The "Injection Molding Part Design for Dummies" guide is a specialized resource often distributed by industry experts like Protolabs. It breaks down complex manufacturing principles into actionable rules for beginners. Core Design Principles
Conclusion
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Sink Marks: Shallow depressions caused by thicker areas shrinking more than thinner ones. The "Injection Molding Part Design for Dummies" guide
: Sharp corners are "stress concentrators" that make parts brittle. Adding a radius (rounding the corners) improves material flow and significantly increases part strength. A good rule of thumb is an inside radius of at least 50% of the wall thickness. Ribs for Strength Injection Molding Handbook by James P