Cat Toy

Important notice: make sure the material you print this is not toxic for your pets!!
I designed this as a simple toy for my cats. The inner smaller ball guarantees some noise during the rotation that the cats like very much.
The inner ball is truncated, to allow it to be printed on standard filament printers without hassles. I doubt your cat will complain that it is not a perfect sphere!
Please orient the Y axis upwards on your slicer before slicing.