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    Hotend fan shutting off too early

    My Duet controlled machine
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    • akuma211
      akuma211 last edited by

      Hello, I have a Duet2wifi installed on a MP Delta pro.

      I have most of the kinks worked out, but this one is my biggest problem right now.

      As soon as the print finishes, the heater shuts off and the printer homes away from the print, which is what I want, BUT, the hotend fan will also shut off, before it's cooled down, creating the chance of clogs.

      I was using fan 0 for the HE, I read someone suggesting to use the parts cooling fan in fan 0, and H0 cooling fan in the other slots, so I did that, updated the changes through configurator, still shutting off after the print too early.

      Could it be something in my end gcode on the slicer?

      1 Reply Last reply Reply Quote 0
      • Veti
        Veti last edited by

        post you config.g

        1 Reply Last reply Reply Quote 0
        • akuma211
          akuma211 last edited by

          ; Configuration file for Duet WiFi (firmware version 3)
          ; executed by the firmware on start-up
          ;
          ; generated by RepRapFirmware Configuration Tool v3.1.8 on Tue Nov 24 2020 23:22:55 GMT-0800 (Pacific Standard Time)

          ; General preferences
          G90 ; send absolute coordinates...
          M83 ; ...but relative extruder moves
          M550 P"Delta Pro" ; set printer name
          M665 R195.69 L283.2 B135 H335 ; Set delta radius, diagonal rod length, printable radius and homed height
          M666 X0 Y0 Z0 ; put your endstop adjustments here, or let auto calibration find them

          ; Network
          M552 S1 ; enable network
          M586 P0 S1 ; enable HTTP
          M586 P1 S0 ; disable FTP
          M586 P2 S0 ; disable Telnet

          ; Drives
          M569 P0 S0 ; physical drive 0 goes backwards
          M569 P1 S0 ; physical drive 1 goes backwards
          M569 P2 S0 ; physical drive 2 goes backwards
          M569 P3 S1 ; physical drive 3 goes forwards
          M584 X0 Y1 Z2 E3 ; set drive mapping
          M350 X128 Y128 Z128 E128 I0 ; configure microstepping without interpolation
          M92 X640.00 Y640.00 Z640.00 E3326.01 ; set steps per mm
          M566 X1200.00 Y1200.00 Z1200.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
          M203 X18000.00 Y18000.00 Z18000.00 E18000.00 ; set maximum speeds (mm/min)
          M201 X3000.00 Y3000.00 Z3000.00 E9000.00 ; set accelerations (mm/s^2)
          M906 X1000 Y1000 Z1000 E2000 I30 ; set motor currents (mA) and motor idle factor in per cent
          M84 S30 ; Set idle timeout

          ; Axis Limits
          M208 Z-12 S1 ; set minimum Z

          ; Endstops
          M574 X2 S1 P"!xstop" ; configure active-high endstop for high end on X via pin !xstop
          M574 Y2 S1 P"!ystop" ; configure active-high endstop for high end on Y via pin !ystop
          M574 Z2 S1 P"!zstop" ; configure active-high endstop for high end on Z via pin !zstop

          ; Z-Probe
          M558 P5 R1 C"!zprobe.in+zprobe.mod" H5 F1200 T3600 ; set Z probe type to effector and the dive height + speeds
          G31 P800 X0 Y0 Z-0.15 ; set Z probe trigger value, offset and trigger height
          M557 R135 S20 ; define mesh grid

          ; Heaters
          M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
          M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
          M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
          M140 H0 ; map heated bed to heater 0
          M143 H0 S100 ; set temperature limit for heater 0 to 100C
          M308 S1 P"e0temp" Y"thermistor" T500000 B4723 C1.19622e-7 ; configure sensor 1 as thermistor on pin e0temp
          M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
          M307 H1 B0 S1.00 ; 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"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
          M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
          M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
          M106 P1 S0 H-1 ; set fan 1 value. Thermostatic control is turned off
          M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
          M106 P2 S1 H1 T45 ; set fan 2 value. Thermostatic control is turned on

          ; Tools
          M563 P0 S"Part Cooling" D0 H1 F0:1:2 ; 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
          G29 S ; Load height map from file

          ; Miscellaneous
          M501 ; load saved parameters from non-volatile memory
          M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

          deckingman 1 Reply Last reply Reply Quote 0
          • deckingman
            deckingman @akuma211 last edited by deckingman

            @akuma211 You defined fans 0 and 1 as non-thermostatic part cooling fans and fan 2 as the hot end heat sink cooling fan which is set to run thermostatically with heater 1. So far so good. But then you've mapped fans 0,1 and 2 to tool 1 such that all 3 will be treated as part cooling fans - not so good.

            So change this line...........
            M563 P0 S"Part Cooling" D0 H1 F0:1:2 ;

            to this ..........
            M563 P0 S"Tool 0" D0 H1 F0:1 ; or whatever name you want the tool to be -"part cooling" is not a good name for a tool which has an extruder drive and a heater associated with it as well as fans.

            The important thing is that you remove Fan 2 from that M563.

            akuma211 1 Reply Last reply Reply Quote 2
            • akuma211
              akuma211 @deckingman last edited by

              @deckingman

              Thank you!
              I'll update my settings and do a test print!

              deckingman 1 Reply Last reply Reply Quote 0
              • deckingman
                deckingman @akuma211 last edited by

                @akuma211 To elaborate, the firmware will take any M106 commands that are in a slicer gcode file, and apply them to any fans that are associated with a tool as if those fans are part cooling fans. So what is likely to have happened is that you slicer end code has an M106 S0 which will turn off any and all part cooling fans, and because you had mapped fan 2 (as well as fans 0 and 1) to the tool, then that M106 S0 will turn off all 3 fans.

                1 Reply Last reply Reply Quote 2
                • akuma211
                  akuma211 last edited by

                  @deckingman that explains what happened. I was having trouble with the part cooling fans early in the install, turned out I didn't crimp the wire correctly on, and I was messing with the config files.

                  I remember changing that section in config trying to get the fan working, and now you showed me what it affected lol.

                  Appreciate the help fixing it. Now I see myself looking at the smart effector, instead of the nozzle tip piezo sensor, this hobby is never ending lol

                  1 Reply Last reply Reply Quote 0
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