Yes. But I'm talking about reproducing a part by making a rubber mold then mixing the plastic pour at this point.Idea is to reproduce a part as exactly as We could.My example is parts from a 1950's shelf. Easier to Cast a mold then pour it the do a 3D model.
Sounds like molds for lost wax casting used to make jewelry. I also tinker with lapidary hand make silver rings and pendants for the wife and myself lol.