Billy Filament Storage

This is my variant on Billy Filament Storage shelves. Everyone else uses pipes or rods, but I wanted more laying surface against the filament roll. So I did this with a squares 20x20mm aluminum profiles. I have used the original holes in the bookshelf I have mounted 3 shelves in half of my full height Billy bookshelf, and then you get some extra space at the bottom. So with this you can fit up to 33 pcs, (11 pcs per shelf) filament rolls, and at least 6 boxes or rolls in the bottom I cut the aluminum profiles to 75cm for an extra good fitting I used (BOM) per shelf4 pcs of 3x16mm hex screw2 pcs 75cm, 20x20mm Square profile2 pcs printed consoles times 3 if you want to do it like me.