Below is some basic terminology relating to injection molds.

Example injection mold - terminology

There are a number of different ways you can make a mold:

Machine the mold entirely from metal.

Tensile test bar mold and dogbone part.

Machine a pocket into a metal mold and then place a 3D printed insert into the machined pocket.

Prototype mold for overmolding wires.

3D print a mold to fit inside an aluminum master mold frame.

3D printed gasket mold in aluminum master mold frame.

3D print a stand alone mold.

3D printed mold and molded part with recycle insignia.