Roller Fidgit

Inspired by the fidgit combined ball bearing and gimbal toy this one uses stepped roller bearings to get round the problem of printing balls.
Print in FINE - it is designed for a 0.18mm layer height.
Most of the rollers will come loose just by rotating the innermost circle, the few that don't can be persuaded using the slots or just nudged with a fine screwdriver.
A little lubricant woks wonders and makes it fly.
The openSCAD source has several tuneables and the gimbals and bearing race are easily separated and customised - enjoy!