Sometimes the need arises to perform the representation of small circles, something that is quite difficult to do with a common compass, this tool tries to help in the process. It is a tool known as a diameter template. In the corners appear 4 of the most common rays in the design of mechanical constructions. The goal is not to create an accurate drawing tool, but something quick and easy to print. 
Diameters compensated with 0,5m for the average mechanical pencil 

It is divided in several bodies to thus allow coloring more efficiently.

• 21-07-2023: Small update to make easier the drawing of external radius.

This design is free for the benefit of the community, but If you like my designs and want to contribute, you can make a donation to buymeacoffee  or paypal, that will be greatly appreciated.