Steel Ball Fidget Spinner

thingiverse

This is designed to work with 5/8" steel balls; they should just pressure-fit snugly into the outer holes. The center accepts an R188 bearing for optimal performance; I was able to get this to spin for 3:25! The caps can either be pressure fit or glued together depending on the tolerance of your printer, there's only about a 3mm overlap between the male and female parts so i found it best to use a bit of CA glue to hold things together. The steel balls are heavy, and give this spinner a lot of rotational inertia. It's very high performance, and a blast to use!