Heater over and undershoots



  • I recently have had issue with my hot end thermistor.
    I have replaced the thermistor and the wild temperature readings have been fixed. But…
    After tuning i get more fluctuation in temperature than prior to the problems. Any tips to calm down the sign wave temperature over and undershooting?


  • administrators

    If the temperature oscillates above and below the target temperature, increase the D parameter in the M307 command. Try a 50% increase.

    If the temperature doesn't oscillate but it overshoots the target temperature during initial heating, increase the A parameter. If it undershoots during initial heating, reduce the A parameter.

    HTH David



  • Thanks. After PID Tuning a second time and setting a larger D value, the fluctuation has been fixed.


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