Impetric Ruller

This unique ruler not only allows you to work in metric inches, but also includes the universally useful imperial centimetres.

Achievable accuracy (with a correctly calibrated printer):
* 1 decinch
* 1/8th cm

This standard 10 inch rule will print correctly on an Ender 3 (225 x 225 mm) if you rotate it 45 degrees so it lies diagonally across the print bed