Keyboard Shelf - Lip Mounted

I was looking for a lip mounted keyboard shelf, I couldn't find one so I made my own. It's meant to fit on a 3/4in wood lip. I included a hole for a screw to be fastened to lock it into the wood lip. I did 4 wall layers just for piece of mind since the screw threads will cut into the walls but it may not be necessary Material: PLA Infil: 10% Walls: 4 No supports or brim needed