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You need enough ejection force to overcome the shrinkage friction (approx. 10% of clamping force). Increase pin diameter if the plastic is soft (TPU, silicone).
: Avoid sharp internal corners. Use generous radii to improve material flow and reduce stress concentrations. : Design vents between 0.01–0.05 mm injection mold design guide
: This is the "golden rule." Constant wall thickness ensures even cooling and reduces the risk of sink marks , internal voids, and warping. Recommended Range : Generally between , though parts can be as thin as for specific resins. You need enough ejection force to overcome the
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