Turn off the whole machine power. There are four screws for each side, loosen them then you can fine tuning the angle of the X Axis. Shown as bellow.
Diagonal line 1 = Diagonal line 2.
Error value must be less than 0.5mm like below:
①If the Diagonal line 1 > Diagonal line 2.
Please adjust as follow:
②If the Diagonal line 1 < Diagonal line 2.
Please adjust as follow:
Above are just fine tuning the angle of the X Axis, if the error still more than 0.5mm, please further to the solution 2.
Y Axis and coupler
Unfix the Y Axis then loose one of the coupler ensure each sides can move separately.
Measure by ruler, make sure they are the same distance as follow:
Then tighten the screws for each side of Y Axis firstly, please do it carefully by tighten slowly to ensure the angle of Y Axis doesn’t change. After fix them then measure the distance again, ok, then fix the rest of the screws. It’s ok if the error within 0.5mm. finally, fasten the screws of the coupler.
End.