I was a very big fan of @AgonyEcho's 2-Bearing spinner, but wanted to use caps for the bearings. The bearing caps I found from @idnarbjm stuck out quite a bit, so I increased the overall height of the spinner, brought the edges out, and beveled the outside edge for maximum pocketability. If you aren't going to use the caps, there is an overall thinner version provided as well. When I was done I figured I might as well make a centered, 1 bearing spinner as well, which is also provided in both tall and short versions. Uses standard 22mm x 7mm skateboard bearings (I used ABEC Red 7s).
The 2-Bearing spinner has a small spike in the middle for spinning like a top on a flat surface. If using the smaller version with no caps, it may be smart to shorten the spike or it may stick out quite a bit (it's a simple model edit, 1 vertex)
The caps can be very tricky to print, as they are concave domes. I found the most success printing in this orientation (135 degree Y rotation):
I printed all parts with the exception of the 1-bearing spinner body, at 15% infill. The 1-bearing spinner body I printed at 85% infil because I didnt't want to have to use more bearings for weight, lol.
The author remixed this model.
The 2-bearing spinner has the holes filled, the overall size is slightly increased, and the edges beveled. Also included are caps for the bearings.