This is a protective support designed for the corner of the printrbot GO. It's a parametric OpenSCAD design so can be tweaked to be a different size, thickness, screw dimensions (diameter, head, location, etc.) and fillet sizes.

All of these tweaks are now customizable using Customizer.

I uploaded an STL of the the design with some semi-random parameters thrown in, so if that works for you (or you just want to scale it in another STL editor), then great! Otherwise, download the SCAD file and tweak some of the parameters to your liking.

Added provision for countersunk screws and the STL file is a pretty good size for the printrbot GO (see pic).