Summary

Get rid of these neurotic fidget spinners. They really don't relieve your stresses or even make them worse. What you need is tapping your fingers on your desk, or even better, use this 3D printed, two component stress reliever Thing. No high speed, so no ball bearing required. Just take it between two fingers and let your thumb turn the wheel. No one has to see it because it is so small that you can use it in your pocket. Concentrate and relax. It feels like counting banknotes.
If you really prefer the smooth operation of a ball bearing(D=16, d=5, h=5), print version 2. Version 2 requires support. Apply pressure to combine the printed parts with the bearing (use a vise).
Problems with dimensions? The OpenSCAD files are attached as well.
If this Thing does not work for you, throw it at your colleagues.
https://youtu.be/wMCroYL4R9k
https://youtu.be/McF4P3PJdyI