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Summary This is a "bearing" for fidget spinners. It was modeled to be the same size as the 608 bearings commonly used in fidget spinners. The center hole is 8mm, so you should still be able to use thumb pads. The outer diameter is 22mm and therefore should pop into any spinner you might want to put it in. Finally the "bearing" is 7mm tall. There are 3 different versions. A loose version (called "bearing"), a tighter version ("bearing-tighter"), and a version with 4 cutouts ("bearing-slots"). There is always room for improvement. Video: https://youtu.be/UMClVU6S02A Print Settings Printer Brand: Wanhao Printer: Wanhao Duplicator i3 V2 Rafts: No Supports: No Resolution: .2mm Infill: 50% Notes: Prints in one piece. Might have to use a thin bladed object to break it free. Post-Printing Break In & Lubrication It's a good idea to use the "bearing" as is for a few days to "break it in". Then, after a few days of breaking it, you can choose to lubricate it with WD40 or light oil. For a quicker break in, you can use compressed air to keep the spinner rotating for extended periods of time.