I noticed that left front corner of the bed was by ca. 0.8mm lower than the right corner. Since the bed levels mechanically against the bottom of the printer, there is an easy solution. :)
How do you figure it out if the bed is lower on one side?
Calibration and Tests → run Z alignment calibration
Auto home the printer & set Z to 0mm
Turn off the stepper motors
Move the head around the bed and see if there is a lower corner (mostly it is the left front)
Measure/estimate how much the bed is lower
Print the BedLevel Correction with the measured/estimated correction
Place it onto the stepper mount where the correction is needed
Repeat the process until you are happy with the outcome/result.
Print the Dust Cover Neutral for those leadscrews which don't need a correction.
Lead Screw movement after the correction
First Layer improvement before & after correction
Print settings: I recommend PETG, tolerances are tested with PETG