oscillating standby temperature



  • Hi guys i'm working with two extruders as you can see in the photo, each time that the machine is working with the tool 2, the current temperature of the tool 1 go up, and when the machine has to back to print with the tool1, the process stop until the current temperature in the tool1 turn down to the threshold active temperature.
    I don't have this issue with the current temperature in the tool 2 when it is in standby status.
    Any body knows how can i solve this issue?
    Thankyou!duet image.jpeg



  • @JV Do you mean the "Current temperature"? Because in that screen shot, the "Standby temperature" for both tools is 235.



  • sorry for the mistake.
    the current temperature in the tool 1 when the tool 2 is printing, goes over the active temperature threshold.
    and when the machine has to start printing again with the tool 1, the process stop untill the current temperature in the tool 1 goes down to 235°


  • administrators

    @JV said in oscillating standby temperature:

    the current temperature in the tool 1 when the tool 2 is printing, goes over the active temperature threshold.

    By how much?



  • @dc42 said in oscillating standby temperature:

    By how much?

    when standby temperature is 235°, the current temperature reach 239°


  • administrators

    1. Are you certain that the standby temperature isn't getting increased to 240C at that point?

    2. Are the two heaters closely coupled, so that tool 2 heater is also heating tool 1?

    3. You can try to make heater 1 keep to the setpoint temperature more closely by reducing the D parameter in the M307 parameters for that heater. If you reduce D too much, the temperature will oscillate.



  • thanks David, i'll try to reduce the D parameter , any way the distance between the extruders are 10cm so i don't think that the problem is that the heater 2 is heating the tool1 .
    I check and the standby temperature doesn't change


  • administrators

    @JV are you changing the effect of cooling when the heater moves from active to standby. for example you may turn off the part cooling fan (that is also cooling the heater a bit) when you change to the other tool. that could cause the tool that has just entered standby to see a temp rise before it settles back down to the correct temp.



  • Thanks Tony, i reduced the D parameter as David said from 9.8 to 9.4 and is working better, i'll try to reduce a little bitmore and to see what happen.
    If it doesn't work i'll check the cooling fan.


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