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    Temperature control acting wierd

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    • thomaspj
      thomaspj last edited by

      Here is a clip from during one of my prints that stopped do to a heater excursion:
      0_1548609058161_02164751-929a-4c16-8dae-8527bc51ddff-image.png
      The readings seem to be jittery but its not consistent. Just sometimes during a print this happens. I thought if it was a loose wire on the thermistor then it should be happening consistently and as far as I can tell the thermistor is tightly secured in the heater block. I am using an E3D V6 hotend with the cartridge style thermistor. I am wondering if anyone else has seen this and know why. Also I'm running RepRap firmware 2.02 and the latest Duet Web Control release.

      Thanks

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      • burtoogle
        burtoogle last edited by

        I had a bad e3d v6 thermistor that caused all sorts of print quality issues. Replacing the thermistor solved the problem instantly.

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        • thomaspj
          thomaspj last edited by

          I will try replacing it then. Also it seems to only happen while printing and not when I just set a temp and leave it for like changing filaments or something like that. Maybe its movement induced.

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          • Phaedrux
            Phaedrux Moderator last edited by

            Does it coincide with the part cooling fan coming on? Do you have a silicone sock for the heat block?

            Z-Bot CoreXY Build | Thingiverse Profile

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            • Hornetrider
              Hornetrider last edited by

              HI

              I have something similar, see post:
              https://forum.duet3d.com/topic/8778/troubleshooting-hotend-temp-signal/9

              I have changed the thermistor, some prints like calibration cube work well.
              But now even with heated Hot end performing a G32 or G29 I see the spikes.

              I also tried the G29 with BED off and still bad signals and strange height map with pikes in it. Tried with a clean glas bed and still the same sh..

              Next step, routing a spare cable for the thermistor and test, but I am quite sure this won't help.

              Is there a possibility that the board loads some capacities?

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              • dc42
                dc42 administrators last edited by

                Downward-going spikes in the temperature graph when using a thermistor as the temperature sensor normally indicate a bad connection in the thermistor wiring. Another user just had this problem, see https://forum.duet3d.com/topic/8778/troubleshooting-hotend-temp-signal/14.

                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

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