Issues with dual extrusion and Prusaslicer with Duet 2

Turbo

So I recently get my dual extrusion machine up and running, and im having some issues with prusaslicer and duet not playing nice and im not sure why.
For now I'm only using one extruder at a time, but im still having issues that i feel i have only band-aided for now.

When I set the extruder to #2, it begins to heat up extruder #1, unless I preheat extruder #2 before uploading the gcode. I believe this has something to do with the active/standby/off positions but im not sure.
This is my current fix in the start gcode, although I'm pretty sure it won't work for when i need to use both extruders during a print.

M140 S[first_layer_bed_temperature] ; set bed temp
   T[initial_tool] ;
   G10 P[initial_tool] S[first_layer_temperature] ;
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S[first_layer_temperature] ; wait for extruder temp

Can someone help me figure this out?

Danal

For me, it "just works", no special start up G-Code.

Do you have the printer setup in the slicer set to show two extruders?

Turbo

@Danal Yes I do.

Danal

And when loading the STLs (or whatever) to print, you load two of them, and Prusa prompts you to assign them to multiple extruders, and all that Jazz?

Danal

Also, to see if it helps, this is the startup of a file generated by that setup:

; generated by PrusaSlicer 2.0.0+win64 on 2020-03-28 at 00:35:34

; 

; external perimeters extrusion width = 0.45mm
; perimeters extrusion width = 0.45mm
; infill extrusion width = 0.45mm
; solid infill extrusion width = 0.45mm
; top infill extrusion width = 0.40mm

; external perimeters extrusion width = 0.45mm
; perimeters extrusion width = 0.45mm
; infill extrusion width = 0.45mm
; solid infill extrusion width = 0.45mm
; top infill extrusion width = 0.40mm

M73 P0 R606
M107
M190 S60 ; set bed temperature and wait for it to be reached
M104 S215 T0 ; set temperature
M104 S215 T1 ; set temperature
M109 S215 T0 ; set temperature and wait for it to be reached
M109 S215 T1 ; set temperature and wait for it to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
T0
;BEFORE_LAYER_CHANGE
G92 E0.0
;0.3


G1 E-2.00000 F2400.00000
M73 P0 R606
G1 Z0.300 F7800.000
;AFTER_LAYER_CHANGE
;0.3
G1 X123.847 Y112.481
G1 E2.00000 F2400.00000
G1 F1800
G1 X126.618 Y111.154 E0.14773
G1 X129.349 Y110.131 E0.14028
G1 X134.156 Y108.554 E0.24331

Turbo

currently i have not tried a dual extrusion print, i'm just working on using the "secondary" extruder, and not the default. I set the printed piece to extruder 2.

Danal

@Turbo said in Issues with dual extrusion and Prusaslicer with Duet 2:

currently i have not tried a dual extrusion print, i'm just working on using the "secondary" extruder, and not the default. I set the printed piece to extruder 2.

Got it. That should also work...

What do you get that is the dual version of this:

M190 S60 ; set bed temperature and wait for it to be reached
M104 S215 T0 ; set temperature
M104 S215 T1 ; set temperature
M109 S215 T0 ; set temperature and wait for it to be reached
M109 S215 T1 ; set temperature and wait for it to be reached

Turbo

@Danal generating the gcode for mine shows it doesn's define a tool in the m104 codes. /could that be it? i dont want to have to manually change the start gcode every time i change extruders, as i have one .4 nozzle and one .5 nozzle.

the start gcode should still be handling temps correct?

; generated by PrusaSlicer 2.2.0+win64 on 2020-03-29 at 19:11:58 UTC

; 

; external perimeters extrusion width = 0.56mm
; perimeters extrusion width = 0.56mm
; infill extrusion width = 0.56mm
; solid infill extrusion width = 0.56mm
; top infill extrusion width = 0.50mm
; first layer extrusion width = 0.60mm

M107
M280 P3 S160 I1 ; Alarm Release and Push-Pin UP

M572 D0 S0.8
M572 D1 S0.8
;Pressure Advance M572
; D# = Extruder #
; S = K Value (0.2 is start point tune up or down from there (current bowden length about 600mm))

;M104 S210 ; set extruder temp

M140 S60 ; set bed temp
   T1 ; temp fix
   G10 P1 S210 ; temp fix
M190 S60 ; wait for bed temp
M109 S210 ; wait for extruder temp

G28 ; Home Printer
G29 ; run bed compensation script
G1 X10 Y10 Z0.3 F3600 ; Move to front left corner
G92 E0 ; zero extruded length
G1 E10 F300 ; purge blob
G92 E0 ; zero extruded length
G1 X10 Y110 E20 F1800 ; purge line
G92 E0 ; zero extruded length
G1 E-2 F800;

;End of Start.gcode

G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
T1
; Filament gcode
G1 Z0.300 F15000.000
G1 E-2.40000 F1200.00000
G1 X132.692 Y77.794 F15000.000
G1 E2.40000 F1200.00000
G1 F1800.000

Danal

I just tried a single STL, with the extruder "overriden" as shown below. It properly generated everything for Tool1 (Toll 0 is the first, Tool 1 the second, etc). In particular:

M107
M190 S60 ; set bed temperature and wait for it to be reached
M104 S215 T1 ; set temperature
M109 S215 T1 ; set temperature and wait for it to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
T1

I take it that is not what you are seeing?

Turbo

@Danal correct. No Tool defining in the gcode for the temps, unless i add it manually. Is your temp gcode part of your start gcode or is it auto generated?

Danal

It shows up. My "start gcode" box on the printer settings tab is blank.

How are you 'convincing' the slicer to print the one STL on the second extruder? Same as the screenshot above?

Turbo

@Danal Yep. although i think you just helped me solve it. you have no temps in the start gcode? thats where mine differs. ill try removing it and see what happens

Danal

I don't see a set bed temp in your gcode either. Is it further down?

M190

Turbo

@Danal line 26 has bed temp

Danal

Got it. I just missed it with my eye, somehow.

Hmmm.... Let me upgrade to the latest release, I'm on 2.0.0 right now. Be a min or two...

Turbo

Okay so deleting The temps from the start gcode solved it I believe. I have a print running right now, but ill try it afterwards, but the gcode reflects the fix.

Danal

Good. I'm still going to install 2.2, just because

Turbo

@Danal Okay so deleting it kinda fixed it but not really. It does auto add the code for the tool requested, but will try to print before the extruder is up to temp. I dont know why.

Turbo

adding an M109 S[first_layer_temperature] cause it to heat up the wrong extruder

Turbo

Adding an M116 seems to have done the trick, however, i get an error message saying that tool 0 didnt move because it never got up to temp, possibly because it is set as active by default (although im not using is to why even prompt me?), and the second extruder only gets set to active when the standalone T1 command is executed in gcode. I would leave it, but i dont want an error message every print, as it concerns me.