Woodworking squareness measuring tool

A simple jig that makes it easier to measure the squareness of woodworking assemblies. To use, place it on one corner of your assembly and let the magnet hold the end of your tape measure while you measure the diagonal length.

You need to print square.stl and clip.stl so that they are aligned (the clip prints in place in the pocket left in the square.stl). The magnet lid is printed separately.

To assemble, either tap M3 threads or simply drive a M3 screw into the hole on the underside and then drop a 10x3mm magnet into the slot and screw down the magnet cover. The magnet that I used is from:

https://www.amazon.com/gp/product/B07BK7XC5S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1