Wall Shelf Brackets (FreeCAD)

Printed in 0.3mm -- PLA -- 4 perimeters -- no supports -- 25% Gyroid infill

Mounting holes are roughly sized for 3.5mm screw (3.4mm bore, 7.25mm dia. countersink)

Rear gap to pass cables

Pictured model is 100 mm deep x 405 mm wide (or 16") and using 1/4" Plywood (4.75mm) 

Semi-parametric FreeCAD file included to adjust parameters to your needs

*Note: relatively sturdy but not load tested :()