I love the Dry-Box found in this thing: https://www.thingiverse.com/thing:3447986
But i hate making new Spool Hubs for every new Filament: Why does all Brands need to have a different diameter?
So i decided to make a Spool Roller which fits in the Box. You need 2x 608 Ball Bearing.
Printed in PLA on my Ender 3, sliced with Cura in 0,28 all parts snap tight, so i didn’t have to clue anything.
Depending on the Design with only Bearings in the center, the Spool can wiggle a bit. But within my tests it doesn’t matter.
I think this Filament Pass-Through is very suitable: https://www.thingiverse.com/thing:3024407