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Answered Hotend not strong enough to heat up when fan comes on.

Discussion in 'Troubleshooting' started by Oisin, Oct 12, 2016.

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  1. Oisin

    Oisin Member

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    I recently upgraded my part fan to a 20CFM one to compensate for the fact I can now only fit one on my printer due to installing an IR sensor.

    I tested a print for the first time today and as soon as layer 2 began and the fan came on, the hotend temperature dropped from 190C to 166C and never recovered. Extrusion stopped because of the limit in the firmware and even if it hadn't the PLA wouldn't have melted anyway.

    Is there any way I can combat this? Or will I have to not run my fan at 100%?
     

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    #1 Oisin, Oct 12, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    1) Print a new fan mount that aims the parts fan at the printed part and not at the nozzle.
    2) Buy a larger heater core. The hex has a 30w, the E3D a 25w, but a 40w core will work fine and not have the issues maintaining temperature.
     
    #2 mark tomlinson, Oct 12, 2016
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  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    P.S. I upgraded all of mine to 40w cores (they cost a couple of dollars US each on Amazon or other retailers).
     
    #3 mark tomlinson, Oct 12, 2016
  4. Oisin

    Oisin Member

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    I attempted to increase the temperature after it fell. The print cancelled and I got the following error message:

    Recv: Error:Heating failed, system stopped! Heater_ID: 0
    Changing monitoring state from 'Printing' to 'Error: Heating failed, system stopped! Heater_ID: 0
    '
    Recv: Error:printer halted. kill() called!
    Changing monitoring state from 'Error: Heating failed, system stopped! Heater_ID: 0
    ' to 'Offline'
    Connecting to: /dev/ttyACM0
    Changing monitoring state from 'Offline' to 'Opening serial port'
    Connected to: Serial<id=0x280a970, open=True>(port='/dev/ttyACM0', baudrate=250000, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
    Changing monitoring state from 'Opening serial port' to 'Connecting'
    Send: N0 M110 N0*125
    Connection closed, closing down monitor
    There was a timeout while trying to connect to the printer
    Changing monitoring state from 'Connecting' to 'Offline'
    Connection closed, closing down monitor
    Connecting to: /dev/ttyACM0
    Changing monitoring state from 'Offline' to 'Opening serial port'
    Connected to: Serial<id=0x2b34310, open=True>(port='/dev/ttyACM0', baudrate=250000, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
    Changing monitoring state from 'Opening serial port' to 'Connecting'
     
    #4 Oisin, Oct 12, 2016
  5. Oisin

    Oisin Member

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    Damn! Yet more money to be spent. Hopefully I can get one that fits in the V6. I use the fan mount in the images below. Only the tip of the nozzle peeks below the vents.
     

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    #5 Oisin, Oct 12, 2016
  6. danzca6

    danzca6 Well-Known Member

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    The extruder is still not keeping up. I would do what Mark suggested and get the 40W heater core for it. In the meantime, you can lower your fan speed for now to get whatever you are printing done. Ultimately, new shroud to better direct the air and the new heater core is going to be your answer.
     
    #6 danzca6, Oct 12, 2016
  7. danzca6

    danzca6 Well-Known Member

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    WOW! That new fan mount kills your Z height potential. You can mount the IR on the side of the carriage as well. That is where I have mine and still have dual fans.
     
    #7 danzca6, Oct 12, 2016
  8. Oisin

    Oisin Member

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    It kills whatever was left alive after the cable chain! I just thought it would be good for getting airflow directly on the part since overhangs have always been terrible for me.
     
    #8 Oisin, Oct 12, 2016
  9. Oisin

    Oisin Member

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    Okay. Ordered the E3D V6 upgrade kit that has a silicone sock and also a 40W heater cartridge. Hopefully I'll be good to go after that. I'll look in to printing a better fan shroud so I can regain some z-axis height.
     
    #9 Oisin, Oct 12, 2016
  10. danzca6

    danzca6 Well-Known Member

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    Oh yeah the sock will help a lot with keeping temp and keeping clean.
     
    #10 danzca6, Oct 12, 2016
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    While I love the E3D you could have just spent a small amount on a new heater core first :)

    If you can swing it, the E3D is a fine upgrade. Good luck.
     
    #11 mark tomlinson, Oct 12, 2016
  12. Oisin

    Oisin Member

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    I'm already running the E3D V6 :D I haven't used the Hex hotend for years. I only bought the upgrade pack for the V6 and the 40W core.
     
    #12 Oisin, Oct 12, 2016
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  13. Oisin

    Oisin Member

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    Also, I won't need to change anything in the firmware will I?
     
    #13 Oisin, Oct 12, 2016
  14. danzca6

    danzca6 Well-Known Member

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    Nope
     
    #14 danzca6, Oct 12, 2016
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  15. Oisin

    Oisin Member

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    Nice. Thanks for the help guys!
     
    #15 Oisin, Oct 12, 2016
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