Air Spinner

thingiverse

I'll admit that this is pretty much a fidget spinner, but just barely. My nephew discovered the whole Fidget Spinner + Air Compressor thing and promptly locked up all his bearings. This design uses a single skate bearing specifically, and of course, is spun by air. I might do a bigger version later to be set on a pole in the yard - that would need a "hat" to keep the bearing dry, depending on how quick he gets bored with this one. He thought the first version was cool so we did a second version with slightly canted arms. If you spin it up with an air compressor on a shaft, it will climb the shaft (theoretically - we are still printing it).