1. Warping — uneven cooling → balance mold temperature
2. Sink marks — insufficient packing → increase hold pressure/time
3. Flash — low clamp force or mold fit → increase tonnage or repair parting line
4. Short shot — low injection speed or material temp → increase both
5. Weld lines — cold melt front → increase mold temp and injection speed

Full guide: https://www.mfgabc.com/guides/injection-molding-defects-guide.html

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