M73 gcode works from the serial connection, ignored from SD card

Sovol SV06 Plus
1

I like my recently purchased Sovol sv06 Plus overall, but there is one major annoyance: I like to put G29 (25 point bed leveling) command inside my gcode file (to print from SD card), but when I use the original Sovol firmware, the printer screen gets stuck in G29 screen, so I cannot see the print progress and cannot pause or stop the print.

Then I found the custom version of the firmware by smkent (GitHub - smkent/sovol-sv06-plus-firmware: A fork of Sovol's Marlin firmware for the SV06 Plus 3D printer), where he supposedly fixed that issue. Indeed, after I installed the custom firmware, I can issue G29 command from gcode on SD card, and it exits (doesn’t get stuck). But unfortunately, it exits to another screen (Z offset adjustment), and again I do not have the option to pause or stop the print.

Apparently what was missing is additional M73 commands (Set Print Progress). And M73 worked as expected - but only when issued from my laptop connected to the printer. Specifically, after I run G29, I can issue M73, and then the printer’s screen is showing the remaining time/pause screen. Great - except that the same M73 command is completely ignored when I add it to the gcode and print it from SD card. (I used Cura’s post-processing script Display Info on LCD, and I verified that indeed the script injected a bunch of M73 commands - every layer change.)

Does anyone know how to fix this issue? Specifically, how to make M73 work from SD card (when it already works from the serial connection)? The must be an “if” statement somewhere forcing the firmware to ignore M73 when it is issued from the SD card.

Or may be there is another fix to the original (G29 gets stuck) issue, where the screen is switched to the remaining time/pause screen at the end?

Thanks for any help!

2

I changed G29 to M420 ; S1

3

I know, that’s how it was initially in the Cura provided by Sovol, but I like to run G29 every print.

I am looking at Configuration.h file, and I see a potentially interesting item:

/**

  • Commands to execute at the end of G29 probing.
  • Useful to retract or move the Z probe out of the way.
    */
    #define Z_PROBE_END_SCRIPT “G28 Z\nG1 F200 Z0”

I wonder what happens if I comment this line out? Perhaps running G29 from SD card will not get stuck in the “G28” command? Or may be I can add something to that line - may be M73?

BTW if anyone is interested, I enabled g-command M48 (Probe Repeatability Test), and then I executed M48 from my laptop at the center of the bed heated to 65C. The results are very good - standard deviation is only 0.004 mm, and the full spread (measured 20 times) is only 0.014 mm - more than enough for an accurate bed leveling. Now I’m thinking I can try to increase the speed (X/Y and Z) used during G29, to make it run faster; the accuracy may still be good enough. And then perhaps I can increase the number of points - like 7x7 (instead of 5x5).