I was inspired by Dorikin350z Ball Bearing Fidget Spinner.
Wouldn’t it be nice to use Neodym magnet balls which also can spin in their housing and influence each other ?
The modification allows with a little pressure to snap the balls into their housing.
Don’t use any glue, because they rotate freely.
Rotate one ball and the others will follow because of the magnetic field.
Magnet Ball diameter: 12,7 mm
Magnet Ball diameter: 15 mm
“Skate” bearing diameter 22 mm
If the balls do not slide with light pressure in their housing, take a hair dryer and heat the housing. But be careful, 1, 2, 3 seconds are sufficient.