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    Thermostatic fan control on 2 hotends (Chimera)

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    • oseiler
      oseiler last edited by oseiler

      I've set my hotend cooling fan to turn on at 50 degrees for H1 or 2 for printing with the Chimera (1 fan for both hot ends)
      M106 P0 S255 H1:2 T50

      Now when I use a single hotend on my printer, the second thermistor is not connected the fan will be always on. I think this might be because on the display the temperature for the second hotend is reported at 2000 degrees.

      The firmware must know that the second thermistor isn't connected, because t doesn't report an error (as opposed to when using both hotends and unplugging the second which is detected and flagged). Is there a way to configure the fan to ignore the H2 temperature when H2 is not connected?

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      • dc42
        dc42 administrators last edited by

        Are you switching between 2 different hot ends? If so then on the connector for the single hot end, you could fit a 100k resistor in place of the second thermistor.

        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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        • oseiler
          oseiler last edited by

          I'm using different carriages with either the single E3D V6 or Chimera. Plugging a resistor into the unused plug when I'm not using the Chimera should work and I'll give it a try.

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          • oseiler
            oseiler last edited by

            I've made a little plug with a 100k resistor that I use when only using 1 hotend and it works perfectly well (temp is reported at 24 .5 degrees).
            Thanks for the adivce 🙂

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