A simple calibration model. Instead of a 20mm calibration cube, this is more of a xyz squared ruler.

The beams are 10x10mm thick and 100mm long. The extra long beams will give you a more accurate result when calculating the steps per mm for each axis, compared to smaller calibration models.

There are 1mm ruler markings carved out of the model, and X, Y and Z markings at the end of each axis (so make sure to print it in the right direction)