Filament holder REDUX

This filament holder is reusing the mounting bracket and mounting bracket nut from the [Ender 3 - Filament holder DELUXE](https://www.thingiverse.com/thing:3114139) and therefor fit any original bracket as on the Ender 3 (i.e. with a 30 mm hole).

The design goals was functional with few parts, quick print time, as little support as possible and with a clean look. The spool holder was inspired by [ReFiller - Filler-compatible, self-centering filament roller](https://www.thingiverse.com/thing:4605360).

You will need the following hardware:
* 1 pcs 135 mm long M8 threadbar.
* 2 pcs 608 bearings.
* 2 pcs M8 nylon lock nuts.
* 2 pcs M8 washers.