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I use Makerbot Replicator to make all types of prototypes. My friends were driving me crazy asking for these toys. Took Fusion 360 to quickly design this fidget spinner, there are five 3/8 inch balls and one skate bearing. The skate bearing had the retaining clip removed and the grease removed with acetone. This version has a wonderful feel to it. Used the 3/8 balls for weight, and the balls ride in a race so that they can spin when you run your fingers over them.