It is the process of creating copies of thermoset plastic parts. Traditionally, it starts with a CAD file for generating a 3D printed, or machined, master pattern. The pattern instead, is used for creating a silicone mold. The mold is ultimately used to make copies of the master pattern by injecting liquid plastic into the mold. Once the liquid plastic is cured, the part is extracted from the mold and the process is repeated. This process compares to injection molding in that it uses a silicone mold instead of a metal mold. It is also faster and the costs are much lower. There is, however, a limited number of times that the mold can be used before it fails.