The wax will be encased in a sort of plaster called “investment”. Once the investment hardens, the wax is melted out, leaving a negative copy of the part behind.
That investment (call it a big lump of plaster, inside a can that’s open on both ends) will then be fired in a kiln, curing it. Once cured, but with the investment still at high temperature, the molten metal is poured in.
After the metal cools, the investment is broken away and the part (now cast in metal) is cleaned and polished.
So tmfrom start to finish, this goes from:
– 3D print (positive)
– Rubber (negative)
– Wax (positive)
– Investment (negative)
– Metal (positive)