Simple straight edge for drafting/drawing. The engineering scale-inspired shape and the shortened length over a normal ruler make this straight edge ideal for drawing smaller things on normal-sized paper. I recommend printing this on end to eliminate the need for support material. If bed adhesion is a concern, use glue, a brim, or something else to help reinforce the bond. I also recommend printing it solid so you don't have to worry about it breaking if you plan on throwing it in a bag.