Why

I sleep on my side and only use a single ear plug. Used to put one in my wallet, and now I have this tiny container for it.

You can also use it for other small things like medication, a secret note, a 0.01 nozzle printed statue of your mother, etc.

Qualities

It's small, but with relatively thick wall and rounded curves, so I expect this to be quite sturdy and survive my wallet.

I added a small ‘handle’ you can use to attach it to a wire. It's a bit small, but can add one with larger hole on request. 

Printing

- The thread of the screw is big and there is a bit of clearance between cap and thread, should be an easy fit.
- I printed it with variable layer height to speed things up.