Fidget Spanner Spinner Hand Toy

Everyone keeps making the same minor variations on the same spinners, so here's something more original. For those who don't like the sharper corners, there's also a smooth variant.

This is a small spinner that uses 625zz bearings with an outer diameter of 16 mm and a thickness of 5 mm. The small size makes this especially kid-friendly, and allows adults to swing it around in one hand when holding it at one of the outer bearings.
The spanner is 9 mm size and should be functional if you either don't put too much stress on it, or have it printed in steel :)

You can fill the holes in the bearings with caps in the shape of a ‘bolt’ and ‘nut’ to greatly improve the *fidgetability.* Because the smaller caps are also 9 mm, you could hook up multiple of these spinners together. The nuts/bolts come in two sizes, the smaller one is 9mm, the bigger one is 10mm and is thicker, which makes it ideal for the center bearing because it allows the spinner to be placed on a flat surface while spin