Designing For Moldability: Undercuts And Through-Holes

By Protolabs, Inc.

If your part design requires undercuts, consider side-action cams, bumpoffs, inserts, and other complex injection molding techniques Undercuts are those features in an injection-molded part that prevent its ejection from the mold. With straight-pull molds such as the ones used by Proto Labs, these are any protrusions, holes, cavities, or recessed areas in the part where alignment is not perpendicular to the mold’s parting line.