Shelf bracket, fits a build plate under 6"x6".I printed this in PLA with 30% infill, 205 extruder and 60 heated build plate... came out very strong. I only have a 6x6 build area otherwise i would of printed them larger, but id imagine you can scale this for any size required. The inside screw holes are a bit hard to get to, but was able to use a flexible screw driver to get them tight.