@Phaedrux I actually measured my bed from the gantry and it was quite a bit off. The gantry itself is super square but the bed was slightly tilted. Also after watching some videos from TH3D I wasn’t calibrating the actual sensor properly. The bed needs to be heated when probing and the probing speed lowered to 15mm/s. The sensitivity of the sensor has to be adjusted as well with the nozzle touching the bed and the sensor approximately 2mm off of the bed.

Printer is an Ender 3 pro with 1Z motor but dual axis setup and linear rails. There is a lot of weight on the X&Z axis now with the 3Dfused linear rail kit and direct drive setup so I may need an anti backlash nut. After I did the Z calibration my nozzle was slightly going into the bed.

@Phaedrux Thanks!

Hello, I'm trying to implement the following script from TH3D for the EZ ABL pro. Will I need to adjust the G-code as I assume some of the commands are different between marlin and reprap?

Also what "flavor" do I tell my slicer in the machine settings?

Here is the link to the TH3D start G-Code page:
EZ ABL Start G-Code

M117 Print Starting...
M75 ; Start Print Timer and Engage Fil Sensor if USB Printing
M84 E ; Disable E Motor for probe accuracy on direct drive systems
M117 Antiblob retract...
G92 E0 ; Reset Extruder distance to 0
G1 E-2 ; Retracts filament to prevent blobs during probing
G92 E0 ; Reset Extruder distance to 0
M117 Homing All...
G28 ; home all axes
M117 Homing Z Probe...
G28 Z ; home z again
M117 Generating mesh...
G29; auto bed leveling
M117 Heaters Recovering...
G4 S10; wait for heaters to recover
M420 Z0; Z fade
M900 K0; LA

M117 Purging extruder...
G92 E0     ; reset extruder
G1 Z1.0 F3000    ; move z up little to prevent scratching of surface
G1 X0.1 Y20 Z0.3 F5000.0  ; move to start-line position
G1 X0.1 Y100.0 Z0.3 F500.0 E15  ; draw 1st line
G1 X0.4 Y100.0 Z0.3 F5000.0  ; move to side a little
G1 X0.4 Y20 Z0.3 F500.0 E30  ; draw 2nd line
G92 E0     ; reset extruder
G1 Z1.0 F3000    ; move z up little to prevent scratching of surface

M117 Printing.....

@fcwilt Thanks!

@fcwilt I understand, I'll order some endstops for the top of the z axis. What would be the Gcode commands for this?

@fcwilt this isn't my printer but it is how my z steppers are setup. Perhaps it would be better to run these motors in series? My goal was to make sure my x gantry was square with the frame. Or if possible, is there a stall detection option similar to the prusa at the top of the z axis?

@fcwilt I have modified my printer with an EZ ABL Pro and dual Z axis steppers in addition to linear rails, mosquito hotend, bmg extruder, and a silicone heatbed.

@fcwilt ah ok. I'll make sure its added to my bed.g file.

@Phaedrux when you say "level out the bed" i believe you are referring to a corexy type of printer in which the z axis motors are moving the print bed itself. Does it make any difference that my motors are attached to the x Gantry (ender 3 setup)?

@fcwilt are you referring to the z probe trigger height that is saved in the config.g file?

@Phaedrux

Do the G30 probing commands for the lead screw calibration go before or after the bed mesh compensation commands?

From the wiki example:

G28 ; home
M401 ; deploy Z probe (omit if using bltouch)
G30 P0 X20 Y190 Z-99999 ; probe near a leadscrew
G30 P1 X180 Y190 Z-99999 ; probe near a leadscrew
G30 P2 X100 Y10 Z-99999 S3 ; probe near a leadscrew and calibrate 3 motors
M402 ; retract probe (omit if using bltouch)

Would i do this before the bed meshing?