Corner Cut Jig (with ruler) for Bookbinding

This is a corner cut jig for cutting the corners of book cover cloth/paper.

There are a few of these out there. I made this for three main reasons:

1. There's a little ruler on the side to mark the width of the fold-over section of the cloth
2. It's parametric, so you can adjust various sizes (spacing from corner, various thicknesses, size of ruler, etc.)
3. I like to model stuff myself because it's fun.