I keep making these to give away at talks, work, and other events where I get to be excited about 3D printing. I have easily made at least 200 in all colours and sizes, mostly the 50mm one because it's the fastest and I can do them easily in bulk.
I particularly like these containers because they are useful (can store stuff in them) and because the threads illustrate how 3D printers can produce such fine detail.
Even after giving away 200 of these, I have never, not even once, had somebody say anything other than, "Oh this is perfect for keeping drugs in!" It's the only joke people make now and it's so predictable. It's a real hit!
If I want to be extra sure these will print fine, I usually add a brim.