After printing a few spinning gears and ball bearings, I thought why not combine them together to make a toy? The gear part was then modified to look like a saw blade so it looks meaner. Not really sure if this classifies as a toy, but I've used them as coasters before and they worked great!This thing is easy to print. Everything is printed in one go, and then you just have to remove the raft and supports. Give the balls a bit of cleaning and pushing, then they'll get loose eventually. I printed these on UP Plus 3D printer. 0.2mm - 0.3mm Z resolution. Speed: Normal or Fast.