Triangle Shelf Bracket

These shelf brackets mount on the previously existing curtain rod screws in my bedroom. Your screws will need to have a thread diameter of 2 perimeters and >4 top/bottom layers so they screws don't rip out. Infill doesn't make much of a difference past 30% or so.

Make sure to use enough brackets and screw into a stud, I claim no liability if you stack a bunch of textbooks on your shelf and mess up your drywall :D