Square Edge with Rulers and French Curve
thingiverse
This square edge tool chiefly serves to aid drafters, designers, and sketch artists in making right angles on paper. The part's isosceles right triangle base has legs of 20 cm, an unmarked ruler of 7 inches on a leg, and 20 centimeters on the hypotenuse. The French curve cut out of the other leg can be used to a limited extant to sketch curves. There is only a single part to this tool. You should be able to use the hole near the right angle to fit the square edge into any ringed binder.
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