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Solved Temp fell too much error leading to hotend help

Discussion in 'Troubleshooting' started by MinnesotaFats, Dec 30, 2021.

  1. MinnesotaFats

    MinnesotaFats New Member

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    Let's see if I can give you all the information. I have a Robo 3d R1 from right after the Kickstarter ended. It has an E3D V5 hotend. It had been sitting for about 4 years since I didn't have a permanent location to place it. I recently moved and now have it out and have been making some changes, new fans, T8.8 Acme lead screws, moving to Cura, herringbone gear, etc. While making those changes I ran into the dreaded "temp fell too much" error. After digging into it I ended up figuring out the thermistor is shot and the heater cartridge could stand to be replaced.

    Now, I am not super savvy with this stuff and am just not certain what to get. Could you make some recommendations on replacements. Since I am in the process of making this a little bit better, are there better heater cartridges I could look into? The thermistor I have is very small and looks quite fragile, is there a better one available? Thank you for any help you can provide.
     
    #1 MinnesotaFats, Dec 30, 2021
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Heater cartridges are a standard size and come in several wattages.
    The v5 E3D uses a glass bead thermistor and yes it is a small (fragile) glass ball.

    You can find them in many places. The thermistor type needs to be 100kohm.

    Examples (not suggestions):

    Heater core:
    https://www.amazon.com/6-35mm-Ceramic-Cartridge-Printer-Extruder/dp/B071K8Z9KF

    Thermistor:
    https://www.amazon.com/Gikfun-Semitic-104GT-2-Thermistor-Printer/dp/B00UFBIRVI
    Read the comment on this thermistor there on the Amazon page -- it does not have the shielding so you have to use Kapton tape (which you can also find on Amazon) to wrap the wires and prevent them shorting. Or use a non-E3D thermistor type:

    https://www.amazon.com/Quluxe-Thermistor-Temperature-100K3950-Thermistors/dp/B08DFM3DGC

    already shielded.

    If you end up using a non-E3D thermistor you will want to make sure you have the correct type defined in the firmware (configuration.h) because the E3D is ATC Semitec 104GT-2 thermistor (type 5 in marlin) -- the one I listed above as NON-E3D is a Marlin type 11
     
    #2 mark tomlinson, Dec 31, 2021
  3. MinnesotaFats

    MinnesotaFats New Member

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    #3 MinnesotaFats, Dec 31, 2021
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Totally fine. You will end up with a 1/2 v5 and 1/2 v6 E3D :) Should still work fine.
    I haven't checked but the v6 heater block and parts should fit on an E3D v5 heat break.
    I still use the v5 on one of my beta machines.
     
    #4 mark tomlinson, Dec 31, 2021
  5. MinnesotaFats

    MinnesotaFats New Member

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    Fantastic! I think I'm going to head that direction. Again, thanks for the replies.
     
    #5 MinnesotaFats, Dec 31, 2021

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