This is a simple one-piece small shelf that can be scaled in your slicer to stretch or shrink to fit your needs. I also included the FCStd file if you'd like to alter the CAD model to rescale the design without changing the size of the mounting holes.

For light duty use, drywall screws or decking screws into drywall are sufficient if the screws aren't torqued too much to drill out the fragile drywall. For heavier loads, screw into a wall stud or use the deep threaded screw-in plastic wall anchors and the supplied screws.

This is a structural part so please use four or more outer layers (top, bottom and sides) and 20% infill.