This is a simple fidget keychain. I designed it a while ago and it serves me well.
Be sure to fine tune your printer before printing. The two outer rings have a small gap. If you have problem with separating them you can try to print the last outer ring as a separate part.

Use change filament command in the middle of the print for fancier looking item.

My video about this keychain:

I designed it in Fusion 360 using the video “Patterning Concentric Spherical Shells” by Fusion 360 School - https://www.youtube.com/watch?v=xEVt508iopQ

It is my entry for Printables Contest: Last Meters
https://www.printables.com/pl/contest/70-last-meters
 

Happy printing!

Update 26.09.2023

Because some users are having problems with the print I modified the model slightly by adding a chamfer around the edges. It should help with the first layers being fused together. If you are still having problems with the print please view the video by 3dprintingworld
 

And this is my latest print using Fiberlogy PETG: