This is a small ruler for drawing circles. Available sizes are: 1, 3, 4, 5, 10, 15, 20, 25, 30, 35 and 40 millimeters of diameter. It is great for fast drawing where precision is not the most important. It can be customized using OpenScad for making personal circle sizes.

Una pequeña regla para dibujar circunferencias. Círculos disponibles:1, 3, 4, 5, 10, 15, 20, 25, 30, 35 y 40 mm de diámetro. Perfecta para dibujar rápido cuando la precisión no lo es todo. Puede ser personalizada mediante OpenScad para crear un mayor numero de círculos o diferentes medidas.

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1- Download the stl file for direct printing or the source file to customize it.

2- Customize it if needed

3- Print it, I use ABS but it could be also printed in PLA

4- Visit our blog for more cool things: d0ke.wordpress.com

Ring are useful in both sides.