This is my double pendulum fidget spinner. I made this so it would be easily held and played with in one hand. Since its a double pendulum it makes chaotic motions however you move it. I used 1x 608 bearing and 2x 624 bearings. This spinner works best with full ceramic bearings or fully cleaned steel bearings. You can see it working here.
If you don't have a 3d printer but still want my design please consider checking out my etsy.
Monoprice Maker Select Plus
Print 2 of the Large Arm files. The Caps sit almost flush with the hole for the 608 bearing so use that as a guide when aligning the 2 halves.