Powerful Bruticus-Spool Shelf Brackets

You will need 2 x 1-inch (25.4mm) diameter pipes (any material, the loads are very small). M5 threaded inserts are used and space was designed for them to be installed conveniently, M4 inserts will work in theory. 4 x 12mm long screws are required per assembly.

So, you have room for spools under a shelf with L-Bracket supports...I know, kind of a niche situation, but one I am living with. These came out so good and useful I had to share them. Once printed and assembled they can be hung securely without the need to screw them into walls, you will only need to screw in one assembly screw to lock them into position, securing the assemblies. 

Depending on the L-Brackets shelf support sizes (under 12-inch) modifications to the braces height may need to be done. Larger L-Brackets will increase the empty space over the spools.

Printing: This is industrial design; 0.28 thick layers of a ductile filament
PETG:
-Pipe Carriers: 3 shells, 25% 3D infill
-Braces: 4 shells, 15% 3D infill
-Hangers: 3 shells, 20% 3D infill
If you print these with another filament, please post your setting (especially if they fail, failures are wins if we share the information)