This keychain is designed by gianfranco and can be downloaded from Thingiverse from this link: https://www.thingiverse.com/thing:1307100
When printed, every single ring is suppose to be a seperate piece, and since it has a curve to it, they cant fall out of etchothers shape. 
Fun keychain to play with, kinda like a "fidget-thingy" :)
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