Uneven wall thickness can cause different cooling rates across a plastic part. Thicker sections generally take longer to cool than thinner areas. This condition may lead to defects such as sink marks, internal voids, or part deformation after ejection. Product designs should therefore maintain reasonably consistent wall thickness according to the material and intended function.

Where additional strength is required, supporting features such as ribs may be considered instead of making the entire section thicker. This approach helps balance structural strength and cooling behavior. During injection-molded product development, wall thickness should be evaluated before mold manufacturing begins to reduce the risk of defects at an early stage.

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