Ribs & Bosses
Both ribs and bosses are functional features in many plastic part designs. Ribs offer stability to side walls and standoffs such as bosses.
Bosses are used for screws or locators in assemblies. It is important that when incorporating these into your design to follow one simple guideline. Do not allow the rib or boss exceed 60% of the wall section of the mating surface of the part. Failure to head this design tip will result in sink marks on the adjacent face.From Website
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