Holder for 100mm engineering square using 2 x 3 Gridfinity tray.

It's a tight fit based on a square that is 100mm x 70mm. The width is 18mm. 

Made it stackable

I put a small tray space for extra bits but open to suggestions on how to use the space better.

There are no magnet holes, but I can mix one if there is a need.

Better printed as lower layer heights .2 or below.

Gridfinity system by Zack Freedman, many thanks to Zack for his genius and generosity.