@spauliszyn : Did you ever figure out if you need M420 S1 or not in Cura ? I've got the same question.. and it sadly doesn't seem to have been answered anywhere on the forum clearly.

@bucweat did you ever figure out if you need to do the M420 or not ? I have the same question.. not sure what to put into my Cura (4.8) default profile! Would appreciate learning from whatever you've experienced !

A question that has not been answered here still is this: is ABL on without an explicit M420 S1 command ? There's lots of warning in the marlin firmware documentation that a G28 disables auto-bed-leveling and you need to turn it back on afterwards.. i'm getting mixed messages about whether it is required in the preamble G-code for your slicer.

Would appreciate advice here from either the community or @admin !

@BD : To clarify here, what's the recommended setup and GCODE when using something like octoprint / Astroprint to print via tethered USB ?

1. You should leave the SD Card in there
2. You should level the bed via the LCD
3. You need to do "something" to the standard Cura GCODE to get ABL to take / not be ignored ?

Step 3 is where i'm missing something. Right now, as of the latest Cura, with the built-in CR-6 SE profile that's now included, I have the following start / stop GCODE... is using this profile and then printing via Octoprint (or any other method) ignoring the benefit of ABL by using G28 as it is ?

Does it really matter if I send this GCODE via Astro/octo-print or via SD card? I would think it would be the same, no ?

Start:

M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk
M220 S100 ;Reset Feedrate
M221 S100 ;Reset Flowrate


G28 ;Home

G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up
G1 X10.1 Y20 Z0.28 F5000.0 ;Move to start position
G1 X10.1 Y200.0 Z0.28 F1500.0 E15 ;Draw the first line
G1 X10.4 Y200.0 Z0.28 F5000.0 ;Move to side a little
G1 X10.4 Y20 Z0.28 F1500.0 E30 ;Draw the second line
G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up

STOP:

G91 ;Relative positioning
G1 E-2 F2700 ;Retract a bit
G1 E-2 Z0.2 F2400 ;Retract and raise Z
G1 X5 Y5 F3000 ;Wipe out
G1 Z10 ;Raise Z more
G90 ;Absolute positionning

G1 X0 Y{machine_depth} ;Present print
M106 S0 ;Turn-off fan
M104 S0 ;Turn-off hotend
M140 S0 ;Turn-off bed

M84 X Y E ;Disable all steppers but Z