Injection Molding 101: Undercuts

Undercuts are items that interfere with the removal of either half of the mold. Undercuts can appear just about anywhere in the design. These are just as unacceptable, if not worse than a lack of a draft angle on the part. However, some undercuts are necessary and/or unavoidable. In those instances, necessary undercuts are produced by sliding/moving parts in the mold. Keep in mind that creating undercuts is more costly when producing the mold and should be kept to a minimum.
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