3D printing stuff that's foodsafe is nontrivial. You not only need a material that is not directly harmful (in temperatures it will be used in), but also most 3

3D printing stuff that's foodsafe is nontrivial. You not only need a material that is not directly harmful (in temperatures it will be used in), but also most 3d printed surfaces will not be smooth. This makes them very hard to properly clean (especially the parts of such a cup that wouldn't be reachable), which causes biological problems (bacteria and mold growing there). Whatever material such a cup was made out of, I'd've wanted to be able to dismantle it for cleaning, which lessens the advantage of 3d printing over more traditional fabrication techniques.