Sewing Machine Foot Cover

This is a little cover for the foot of a sewing machine. My wife's Singer Quantum Stylist keeps recentering the needle off center on start up and until she can get it fixed, she wanted something to put over the foot to remind her to adjust the needle before sewing so the needle doesn't hit the foot. I whipped out my calipers to get some measurements, fired up OpenSCAD and came up with this. First print worked like a charm.

It's not one of my best SCAD files since I didn't bother with var