I designed this all-in-one protractor and mini ruler for my middle school math classroom so students only need one tool during geometry lessons. It combines a 180° outer protractor, a smaller inner protractor for quick angle checks, a 10 cm ruler, and a set of basic 2D shape stencils. My students use it to measure and draw angles, sketch shapes, and practice area and perimeter, and it has helped a lot when they forget their own geometry sets.

The model is multi-color ready. In Bambu Studio, I used separate colors for the ticks, numbers, and body so the angles are easy for kids to read at a glance, but it also prints nicely in a single color. I have tested it in PLA and PETG, and both work well. The size fits comfortably in a student’s hand and can slide into a pencil case if you want to gift it to them at the end of a unit.