Sorry i've lost my heatbed !



  • Hello !

    I just came back from holiday and i see the new firmware and new functionality, so i installed the last (1.15B) and i run the auto pid on my hotend successfully and i tested it on a small print, great everything's sounds good ! So i continue with the heatbed (24V on a PCB), it tooks half an hour to achieve but sound ok…
    So new print try and no heatbed warming now ! I just get the message that my heater is not warming enough fast, 2°c/s, i tried to play with M570 but same result.
    I rode the documentation several time and i cannot find what i forget in my config file.
    Could you help me clean those part ? i'm a little lost and confuse on those code part...

    ; Thermistors and heaters
    ;*** You can use S and B parameters to define the parameters of the thermistors you are using
    M305 P0 R4700 H0 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
    ;M305 P1 R4700 H0 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
    ;M305 P1 R4700 T100000 B4388
    M305 P1 X200
    ;M305 P2 R4700 H0 L0 ; Put your own H and/or L values here to set the second nozzle thermistor ADC correction
    M301 H1 P10 I0.10 D100 T0.25 S1.0 ; PID settings for extruder 0
    M307 H0 A363.0 C115.5 D4.9 B0
    M307 H1 A97.1 C526.3 D4.8 B0
    ;M301 H2 P10 I0.10 D100 T0.25 S1.0 ; PID settings for extruder 1
    M570 P1 S12000 ; Increase to allow extra heating time if needed
    M570 P0 S12000 ; Increase to allow extra heating time if needed
    M143 S290

    Thanks !!


  • administrators

    Are you sure you have your M307 H parameters the right way round? You have the gain set to 363 for the bed heater (M307 H0 command) - which is very high for a bed heater - and 97 for the extruder (M307 H1 command) - which if correct means that your extruder will never reach printing temperatures. Similarly, the time constant for your bed heater is rather low, while the time constant for your extruder heater is abnormally high.



  • Maybe something happen while the auto pid but i was able to reach 280 deg without any problem before but i agree with you my heat bed is slow (it's just a spare bed before a silicon model) but it also was able to reach 110 deg..
    I setup the autopid at 110 deg and 0.8 in power, is it a possible problem ?

    I forget that i feel my hotend slower than previously.


  • administrators

    I am sure that your M307 parameters are wrong - the H0 and H1 parameters look the wrong way round to me. A heater with gain 97 will top out at around 120C - which sounds much more like your bed heater than your extruder heater.


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