Elastomer intensifiers for part manufacture and methods of making elastomeric intensifiers are described herein. An example method of fabricating an intensifier includes: add a mixture to a region of a mold, the mixture including a first amount of an elastomer and a constituent; curing the mixture to form an insert having a shape corresponding to the region of the mold; adding a second amount of the elastomer to the mold and over the insert; and curing the insert and the second amount of the elastomer to form the intensifier.