Start Gcode "Trying to extrude with no tool selected"

blt3dp

I'm working on getting a little more automation in my start gcode. My workflow goes like this.

Power on printer
2 Run a macro that homes the towers (delta printer), moves to center of bed, Z5. Puts the bed to standby temp of 60, nozzle standby temp of 130. Does a G30 and then a G32. Then lifts the nozzle center of bed, Z300. This leaves the heaters in standby temps.
Send a gcode sliced with PrusaSlicer with the below start gcode

M107 ; turn off part cooling fan incase PrusaSlicer doesn't
M568 P0 R0 S0 A0 ; set turn off tool 0
G90 ; send absolute coordinates
M220 ; set movement feed to 100 percent
G28 X ; home x axis first
G28 Y ; home y axis second
G28 Z ; home z axis last
G1 Z25 F1800 ;E move nozzle to Z25
G1 X0 Y-55 F1800 ;E move nozzle to X0 Y-55
M140 P0 R0 S{first_layer_bed_temperature[0]} ; heat bed to first layer temperature
M116 ; wait for bed to reach temperature
M568 P0 R0 S{first_layer_temperature[0]} A2 ; set hotend to first layer temperature
M116 ; wait to reach temperatures
M221 ; reset extruder flow to 100 percent
G92 E0 ; zero the extruder
G1 E5 F2400 ; unretract filament from previous print end retraction
G92 E0 ; zero the extruder
G1 E20 F300 ; purge filament 20mm
G92 E0 ; zero the extruder
G1 Z{first_layer_height} F1800 ;E slowly go to first layer height

I'm having with the section starting with the first G92. It's intended to unretract the filament from the retract at the end of a print and then purge 20mm of filament.

But it's not doing either of those and it's giving me message in the console saying that it's unable to extrude with no tool selected. Yet the second M568 sets Tool 0 to active and to printing temp.

And when it gets to the actual print, it extrudes just fine

I think this is due to the fact that if PrusaSlicer doesn't see an M104 in the start gcode, it will do add it on it's own before the start gcode. Which is why I have the first M568, I don't want it to do that until after the bed reaches temp cause it takes longer so I turn the nozzle off immediately.

I'd also rather not set tool 0 active in config.g as I'd prefer it not to be active just in case temps were set without me knowing.

Any ideas on what I'm doing wrong here. Here's my config.g and the beginning of a gcode

; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Fri Jun 03 2022 11:21:39 GMT-0700 (Pacific Daylight Time)

; General preferences
G90                                                    ; send absolute coordinates...
M83                                                    ; ...but relative extruder moves
M550 P"Voron 0.1"                                      ; set printer name
M669 K1                                                ; select CoreXY mode

; Network
M552 P192.168.1.101 S1                                 ; enable network and set ip address
M553 P255.255.255.0                                    ; set netmask
M554 P192.168.1.1                                      ; set gateway
M586 P0 S1                                             ; enable HTTP
M586 P1 S0                                             ; disable FTP
M586 P2 S0                                             ; disable Telnet

; Drives
M569 P0.0 S1                                           ; physical drive 0.0 goes forwards
M569 P0.1 S1                                           ; physical drive 0.1 goes forwards
M569 P0.2 S1                                           ; physical drive 0.2 goes forwards
M569 P0.3 S1                                           ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E0.3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                                ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E570.00                      ; set steps per mm E562.00
M566 X360.00 Y360.00 Z30.00 E720.00                    ; set maximum instantaneous speed changes (mm/min) # Research Extruder Speed Change, Previous 360.00
M203 X12000.00 Y12000.00 Z900.00 E600.00               ; set maximum speeds (mm/min) # Research Extruder Speed, Previous 12000.00
M201 X2000.00 Y2000.00 Z45.00 E2000.000                ; set accelerations (mm/s^2) # Resarch Extruder Acceleration, Previous 200.00
M906 X650 Y650 Z650 E550 I30                           ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                                ; Set idle timeout

; Axis Limits
M208 X-59.75 Y-55 Z0.1 S1                              ; set axis minima
M208 X59.75 Y64 Z110 S0                                ; set axis maxima

; Endstops
M574 X2 S1 P"io1.in"                                   ; configure switch-type (e.g. microswitch) endstop for high end on X via pin io1.in
M574 Y2 S1 P"io2.in"                                   ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin io2.in
M574 Z1 S1 P"io3.in"                                   ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin io3.in

; Z-Probe
M558 P0 H5 F300 T12000                                 ; disable Z probe but set dive height, probe speed and travel speed
M557 X20:100 Y20:100 S20                               ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B3950           ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                                     ; create bed heater output on out0 and map it to sensor 0
M307 H0 R0.535 K0.442:0.000 D3.99 E1.35 S1.00 B0       ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                                ; map heated bed to heater 0
M143 H0 S120                                           ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4725 C7.06e-8  ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                                     ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 R4.664 K0.926:0.000 D1.00 E1.35 S1.00 B0       ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                           ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"out5" Q5000                                    ; create fan 0 on pin out5 and set its frequency
M106 P0 S0 B5.0 H-1                                    ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out6" Q500                                   ; create fan 1 on pin out6 and set its frequency
M106 P1 S1 H1 T45                                      ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                                       ; define tool 0
G10 P0 X0 Y0 Z0                                        ; set tool 0 axis offsets
G10 P0 R0 S0                                           ; set initial tool 0 active and standby temperatures to 0C

; Custom settings
M207 S1.0 F2400 Z0.4                                     ; set firmware retraction length, speed and z-lift

; Miscellaneous
M918 P2 E-4 F2000000 C30 R6                            ; configure direct-connect display
M150 X2 R255 U255 B255 S3                              ; set all 3 LEDs to white
M911 S21.9 R22.9 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

M107
M104 S245 ; set temperature
;TYPE:Custom
M107 ; turn off part cooling fan incase PrusaSlicer doesn't
M568 P0 R0 S0 A0 ; set turn off tool 0
G90 ; send absolute coordinates
M220 ; set movement feed to 100 percent
G28 X ; home x axis first
G28 Y ; home y axis second
G28 Z ; home z axis last
G1 Z25 F1800 ;E move nozzle to Z25
G1 X0 Y-55 F1800 ;E move nozzle to X0 Y-55
M140 P0 R0 S110 ; heat bed to first layer temperature
M116 ; wait for bed to reach temperature
M568 P0 R0 S245 A2 ; set hotend to first layer temperature
M116 ; wait to reach temperatures
M221 ; reset extruder flow to 100 percent
G92 E0 ; zero the extruder
G1 E5 F2400 ; unretract filament from previous print end retraction
G92 E0 ; zero the extruder
G1 E20 F300 ; purge filament 20mm
G92 E0 ; zero the extruder
G1 Z0.2 F1800 ;E slowly go to first layer height
M109 S245 ; set temperature and wait for it to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
; Filament gcode
M107
;LAYER_CHANGE
;Z:0.2
;HEIGHT:0.2
;BEFORE_LAYER_CHANGE
;0.2


G1 Z.2 F12000
;AFTER_LAYER_CHANGE
;0.2
G10 ; retract
G1 X17.78 Y-43.621
G11 ; unretract
M204 S2000
;TYPE:Skirt/Brim
;WIDTH:0.44
G1 F900
G1 X44.878 Y-32.575 E.96618
G1 X45.681 Y-32.115 E.03055
G1 X46.552 Y-31.328 E.03875
G1 X47.251 Y-30.269 E.04191
G1 X47.538 Y-29.535 E.02601
G1 X47.749 Y-28.123 E.04713
G1 X47.749 Y-15.123 E.42922
G1 X47.391 Y16.654 E1.04927
G1 X47.293 Y17.508 E.02836
G1 X41.125 Y45.541 E.94772
G1 X39.895 Y47.704 E.08215

deckingman

@blt3dp said in Start Gcode "Trying to extrude with no tool selected":

.................... This leaves the heaters in standby temps.

................... it's giving me message in the console saying that it's unable to extrude with no tool selected. Yet the second M568 sets Tool 0 to active and to printing temp.

M568 sets the active and standby temperatures for the tool but it does not make the tool active. You need to select a tool first by issuing a "Tn" command. If you only have one tool then that would be "T0" and the easiest thing to do is put that T0 at the end of your config.g file. Better still, use T0 P0 which will suppress any tool change macros should you have them.

blt3dp

@deckingman I might be a little confused on the documentation, the A2 parameter seems to make Tool 0 active as shown in DWC. But I suppose a tool can be set to active state and heated up, but not selected?

deckingman

@blt3dp Yes it is a tad confusing. M568 (or the older, deprecated G10) will set the active temperature but not the active state, which is a different thing. Think of it like this, when a tool is selected using a Tn command, then the temperature of that tool will rise to the active temperature that was previously set using M568. When it is deslected, temperature will drop to the standby temperature that was set using M568. The A parameter is new in rrf 3.3 but they way I read it is that it simply allows one to set the active (and standby) temperature of a different tool to that which is currently in use, but still does not change the active/ inactive state.

It may seem overly complicated if you only have a single tool but it is necessary when you have multiple tools and wish to rapidly switch between them.

blt3dp

@deckingman I reread it with a clearer mind. Now I understand the tool and heater are separate. M568 A parameter can activate the heater on a tool to whichever state, but not select it for printing. I added the proper T0 P0 to start gcode and T-1 P0 to the end. Everything is working as I'd like, thanks.