This is a filament rack / shelf that is mounted to a 18mm thick wooden board.
Of course you can use any kind of brackets to mount the board to the wall, I choose some from IKEA.
The bar on which the spools are stored should have a diameter of 20mm.
Additionally you can add filament cleaners.
The bar holders and the cleaners can be fixed with screws.
Printer Brand:
Creality
Printer:
Ender 3
Rafts:
No
Supports:
No
Resolution:
0.2mm
Infill:
20%
Notes:
Cleaner should be printed with support