Woodworking square

This is a simple square to check squareness on my tools around the shop. There are two versions, one with holes for 12x2mm magnets and one without them. The magnets I used can be found here. I used superglue for the magnets.

The square is designed to be thick at 20mm. I find this is better for checking square on tools. The length of each side is 111mm or 4.37 inches.

I printed it laying down on its side.