Somewhat inspired by this model https://www.printables.com/model/377238-filament-spool-holder-roller-with-bearings-625-and

But I wanted something smaller to fit in my SmartStore Dry box, so this model is less than 9cm wide, to make the most of the available room. 

Latest files and FreeCad project can be found over here: https://github.com/brujoand/XYZ-models/tree/master/freecad/Voron/FilamentRoller

Print two of everything at 40% infill and you should be good. The only requirements are 4 625zz bearings, I pulled the old ones from my old Ender 3 S1.