As smooth as Tennessee whiskey! I printed these in foodsafe PETG to use as a plastic cup. wanted to see it in colors but unfortunately i dont have a multicolor printer, so i handpainted one of them with acrilic paint and brush. I am very happy with the result and keeping the painted one on kmy desktop now. this will be a part of a more complex multipart design. for watertight print: 4 walls, 4 bottom layers, 4 top layers, 15% infill, Foodsafe PETG is strongly recommended if you plan to use it for drinking. Cheers!