Universal Wall Mount Filament Spool Rack

This simple filament rack can work with square or round dowels (or pipes) in various sizes. It can accommodate square dowels up to 32mm or 1.25 inches, and round dowels up to 39mm or 1.5 inches. You can use screws with a shank diameter up to about 5.5mm. I recommend using 2 or 2.5 inch pocket hole screws, and driving them into studs. Use a little E6000 glue or clear caulking to secure the dowels to the racks.