I am printing using a UV printer and then cutting with P2, I have found that over a length of 300mm the P2 is approx 0.6mm out.

I checked this by engraving a ruler onto some wood and then comparing it with a real ruler and it shows it to be out , see pics below. This error also ties up exactly with the error I was seeing between printing and cutting. 

Does anyone know how to adjust the steps per mm of the X and Y axis ( I believe both are out by the same amount) I know its not much but its wrong and I need it to be accurate.

For anyone else who wants to try, the svg of the ruler is below also, this was created online using https://robbbb.github.io/VectorRuler/ which is a ruler generator.