EDIT: Silly me forgot that arrays are zero indexed, so before we probed a square that was turned 90 degrees to what it should have been.

Hihi.
I made this little snippet to have your printer only probe the bed in the areas where you have your prints.
I have only tested it on SuperSlicer, but the command fully complies with PrusaSlicer documentation.
You insert this script in your "printer settings" section, in the "start g-code" box.
It should go after you have heated the bed, and after G28, and G32.
This replaces your normal G29 command.

;--- Start adaptive mesh probing
M557 X{first_layer_print_min[0]}:{first_layer_print_max[0]} Y{first_layer_print_min[1]}:{first_layer_print_max[1]} S20  ;define probe area with 20mm between each probe spot
G29 S0 ;start probe, save and activate height map
;--- Stop adaptive mesh probing

I made this for my V-core3.1.
Here is my full start g-code, in case you need it, or have suggestions for improvements.

M115 U3.1.0 ;tell printer latest fw version
M83  ; extruder relative mode

; Heat bed before probing so heat expansion of bed is mostly accounted for
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp

G28                         ; home all
G32                         ; make sure build plate is level. 3 point probe.

;G29 S1                      ;load mesh (disabled because of adaptive mesh probing)
;--- Start adaptive mesh probing
M557 X{first_layer_print_min[0]}:{first_layer_print_max[0]} Y{first_layer_print_min[1]}:{first_layer_print_max[1]} S20  ;define probe area with 20mm between each probe spot
G29 S0 ;start probe, save and activate height map
;--- Stop adaptive mesh probing

; Heating nozzle after probe so we avoid oozing
M104 S[first_layer_temperature] ; set extruder temp
M109 S[first_layer_temperature] ; wait for extruder temp

;---start adaptive purge line
G92 E0.0 ; reset extruder
G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]} Z0.8 F6000.0 ; position 10mm left from the lower left of the first layer
G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]+30} E6 F360.0 ; extrude some filament in the y direction
G92 E0.0 ; reset extruder
G1 X{first_layer_print_min[0]-30} Y{first_layer_print_min[1]+15} E6 F360.0 ; extrude some filament in both the x and y direction
G92 E0.0 ; reset extruder
G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]} E6 F360.0 ; extrude some filament returning back to the start
G92 E0.0 ; reset extruder
;---end adaptive purge line

@droftarts they have a section in their assembly instructions specifically for the 6HC that said to use io2.
I figure they just copied over the mini instructions without actually testing it beforehand.

Anyone care to look this over for glaring errors?
It does spit out a valid grid for me, and expands toward start of x and/or y if you go beyond bed edge max

;--- Start adaptive mesh probing
; this defines a minimum size of 60x60 mm grid for probing if your print is too small, with 20 mm between probes. if you have placed your print items too near the print bed end, we move probe area, so we don't probe outside the print bed.
{if first_layer_print_size[0] > 60 and first_layer_print_size[1] > 60
}M557 X{first_layer_print_min[0]}:{first_layer_print_max[0]} Y{first_layer_print_min[1]}:{first_layer_print_max[1]} S20 
{else
}M557 X{
  if first_layer_print_min[0]+60 < print_bed_max[0]}{
    first_layer_print_min[0]}:{first_layer_print_min[0]+60}{
  else}{
    first_layer_print_max[0]-60}:{first_layer_print_max[0]}{
  endif} Y{
  if first_layer_print_min[1]+60 < print_bed_max[1]}{
    first_layer_print_min[1]}:{first_layer_print_min[1]+60}{
  else}{
    first_layer_print_max[1]-60}:{first_layer_print_max[1]}{
  endif}{
endif} 
G29 S0
;--- Stop adaptive mesh probing

@imonsei I just thougt of a potential error: if you don't define a probe grid big enough, the printer will be unhappy about this.
I modified my script, so it always takes at least a 60x60 millimeter grid, for a 3x3 probe grid.
I have made checks, if you place your items too far to the end of the build plate, and the probe would go outside the end.
This is posted as a reply because the code here is kind of unreadable unless you take time to break it down.
When my brain is cooperating with me again, I would like to expand the probe area toward Xmin and Ymin if we are close to the max edge of the buildplate. That will have to be another day.

;--- Start adaptive mesh probing
; this defines a minimum zise of 60x60 mm grid for probing if your print is too small. if you have placed your print items too near the print bed end, we restrict probe area, so we don't probe outside the print bed.
;TODO: check if we go outside of print bed and expand toward xmin and ymin in stead
M557 X{first_layer_print_min[0]}:{min(max(first_layer_print_max[0], first_layer_print_min[0]+60),print_bed_max[0])} Y{first_layer_print_min[1]}:{min(max(first_layer_print_max[1],first_layer_print_min[1]+60),print_bed_max[1])};define probe area with 20mm between each probe spot
G29 S0 ;start probe, save and activate height map
;--- Stop adaptive mesh probing

@imonsei I forgot to say that when i delay heating the nozzle, it is not suitable for printers that use the nozzle for probing the bed. In this case definitely heat the nozzle before doing probing, so the heat expansion of the metal in the nozzle has had time to happen, and the little plastic at the end of the nozzle doesn't give false Z readings.

EDIT: Silly me forgot that arrays are zero indexed, so before we probed a square that was turned 90 degrees to what it should have been.

Hihi.
I made this little snippet to have your printer only probe the bed in the areas where you have your prints.
I have only tested it on SuperSlicer, but the command fully complies with PrusaSlicer documentation.
You insert this script in your "printer settings" section, in the "start g-code" box.
It should go after you have heated the bed, and after G28, and G32.
This replaces your normal G29 command.

;--- Start adaptive mesh probing
M557 X{first_layer_print_min[0]}:{first_layer_print_max[0]} Y{first_layer_print_min[1]}:{first_layer_print_max[1]} S20  ;define probe area with 20mm between each probe spot
G29 S0 ;start probe, save and activate height map
;--- Stop adaptive mesh probing

I made this for my V-core3.1.
Here is my full start g-code, in case you need it, or have suggestions for improvements.

M115 U3.1.0 ;tell printer latest fw version
M83  ; extruder relative mode

; Heat bed before probing so heat expansion of bed is mostly accounted for
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp

G28                         ; home all
G32                         ; make sure build plate is level. 3 point probe.

;G29 S1                      ;load mesh (disabled because of adaptive mesh probing)
;--- Start adaptive mesh probing
M557 X{first_layer_print_min[0]}:{first_layer_print_max[0]} Y{first_layer_print_min[1]}:{first_layer_print_max[1]} S20  ;define probe area with 20mm between each probe spot
G29 S0 ;start probe, save and activate height map
;--- Stop adaptive mesh probing

; Heating nozzle after probe so we avoid oozing
M104 S[first_layer_temperature] ; set extruder temp
M109 S[first_layer_temperature] ; wait for extruder temp

;---start adaptive purge line
G92 E0.0 ; reset extruder
G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]} Z0.8 F6000.0 ; position 10mm left from the lower left of the first layer
G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]+30} E6 F360.0 ; extrude some filament in the y direction
G92 E0.0 ; reset extruder
G1 X{first_layer_print_min[0]-30} Y{first_layer_print_min[1]+15} E6 F360.0 ; extrude some filament in both the x and y direction
G92 E0.0 ; reset extruder
G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]} E6 F360.0 ; extrude some filament returning back to the start
G92 E0.0 ; reset extruder
;---end adaptive purge line

@deckingman thank you for your explanation much appreciated.

@deckingman That's a bit odd, because in the web interface it shows controls for both, and if i change the one fan slider, it changes the other slider a second later.
Same thing when the gcode changes the fan speed, the web interface's 2 sliders both change.
It also "sounds like" it's changing both, but I could be mishearing it, and I cannot verify visually.
On the web interface on PC is two buttons that switches between the fan you want to change speeds for. Clicking back and forth shows no difference in value. On mobile web interface you can see two sliders, and they both change. Just to make sure I'm describing it properly.
You are correct that it says "tool fan" and "Layer fan".

(I have the newest stable firmware and web control)

I have a duet3 6hc on a v-core printer.

My fans are configured like this:

M950 F0 C"out7" Q500                   ; create fan 0 on pin out3 and set its frequency
M106 P0 C"Hotend Fan" S0 H1 T45 L255   ; set fan 0 name and value. Thermostatic control turned on for Hotend
M950 F1 C"out4" Q500                   ; create fan 1 on pin out4 and set its frequency
M106 P1 C"Layer Fan" S0 H-1		       ; set fan 1 name and value. Thermostatic control is turned off

I have noticed that my slicer's gcode doesn't specify which fan to change speeds on, so both the fans are changing speeds. Is this working as intended?
I would have thought that when you ask the slicer to do more or less cooling on bridges, for instance, it is the layer fan you would like to have fan speed change on?
Is there a way to achieve this?
Also I thought the L255 parameter made the fan for the hotend run at max speed when turned on, so I'm clearly misunderstanding something.

Thanks for your time.

@droftarts
You were correct. I took the motor out of the orbiter and tested. It turned happily when no extruder was attached.
Opened up the planetary gears and did an inspection. Everything looked well lubed and turned easily.
Put it together again, and now it spun as it is supposed to.
Thank you

About the 1.2A - no, it doesn't get hot. It's in the documentation for the unit, so I hope they know what they are doing.

Hi guys.
I got myself a headscratcher I can't really figure out.

My problem is that when I try to extrude, I can extrude about 4mm, and then the motor starts buzzing, and stops extruding/turning. If I then try and retract, I can retract about 4mm and then then the buzzing starts again.

I have this setup
Board: Duet 3 MB6HC (MB6HC)
Firmware: RepRapFirmware for Duet 3 MB6HC 3.4.4 (2022-10-20)

The documentation for the Orbiter 2.0 states the following Gcodes needs to be set for Reprap firmware.
I put them last in the config.g file so I'm sure they will be set, in case I accidentally set something above that could overwrite.
The config.g file is also attached in case there is something relevant.config.g
M350 E16 I1
M92 E690
M203 E7200
M566 E300
M201 E10000
M906 E1200 I10
M572 D0 S0.02
M207 S1.5 F7200 Z0.2

I have heated the nozzle to 200 and have pla on the spool. I can push some through by hand, when pushing in the lever.

The Orbiter 2.0 didn't come with a connector that was correct for the board, so I had to crimp one myself. I'm fairly certain the order of the wires is correct, because it does move the filament forward when i tell it to extrude, and backwards when I retract (until buzz-stop)

Anybody have an idea, or know what I should read up on?

@stephen6309 That worked a treat. Thank you both for your help you are real human beans.