This is very quick design of a square. Surprisingly, the model is very accurate and can be used as a square. It costs 0.51€ of Prusa PLA.
Design still can be optimized : round-corners here and there, more labels to help the user while using the square (kids), the transparency of the bottom-layers could be improved as well (it is translucent).
Modify it, Print it, Share it, Ping me (romaindivozzo) on social networks so I get to know what you've done with the design.
The author hasn't provided the model origin yet.