Is it only me?
I do not know what to do with my fingers. I always need something to play around with. And I always feel the urge to design and print things. Why not just combine both habits?

This is a print-in-place threaded nut & bolt fidget toy. Just rotate the inner ring to let it go up, then rotated in the other direction to let it go down... OK, you all know how a thread works.

The print can be challenging as it has some overhangs inside the the ring that are hard to be cooled. The ring also lays with one single line on the bolt. I fine-tuned the model and the settings for two printers (Anycubic I3 Mega and Bambu Lab P1S) and did a lot of test-prints with different PLA brands: Sunlu Meta PLA, Sunlu PLA+, Eryone PLA, Voxelab PLA and 3D Jake Eco PLA.
For all prints I used the generic PLA filament settings.

Print it slowly, no need to hurry. Use a layer height of 0.16mm. 0.2mm layers do also work but then the overhangs are not so nice. Use 3 walls, 5 tops, 4 bottoms, 8% gyroid infill and no supports.
Set the speeds to 60mm/s outer, 120mm/s inner, 60mm/s tops and 200mm/s for all infills. My logo will not be visible on single-colour prints. This print should take about 100min on a P1S and 180min on a I3 Mega.
If you want you can go full colour and split the STL into its single parts. Choose different colours for the bolt, the ring and the logo. If you do not like my logo just choose the same colour / material for it as the bolt has. The logo will then vanish after slicing. A multicolour print needs about 5.5 hours.

After the print twist the ring with a little force. This will break the one single line touching the bolt and you can play around with your new fidget toy.

Disclaimer:This work by blecheimer is licensed under CC BY-NC-SA 4.0.You are not allowed to copy this model to other 3D printing websites without my permission.