T-Square for Staedtler Mars Aluminium Ruler

The Staedtler Mars rulers are my favourites, in fact I own every size between 15 and 50 cm! I needed a T-square for my drawing classes, and wanted something small to fit in my pencil case. This piece slides on to any Staedtler Mars Ruler and turns it into a T-square.

The model is symmetrical to make both edges of the rulers accessible to both left and right handers.

I had some slight issues with warping where the print touches the bed, so I used a brim to remedy this.