Square Check tool

Inspired by a device from a well known wood working tool company. Helps hold your tape measure when measuring corner to corner to confirm the squareness of a box. The square cut-out goes over the corner and the slot is for your tape measure. The rotating section allows it to work on rectangles as well as squares.

Improved V3 - Printed and confirmed working. There's still room for improvement but not sure when/if I'll have time. Would love to see someone remix this and fix the remaining issues:

1. The rotating part is very crude and likely to print poorly because it's all 90 degree angles/overhangs. Should be redesigned with bevels instead.
2. The real device this was inspired by has a magnet embedded in the top to help hold your tape measure - would be really easy to add a cut-out just have to decide on an easy to source magnet.
3. Would be nice to make the design properly parametric so it could be resized. I just tossed this together and didn't pay much attention - but