it to a mold shop, and wait eight weeks. The mold arrives—but the parts warp, sink, or crack.
Production stopping entirely because a part refuses to leave the mold. Draft Angle Cheat Sheet Minimum Draft: 0.5 degrees on all vertical faces. Standard Practice: 1.0 to 2.0 degrees for nominal walls.
Your rule of thumb: A good starting point is an inside radius equal to half the material thickness (0.5 x T).
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Plastic shrinks as it cools. Liquid resin takes up more volume than solid resin. Amorphous plastics (like ABS or Polycarbonate) shrink less, typically around 0.5%. Semi-crystalline plastics (like Nylon or Polypropylene) shrink significantly more, sometimes up to 3%. Managing this shrinkage is the core objective of part design. 2. Wall Thickness: The Golden Rule injection molding part design for dummiespdf exclusive
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5. Rule #4: Use Radii and Fillets to Eliminate Sharp Corners
(like ABS) are different from flexible materials (like TPE). You have a brilliant product idea
Every inch of depth, add at least 1° of draft. 3. Ribs: Adding Strength Without Thickness
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Like ribs, the wall thickness of a boss should not exceed 60% of the main wall thickness.
Apply a minimum draft angle of 1.5 to 2 degrees to all vertical faces parallel to the direction of the mold opening. The mold arrives—but the parts warp, sink, or crack
: Apply a minimum of 0.5 degrees on all vertical faces.
Follow these design guidelines to create injection molded parts:
I can provide targeted advice or calculate optimal wall and rib dimensions for your exact application. Share public link