Spool Roller (up to 1kg rolls, with bearings)

The problem with center axis spool rollers is that the have TOO little friction, every unbalance in the filament spool will show. And the filament slipping of the spool has also happened to me. So I took on the design of a tube spool roller where the spool rides in between and the filament has lees chance of jumping off. Also the available designs here on Thingiverse are having the spool ride too high for my taste - it's a balance thing.

This spool roller is designed to take 1kg spools up to