What better way to pass the time while you're waiting around with your keys than with a fidget toy!  

This is a simple print-in-place model, and no supports or brim should be required.  Note that if you want to use a regular key ring with this model (such as is shown in the pictures), you'll want to use a larger version (at least 3 cm in diameter) - as smaller versions will be hard to attach.

I designed this model from scratch for the key tag competition here on printables, but I'm noting this as a remix of NicoConex's cool gear fidget from which I gained some inspiration.  And a big thank you to Krumps for the above animation!