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Extruder Heating Fault only during printing ABS

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  • undefined
    infamous_panda
    last edited by 22 Jan 2019, 21:04

    0_1548190364035_Capture.JPG

    Recently re-converted my Tevo Little Monster's MKS board to an M3D Duet Maestro. I went down this path a few months back only to return the board due to the random short to ground issues. The Maestro is back in and I have done maybe 12 hours of PLA printing without issue. I print this at 200°C

    I have been trying all day to print ABS at 235° and have immediately been getting extruder heating faults once I start printing. The temperture is highly erratic jumping +/-30°C within a few seconds.

    Once I switch back to printing PLA at 210° the machine runs fine and temperatures are stable.

    Some notes:

    1. I mostly print ABS and the machine has hundreds of hours doing so with the stock board. I did not change the slicer settings. The part cooling fan is not turned on at all.

    2. I can manually heat the extruder to 235° and extrude out a glob of filament at various speeds temperature is stable within 2°

    3. My loading and changing filaments at 235° is fine. temperatures are stable within 2°

    4. The issue seems to happen if the machine is running a print job. Then the temperature reading is more erratic.

    Checked the connections and they seem fine but given the above this seems to be a firmware issue?

    Where to start?

    undefined 1 Reply Last reply 23 Jan 2019, 08:51 Reply Quote 0
    • undefined
      infamous_panda
      last edited by 22 Jan 2019, 21:48

      Possibly relevant info

      in config.g

      ; Heaters
      M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
      M305 P0 T100000 B4138 C0 R2200 ; Set thermistor + ADC parameters for heater 0
      M143 H0 S120 ; Set temperature limit for heater 0 to 120C
      M305 P1 T100000 B4138 C0 R2200 ; Set thermistor + ADC parameters for heater 1
      M143 H1 S285 ; Set temperature limit for heater 1 to 285C

      1 Reply Last reply Reply Quote 0
      • undefined
        Phaedrux Moderator
        last edited by 22 Jan 2019, 22:08

        Things that come to mind.

        Have you done a PID tune? Was the cooling fan active during the tuning, but now absent printing ABS?

        Are you sure you have the right values for configuring the thermistor?

        Do you have any values being overridden by config-override.g?

        Are you sure the thermistor is firmly secured?

        Z-Bot CoreXY Build | Thingiverse Profile

        1 Reply Last reply Reply Quote 0
        • undefined
          infamous_panda
          last edited by 23 Jan 2019, 03:56

          Thank you. The PID tune seems to have done the trick. Temps are stable now. I am surprised that it made a big difference.

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          • undefined
            dc42 administrators @infamous_panda
            last edited by 23 Jan 2019, 08:51

            @infamous_panda said in Extruder Heating Fault only during printing ABS:

            The temperture is highly erratic jumping +/-30°C within a few seconds.

            That usually indicates a wiring problem.

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

            undefined 1 Reply Last reply 23 Jan 2019, 14:21 Reply Quote 0
            • undefined
              infamous_panda @dc42
              last edited by 23 Jan 2019, 14:21

              @dc42 Yes that was my first assumption. As far as I can tell, the connections are good. I ran PLA 190°C and ABS 235°C back to back. The PLA ran fine for hours, where the ABS would fail within seconds of starting the print. If it were wiring I assume that it would be erratic for both situations. Also it would be erratic when changing filaments (240°C). The issue only occured during printing.

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