Do you need a keyring but you forgot to buy one? No problem, just print it!
There are 3 sizes:
Material: PLA
Layer height: 0.2 mm
Wall generator: Arachne
Perimeters: 3
Top layers: 3 layers
Bottom layers: 3 layers
Top/Bottom Surface Pattern: Concentric
Infill: doesn't matter, it's just perimeters
Supports: no
Check out a key holder I made here.