I wanted some containers for dice, so I printed some different kinds of caps to go on the ends of the transparent tubes you buy at a hardware store for transporting fluorescent light tubes (about $3-$4 USD now in 2019).
Cut a section of tube, smooth the ends, and add caps. You can also do what I did and add elastic cord to keep the caps on. There are designs for cords to go outside the container and other designs for the cords to go inside.
All caps are designed to print without supports, but YMMV.
My transparent tubes also came with two black end caps. to make them more usable I designed and printed some discs that can be jammed and glued in them.
I don't have separate .f3d files for most of the variants of the caps, but if you're interested you can scroll back through the history (wait, can you?) and maybe reconstruct them.