I've seen: 3d print a part (resin printer), make a mold from the 3d printed part with modeling clay or whatever, cast wax in the mold and then sand cast metal w

I've seen: 3d print a part (resin printer), make a mold from the 3d printed part with modeling clay or whatever, cast wax in the mold and then sand cast metal with the wax casting. I think the 3d printed part wouldn't burn away as cleanly as the wax that is designed for that purpose. Probably faster if you want more than one as well.