CAD model, 9.75" wide, 8" tall, 1" thick along the main section. The corner screw hole boss is offset so you can attach a screw to the wall/shelf. The upper wall screw is angled so that if you have the lower hole lined up with a stud, you can hit the stud with the upper hole as well if you use a 3" screw. The holes are sized for drywall or deck screws.

I used PLA basic, in the "0.2mm Strength" setting on the Bambu Studio Slicer, printed on a Bambu X1C. No support.

More info about the load testing HERE