Thanks! Yes, I made some different magnetic rings and balls, brought some of the balls to the IJA this year. I don’t think I was the first to make those, though. I have a box of 3d printed ring parts that are supposed to be fitted with magnets and attached to rings. I think I must have mentioned these before. I’m not so interested in pursuing that project right now, though.
Also used magnets on the balancing stick I made recently, for more than just connecting the parts, on the carbon fiber one uses a metal platform and a big magnet (of the same type as the biggest magnet displayed on the plate in this tutorial) Can be used for throw the platform itself on top of the stick while balanced.