Made these specifically to test Taulman 618 nylon watertightness and layer bonding. But they have useful finger grips and they look nice so I decided to share.
The regular and small tumblers get a really cool triangular tessellation pattern in stl form that looks awesome when printed. The smooth version is, uh, smoother.
About the nylon prints:
The big cup (smooth) is only 1 perimeter thick and as you can see in the pictures can be crushed without permanent damage. It is very flexible.
The small one is 3 perimeters thick and I can barely squeeze the opposing rims together. When I do, it still springs right back.
Print with zero infill and no top solid layers.