3D Solutech Bearings for Ender 3

I use 3D Solutech filament and didn't like how the filament spool dragged on the Ender 3's spool rod (even with the filament guide). So, I built some bearings and a sleeve to allow the spool to freely spin. They spin actually quite well.

It requires qty 22 Airsoft BBs (6mm diameter) per bearing. When the z layer reaches 8.0mm, pause the print, insert the BBs, then resume the print. Any higher than 8.0 and the balls won't freely fall into place. You will need to watch the printer after