Filament Spool Roller Arm

This design can handle huge filament rolls (2.5kg) just as good as the small ones (800g).
It's designed to stand on a flat suface.

All you need is:
* 2x M8 rod
* at least 8x M8 nuts
* at least 4x 608(zz) bearings

For the bearings you could use this one: https://www.thingiverse.com/thing:3123485.
You can upscale Spool Roller as you wish - mine can handle up to 3 filament spools.