ABL fails, not probing in the front right corner, diagonal misalignment - Marlin-2.1.x-MPMDv2

[piberry]

Hi!
I have built the firmware without any changes and it works so far but there´s an issue with ABL.
Probing works in the center and in the front left corner but when moving to the front center and further to the front right corner, the position of the printhead is not right. The nozzle moves too high above the bed and is not able to push the button, therefore ABL fails.
I´m not sure what the cause of this diagonal misalignment is and how to fix it.
Any help is highly appreciated.

[piberry]

My bad. I wasn´t aware that deltas are special when it comes to calibration. Here is what i did to fix it:

I reverted to the original firmware, connected the printer to pronterface and sent G33. After the calibration i got these values:

Height:120.72 Ex:-0.19 Ey:-0.84 Ez:+0.00 Radius:61.77
Tx:-0.12 Ty:+0.13 Tz:-0.01

I then copied these values to configuration.h and made a new build.

This is it for my printer:

#define DELTA_ENDSTOP_ADJ { -0.19, -0.84, 0.00 } // Get these values from G33 auto calibrate

#define DELTA_TOWER_ANGLE_TRIM { -0.12, 0.13, -0.01 } // Get these values from G33 auto calibrate

I flashed the firmware, sent G33 again in Pronterface and saved it with M500. I calibrated the z-offset afterwards and now it prints like a charm!

I will investigate the "Delta radius and diagonal rod adjustments" tomorrow and see if i need to change those values too.

[TheThomasD]

Great, thank you for sharing this!