A set of key sleeves that fit 24mm diameter keys. I printed the sleeves from TPU to keep them from cluttering in a pocket or purse. They also come in various shapes to help you identify the key in the lock in the dark. They can be printed in a variety of colors.

I printed the sleeve from TPU because it fits well. The sleeve is quite tight, so I don't recommend printing it from PLA or other stiff materials. The key may simply not fit into the sleeve. Droplet 0.2mm

You can also print them from fluorescent material, which will certainly help you find your keys in the dark and recognize the dedicated key.