gyroscope
There are several on the net but I like to redesign them with Freecad and put the dimensions that I like.
This set of rings that rotate ...one inside another can be classified as an anti-stress object. Especially for people who need to be doing something by hand.
I put 2 versions, one with 3 rings and another with 4. Either of them can be held with the index fingers and thumb of one hand and hit, with the index finger, the other hand, one of the inner rings. See how they turn is very relaxing!
3d model print parameters
PLA
with wall thickness of 1 mm and 0% infill.
-0.1 horizontal expansion
Once the piece is printed, the joints work perfectly without any post-pr...ocessing.
Optionally, you can put a little fat with a toothpick on the joints so that they still rotate longer