DRACBB Fidget Spinner

DRACBBFS (Double Row Angular Contact Ball Bearing Fidget Spinner) A double row angular contact ball bearing is usually used to transfer a mix of axial and radial loads through rotating shafts.This version has a relatively loose tolerance to decrease friction for maximum 'Return on Inertia'. The hole should fit most grown man's finger sizes, up to about the proximal phalanx. I added some small empty volumes in the outer ring near the outer perimeter to 'force' the slicer to add mass/inertia as far to the outside as possible while minimizing overall mass increase.In theory, that is. The toy spins quite freely, and the knurled perimeter helps with achieving higher rpm's.Because it's not entirely quiet though, it's advisable to not fidget in sound sensitive environments. The toy needs BB-balls of '6mm', which translates to an actual dimension of Ø5.93, see attached image for reference. The assembly with (2x) 10 balls is a bit tight, so for easier ass