Reinvented keyring

Reliable keyring for attaching your keys to your belt, backpack or anything else. Inserting the key requires only two moves, followed by a snap. The keys are safe and will not fall out. To unlock, twist the parts at the side diagonal cutout to swap places (as shown in the photo), so there will be a slot in the inner ring to allow you to remove the keys.
 

Printing without support, infill 15%, nozzle 0.4, layer 0.2. I recommend PLA+, regular PLA may be too brittle. The photo shows the item after six months of use.