What is the correct process to make a correct resin casting for jewelry? I have a 3D printer and I have printed some models with castable resin. When I burn one of these models in the oven and then do the metal casting, the surface of the metal piece is not smooth.

I did a test with a pan. I put a model of wax and a model of castable resin to heat in a pan, and the wax model melts, but the resin model don't.

The resin I have is the following:



What is the correct process to make a correct resin casting?

Thanks for your help.
Factually, the correct process is to heat up the mold hot enough to evaporate the positive. 

In investment casting the process to remove the wax or plastic positive is called the "Dewax" and "Burnout preheating".

The answer to your question depends on the material you use to generate a negative mold of the positive product. E.g. many silicate based materials require up to about 1100&nbsp;&deg;C to fully burnout all residue before pouring in the liquid metal.