Earlier quoted context omitted.
Would you consider the parts you made foodsafe? Or would you have to use the parts to make a mold, then produce foodsafe parts? The nooks and crannies in 3d printed plastic, plus the less controlled melting/cooling has concerned me for making something which is food safe. Mostly the concern about places for bacteria to hide on the parts.
It also depends on what you are doing. If they are single-use, they can be made food-safe pretty easily, even with the nooks and crannies. With 3d printing, it can be pretty cheap to do single-use stuff. You can also electro-plate them with silver and have a pretty sanitary part.
You can electro-plate thermoplastic?