Automatic Bed Leveling with Conditional Gcode Iterations

A Former User

@Kolbi ref M120 docs; i only used for absolute/relative and feedrate

Kolbi

@bearer Thanks! I'll read the docs again and go for a run to let it soak in.

Kolbi

@bearer said in Automatic Bed Leveling with Conditional Gcode Iterations:

already were in relative mode you would not return to absolute in error

If I'm understanding correctly; If you are in currently in relative positioning and then you issue a G91 again - it would toggle, putting you in absolute positioning?

fcwilt

@Kolbi said in Automatic Bed Leveling with Conditional Gcode Iterations:

@bearer said in Automatic Bed Leveling with Conditional Gcode Iterations:

already were in relative mode you would not return to absolute in error

If I'm understanding correctly; If you are in currently in relative positioning and then you issue a G91 again - it would toggle, putting you in absolute positioning?

G90 sets the mode to absolute. Sending it again changes nothing.

G91 sets the mode to relative. Sending it again changes nothing.

Frederick

Kolbi

Ok, rgr that. So given the following:

M120: Push
Example

    M120
Push the state of the machine onto a stack. Called automatically when a macro file is run. It pushes the following values on the stack:
    Current feedrate
    Extruder positions
    Whether moves (and separately extrusion) are relative or absolute


M121: Pop
Example

    M121
Recover the last state pushed onto the stack.

Could use M120 before issuing any homing related current/sensing changes and then instead of changing them all back via individual commands - just use M121? I'm thinking no, but figure it doesn't hurt to ask.

I guess what I'm trying to figure out and ask is, what exactly is saved in the 'stack'? Also, the documentation states that M120 is called automatically when a macro file is run - I assume this means any gcode file that resides in the macros directory and that this would not apply to files in the sys directory?

BTW, @fcwilt & @bearer Thanks for helping me understand this.

Kolbi

...Maybe if I get one of these, all will be clear

fcwilt

@Kolbi

Hi,

I've never used Push & Pop.

Yes there are places where I switch to relative (G91) and shortly thereafter switch back to absolute (G90) but not that many places, primarily in the homing macros.

If you were to look at all of the .g files in my sys directory the numbers of G90s or G91s would be small in comparison with all the other code.

I've simply never worried about it - I use them as needed.

Frederick

Kolbi

Thanks @fcwilt, much like what you have stated - I have never used M120/1 and haven't had any issues.

But on the other side of the coin, it makes me wonder if I could/should be doing things better by employing it's use? It seems to me, with my limited duet experience, that such command would be most usefully employed by a macro being called while performing an actual print, so that the desired settings set by the slicer would 'pick up where the macro leaves off' & not so important while performing homing evolutions before a print is started.

fcwilt

@Kolbi

I don't rely on the commands my slicer sets at the beginning of a print.

Here is my "print begin" macro called by the slicer at the beginning of a print.

None of those slicer commands matter because my code overrides them all.

; S3D inserts the following 5 lines of code just before calling this file
;G90                                            ; absolute XYZ moves
;M83                                            ; relative E moves
;M106 S0                                        ; fan off
;M140 S60                                       ; bed temp to 60
;M104 S190 T0                                   ; extruder temp to 190

M98 P"test_if_homed.g"				; aborts print if not homed

T0                                              ; select tool 0 so extruder commands below will work
M703                                            ; configure selected filament (sets bed/extruder temps)

M106 P2 S255                                    ; lights on
M106 P3 S255                                    ; lights on
M106 P4 S255                                    ; lights on

G90                                             ; absolute moves
G1 Z75      F1200                               ; position for cleaning
G1 X0 Y-145 F6000                               ; position for cleaning

M291 R"Heating Extruder/Bed" P"Please wait..." T0

M116                                            ; wait for temps to reach set points

M291 R"Priming Extruder" P"Please wait..." T0

G92 E0                                          ; reset the extruder logical position
M83                                             ; extruder relative mode
G1  E10 F120                                    ; prime the extruder
M400                                            ; wait for extruding to finish
G92 E0                                          ; reset the extruder logical position

M291 R"Clean Nozzle and Bed" P"Click OK to begin printing" S3

M98 P"mesh_comp_map_load.g"                     ; load height map based on height map mode

Frederick

Kolbi

@fcwilt Thanks for that info. Could you achieve the same thing by use of start.g? If not the same because timing with regards of being called by the slicer, what does your start.g contain?

Many thanks,
Kolbi

fcwilt

@Kolbi said in Automatic Bed Leveling with Conditional Gcode Iterations:

@fcwilt Thanks for that info. Could you achieve the same thing by use of start.g? If not the same because timing with regards of being called by the slicer, what does your start.g contain?

Many thanks,
Kolbi

I haven't gotten around to determining exactly when start.g executes, just too many things on my plate.

My current system works but I imagine converting it to rely on start.g would not be a problem.

Frederick

Kolbi

@fcwilt said in Automatic Bed Leveling with Conditional Gcode Iterations:

too many things on my plate

I totally understand that. Thanks again for sharing all the info.

Cheers,
Kolbi

Kolbi

I updated the first initial post to give a 'bottom line up front', the two efficient ways that were created to level the gantry, for ease of use.

fcwilt

@Kolbi

Hi,

Normally I invoke PRINT_BEGIN.g and PRINT_END.g from within the slicer using whatever feature the slicer provides.

START.g was called before the call to PRINT_BEGIN.g. That seems to happen automatically without any action on part of Simply3D (S3D).

PRINT_BEGIN.g was called because I invoked it within S3D in the "Starting Script" option on the "Scripts" tab.

STOP.g was not called at all. It seems the slicer must insert a M0 command at the end of the print to invoke STOP.g.

PRINT_END.g was called because I invoked it within S3D in the "Ending Script" option on the "Scripts" tab.

Since I want a "end of print" macro to execute, without a way to force the slicer to include M0 at the end I will stick with the "Script" options and invoke PRINT_BEGIN.g and PRINT_END.g

If would be nice if START.g and STOP.g would execute without any action on the part of the slicer. Then I could dispense with insuring the slicer invokes PRINT_BEGIN.g and PRINT_END.g

Frederick

Kolbi

@fcwilt I understand, thanks!

A Former User

there is also this overview https://duet3d.dozuki.com/Wiki/Macros#Section_System_Macros

fcwilt

@bearer said in Automatic Bed Leveling with Conditional Gcode Iterations:

there is also this overview https://duet3d.dozuki.com/Wiki/Macros#Section_System_Macros

Thanks - I had not seen that.

Frederick

Phaedrux

I use start.g for general print prep. Homing, preheat. Then it passes off to the slicer for setting the temps for the print. Then in the slicer start gcode section it calls a macro to print a prime line and then start the print. I do it this way so that the prime line is printed at the right temp for the material being used.

The slicer end gcode just contains M0 and then stop.g has all of the actual end of print commands.

I kind of wish there was just an end.g that could take the place of M0 -> stop.g

fcwilt

@Phaedrux said in Automatic Bed Leveling with Conditional Gcode Iterations:

Then it passes off to the slicer for setting the temps for the print.

As you may have noticed in my print_begin.g macro I rely on the filament feature to set bed/filament temps.

I do wait for the temps to be reached before starting to print. I don't know what a "prime line" is - I just print a 2 line skirt so I can watch to see how the first layer is going down and adjust baby-stepping or abort, as needed.

Frederick

Phaedrux

@fcwilt said in Automatic Bed Leveling with Conditional Gcode Iterations:

"prime line"

In my case:

;M98 P"0:/sys/PrimeNozzle.g"

G90 			; Absolute positioning
G1 X1 Y270 F6000 	; Move to rear left corner
M400 			; clear movement buffer
M116 			; Wait for temps
G1 Z0.3 F100		; Move Z to prime height
G91 			; Relative positioning
M83 			; Relative extrusion
G1 X40 E10 F300 	; Prime nozzle
G10			; Retract
G1 Y-1 X1 F10000 	; Wipe nozzle
M400

And start.g since we're being transparent.

M106 P2 F30000 S0.5 H-1 C"Duet Fans"
M140 S65		; set heated bed to 65 and release
T0			; Select Tool 0
M291 P"Print Started. Preheating and Homing." T10
G4 S1
M98 P"0:/macros/Musical Tunes/LuckyTune.g" ; Lucky tune to start print off on the right foot
G4 S1
M220 S100		; Set speed factor back to 100% in case it was changed
M221 S100		; Set extrusion factor back to 100% in case it was changed
M290 R0 S0		; clear babystepping
M106 S0			; Turn part cooling blower off if it is on
G10 P0 R0 S80		; Set extruder to 80 and release
M190 S65		; set heated bed to 65 and wait
G28			; home XYZ
G29 S1			; load heightmap
M400
G10 P0 R80 S180	; Set extruder to 180 and release
M98 P"0:/sys/ZSpeedsPrint.g"	; Load Z speeds for printing
M98 P"0:/sys/CurrentsPrint.g"	; Load print motor currents

; Slicer Start Gcode begins.

and stop.g for the hell of it.

; stop.g
; called when M0 (Stop) is run (e.g. when a print from SD card is cancelled)
; Also called by slicer end gcode by M0
;
M400			; Finish move queue
M104 S0 		; Extruder heater off
M140 S0 		; Bed heater off
M106 S255 		; Fan at 100 to cool nozzle and bed
G91			; Relative positioning
M220 S100		; Set speed factor back to 100% in case it was changed
M221 S100		; Set extrusion factor back to 100% in case it was changed
G1 E-2 F9000			; Retract filament 2mm
G1 X5 Y5 F9000		; Wipe nozzle 
G1 Z20 F500			; raise nozzle 5mm from printed part
G90				; absolute positioning
G1 X150 Y130 F6000		; Move x and Y axis over to bed center so probe is on top of bed
;M104 S35		; Set hot end low and wait
G4 S60			; Wait 5 minutes
;M116			; wait for temp to drop
G28 X Y			; Home X and Y
G28 X Y			; Home it again, Sam.
M290 R0 S0		; clear babystepping
M84			; Steppers off
M98 P"ZSpeedsNormal.g"	; Load normal z speed settings again.
M106 S0			; Fan off
M106 P2 F30000 L0.1 X0.8 B0.5 T35:70 H100:101:102 C"Duet Fans"

;Play a little beep beep beep to show print ended.
M400			; Clear queue again before jingle
G4 S1
M300 P250 S750
G4 P251
M300 P200 S1250
G4 P201
M300 P250 S750
G4 P251
M300 P200 S1250
G4 P201
M300 P250 S2500
G4 P251
M300 P150 S2000
G4 P151
M300 P150 S2500
G4 P151
M300 P350 S3700
G4 P351