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Plastic warpage is rarely caused by one thing. Material, cooling, tooling and geometry all play a role. Still, plastic part design can make the problem much better or much worse.
Keep Wall Thickness Consistent
Large changes in section thickness can cool at different rates and create uneven shrinkage. Smooth transitions are usually easier to manage.
Be Careful With Ribs and Bosses
Thick ribs and bosses connected to thin walls can create local mass concentrations. Use geometry that provides stiffness without creating unnecessarily thick sections.
Think About the Mold
Parting line, cooling channels and ejection strategy influence the final result. A CAD model should be reviewed with tooling direction in mind.
Material Matters
Different plastics have different shrinkage and processing behaviour. Do not transfer one design rule blindly from one resin to another.
Best Practice
Get DFM feedback before tooling. Changing a CAD wall or rib before a mold is cut is much easier than modifying a finished tool.
Keep learning: Explore more practical engineering articles in the GetCADFile Design Guide.