My MPCNC Primo z-axis is not perpendicular to my workspace, I have no clue on how to adjust this. It is only in one direction. The other side ist OK

Update: disassembled the complete spindle assembly: I checked the z axis and spindle and found one screw loose on the core. I do not understand why this impacts the axis in the direction mentioned above, but it looks perpendicular now.

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