E-Bike Caleidoscopic Key Ring

Printing and Assembly
I printed this model on a Prusa Mini, 0.2 mm layer height.
Printing time is about 1 hour.
Flip one of the concentric wheels 180 degrees before assembly.
If you want two-color wheels, use Rims.stl and Tires.stl in stead of Wheels.stl.
The frame halves press fit, or can be glued.
 

Operation
Turn the two concentric wheels clock-wise and anti-clockwise (thumb and index finger) to see the caleidoscopic effect.