[BUG] Ender 5 Pro, Auto home & prints off center (10mm low), possible culprit for ABL issues

[txt4nk]

This is my first time posting an issue like this, so in advance, if I have not done something right or provided enough information, I apologize.

Bug Description: edit The ABL was working beautifully 3-4 weeks ago. I had an E3 Mini V1.1 board in the printer, it gave me a TMC connection error on the X axis. I then switched over to the ezboard and immediately encountered this problem. I figured it was the board so I then tried both E3 DIP setups mentioned below in configurations, no change. I finally on my replacement E3 Mini board, (this time a V1.2) and still, no joy. end of edit

Auto home puts the probe\nozzle 10mm lower than the center of the bed. I have also had absolute hell getting my bltouch to actually provide a mesh that works (its off really badly) and now I'm wondering if the two issues are related. I have messed around with changing the z safe homing x and y points to the older "((x_bed_size) / 2)" to see if that worked or not, still not centered. The configuration files I've created below are bugfix 2.0.x & example configs downloaded on 05/27/20 at 11:30AM CST.

My Configurations: Firstly, my printer and all hardware changes. Ender 5 Pro E3D Hemera Authentic Antclabs BLTouch 3.1 BTT SKR E3 MINI V1.2 (I have tried the eboard lite & BTT SKR E3 DIP with both 2208 and 2209 drivers, problem replicates on all 4 setups)

My current firmware state, after all self troubleshooting before waving the white flag. Marlin-bugfix-2.0.x.zip

Steps to Reproduce:

1. Compile firmware w/ marlin supplied Ender 5 Pro configurations (string config author shows @thisiskeithb) a. Changed all necessary items for the SKR E3 Mini V1.2 aa. #define SERIAL_PORT 2 (configuration.h) ab. #define SERIAL_PORT_2 -1 (configuration.h) ac. #define MOTHERBOARD BOARD_BTT_SKR_MINI_E3_V1_2 (configuration.h) ad. //#define SPEAKER (configuration.h) ae. default_envs = STM32F103RC_btt_512K (platformio.ini) b. Changed all necessary items for the E3D Hemera (just esteps) c. Uncommented BLTouch (-46, -2, -4.1), multiple probing (2), HSmode not enabled. d. Uncommented Auto Bed Leveling UBL e. Uncommented restore level after G28 f. Uncommented z safe homing g. #define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
2. Flash to printer a. Init EEPROM
3. Auto home
4. measure distance from BLTouch probe to the top of the bed
5. measure distance from BLTouch probe to bottom of the bed

Expected behavior: steps 4 and 5 should both have a measurement around 117.5mm

Actual behavior: step 4 results in 127.5mm step 5 results in 107.5mm

Additional Information: As mentioned in the title, my ABL mesh is so horribly off that the one and only way I've been able to get my printer to run a "decent" print, which only lasted 3 prints, was to go UBL, run 15 points, and spend 2-3 hours adjusting the mesh manually.

Thanks in advance.

[firestrife23]

Just want to chime in because I'm having same issue with TH3D's EZABL as well. It seems to be increasing by 0.020 - 0.040 mm after each z-offset calibration and still drive right into the bed.

EDIT: Had to roll back to 3-23-2020 Build which was working well.

[txt4nk]

I've rolled back all the way to Marlin 2.0.3 and still have an issue.

I am also still fighting Z Safe Homing, it will not home in the center of my bed. It's always 10mm low.

[txt4nk]

So I got my printer to home in the center of the bed finally.. Had to make the adjustment below to the z safe offset

define Z_SAFE_HOMING

if ENABLED(Z_SAFE_HOMING)

define Z_SAFE_HOMING_X_POINT X_CENTER // X point for Z homing when homing all axes (G28).

define Z_SAFE_HOMING_YPOINT **(YCENTER + 10)** // Y point for Z homing when homing all axes (G28).

But sadly.. it did not help the ABL issue.

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