Y offset to Z axis when printing

Hello.

After calibrating my filament, I have now printed 2 larger objects.

Both objects are put together. Unfortunately, I had to see that the angle between the Y and Z axes was not correct (pressure diagonally upwards at the back).

The angle between the X and Y axes is correct.

Printer “Creality Ender 3V3 KE”.

Englisch

I checked the angles between the y and z axes.

And the Z-boom tilts backwards. To the printing plate as well as to the frame.

How can I adjust the boom correctly since it is only attached from below with 3 screws?

At the top of the Z leadscrew is a collar on the pulley that drives both leadscrews, on the right hand one loosen the grub screws you can then manually rotate that leadscrew to level the X gantry. Place 2 equal size things ie can of beer or gluesticks and adjust so it is level, retighten the grub screws. Or is the Z axis not square to the bed? I fitted some gantry supports to get mine square, that’s my V3KE but it is the same on my V3SE.


https://www.printables.com/model/730007-ender-3-v3-se-ke-gantry-support

Thank You.
How did you attach the holders to the front of the case?
Just hole in the housing and screw the nut through? Or a counter plate inside?

Right hand side it uses the existing mounting holes. Left hand side, drill, screws and nuts. There are other gantry supports/mounts available on Printables/Thingiverse.