For easier finding of keys in a pocket or for faster key retrieval.

Original Prusa i3 MK3S+:

Nozzle: 0.4 mm
Fill: 0%
Layer height: 0.2 mm
Perimeters: 2

I'm including the option to print in Multicolor MMU.

You can split the parts using 'Split - To objects' and print each color separately, and then glue the model together. It's possible to hang it on the wall without the top ring.