I was looking a various fidgets and found one that is typically made out of chain links and key ring rings. I couldn't find anyone had designed on to print so thought I would give it a crack. Quite pleased it worked first iteration. It is quite strong as the rings are printed in a long cross section. I have also included the gcode that worked for me on both my Original Prusa i3 MII and my CR10. Both PLA. The Prusa is at .08 layer height and takes about 2hrs to print. The CR 10 gcode is .15 layer height and takes about 1 hour, only uses 20 cents plastic. Here is a link to how they work https://www.youtube.com/watch?v=0Zt1AdacyJM