Miter box for US 1.5-inch PVC pipe (50mm)

Similar to my other miter box (https://www.thingiverse.com/thing:3034823), this is a miter box that I made specifically to cut PVC pipe at US 1.5-inch internal. I don't know if this is how it's done in the rest of the world, but in America the pipe diameter is the inside, not the dimension on the outside. The external diameter is actually 48.6mm or roughly 1.9 inches.

I decided to make this a uniform 50mm width (you know, to be globally-minded), so there is a tiny bit of wiggle room when usin