Creality K1 Filament Spool Holder

The holder is mounted on the side walls, using a 20x20 aluminum profile with a length of 400. The mounted filament holders of my design:

https://www.printables.com/pl/model/958015-universal-filament-spool-holdercarriage

The project requires:

Aluminum construction profile 20x20x400 mm - 2 pcs
M4/10 - 4 pcs - for mounting profiles to the holder
M3/8 or M3/10 - 4 pcs - mounting the holder to the printer

I mounted the filament guide at the back of the printer, it prevents the filament from unwinding and falling off the spool during printing.

The project was re-made based on the original. I reinforced the mount and enlarged the chambers for the profile.