XYZ calibration test.

The test consists of printing twice, the first time to see how the steps of the axis are, once printed you lame the sizes to see if it matches what you expected, but it matches what you need to calibrate the number of steps per mm:

e = expected dimension
o = observed dimension
s = current number of steps per mm

then:

(e/o) xs = your new number of steps per mm.

Once calibrated I recommend printing a second time to see the final results.