I made 3 of them with my Prusa i3 in the past couple of days. I use them for all my filament spools now. The 2.6 kg spools fit just. I will print more. I tossed all other spool holder or roller. This design fits my needs perfectly. Thank you for the good design.
The bearings I pressed in with a workbench clamp. It's important to press them flat in. Any angle can make a problem.