This is a protective case for Shiftcrypto's Bitcoin hardware wallet BitBox01 (Digital Bitbox).
It protects the wallet itself from scratches and especially the USB connector when you store it in your pocket or bag, for example.
I will post a similar thing for the BitBox02 soon!
PS: I'm not employed or affiliated with the company, I just like their products.
You will probably need a few tries with the lid. It is already designed with a decent gap between it and the slot in the box, but since my printer is over extruding a bit, I had to print it at 95% size in the X direction (when orienting the lid so that the short side faces you). The lid is very fast to print, like 10 minutes so just try a few X direction multipliers (90, 95, 100, maybe 105), it really depends on your printer and settings!