4-Arm Ball Bearing Fidget Spinner
thingiverse
I imported the design from Dorikin350z into Tinkercad, copied it, and spun the copy 90 degrees to transform a 2-arm spinner into a 4-arm one. I also very slightly enlarged the bearing opening; the ceramic bearing in my printed model still fits snugly but doesn't appear to be at risk of over-stressing the spinner body. This design requires one skateboard-sized bearing and four 5/8" ball bearings. The picture features bearing buttons created from a design on Thingiverse with the number 1866001. My finished spinner works well, with plenty of weight to it and a nicely balanced feel while rotating. I made this thing using Tinkercad. Edit it online at https://www.tinkercad.com/things/2f0VQ7VQVwS
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