Auto bed leveling bilinear incorrect leveling

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[BUG] Auto bed leveling err
Hello,
I wanna use BLTouch with my 3d printer with AUTO_BED_LEVELING_BILINEAR.
Leveling completes, but while printing it makes errors, like it wasn't properly leveled, sometimes with bigger differences.
Z offset is good, and NOZZLE_TO_PROBE_OFFSET is set precisely.

There is no mechanical error, nothing is lose or I have no similar errors in my setup.
I also warm everything before G29 to printing temperature.
I ran the Z_MIN_PROBE_REPEATABILITY_TEST, and seems fine.

READ: Mean: 0.009500 Min: -0.005 Max: 0.035 Range: 0.040
READ: Standard Deviation: 0.010764

The machine is a costum built one with mega 2560 and ramps 1.4. Drivers are TMC2208 with serial connected too.
I have lead screws on all axes.

I attached my configuration and I tried withthe latest source from lts-2.1.1 and bugfix-2.1.x too. Also attached some screenshots.

If you got any ideas what i messed up, please help me out.

well this is silly, but dont know if it is what is causing your issue

#define ENABLE_LEVELING_FADE_HEIGHT
  #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
    #define DEFAULT_LEVELING_FADE_HEIGHT 300.0 // (mm) Default fade height.
  #endif

enable leveling fade height
but then set the height higher than your max Z... effectively disabling it

Does your probe accidentally measure onto the clamps holding the bed?
set the measuring matrix to 3x3 so it does not take too much time and then watch every movement until finished.

which printer do you use?

did printing work without BL touch?

Edited 1 time(s). Last edit at 02/16/2024 06:05AM by JPT.

Hello,
the printer works, I just wanted to make it easier to use. 3D touch is the probe. This is a homemade printer. The bed is 4mm glass.
A 3x3 mesh also gives the same result. It also gives the same bed level for multiple measurements.
The Z motors move, but not enough to level.
There are no mechanical problems. All axles are leadscrews.