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Most fidget spinners are designed with the intention of having the longest spin time. however, the piston spinner was designed to have as many fidget features as possible! Unlike any other fidget spinner, this one has two pistons that move in and out while you spin! This spinner may appear to be quite bulky, however I can assure you that it fits in my average sized 14 year old hands. I wanted to make my own unique fidget spinner, not just any old fidget spinner. It had to be something original that had more fidgeting applications than just spinning. For this build you'll only need a couple things: Four 608 22mm ball bearings, and access to any 3D printer. For the separated STL files you can check out my full Instructable here: https://www.instructables.com/id/Piston-Fidget-Spinner/