24v Hemera overheating?

Discussion in 'HotEnds & Extruders' started by Wannageering, Dec 15, 2019.

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  1. Wannageering

    Wannageering Member

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    Hi, I installed my Hemera on a 24v Hypercube Evolution (I did order the 24v version)
    Printing starts perfect, but after a while the stepper/heatbreak gets so hot that the filament melts and grinding occurs, until it stops extruding at all.
    Filament settings: PETG, 240 hotend 80 bed.
    At first I thought it was retractions, so I disable them but that did not help.
    Esteps and other settings have been put into the Reprap firmware.
    Running as low as 650mA for the stepper still gets the Hemera scorching hot (unable to touch).
    Heatbreak fan is running fine.

    Help?
     
  2. Greg Holloway

    Greg Holloway Administrator
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    does it get very hot if the hotend isnt turned on and the motor is left at idle?
     
  3. Wannageering

    Wannageering Member

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    Hi Greg, no only when the hotend is heated.
    I did some further testing, with PLA 205/60 degrees and some extra fans this time, and I succeeded in the first benchy.
    This one looked quite bad on overhangs (never even got that far before) which led me to taking the volt meter and I think I have found the problem - my Duet fan jumper was set to 5V instead of VIN (24V)... So further testing is ongoing, this time with 24V ;-)
     
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  4. Greg Holloway

    Greg Holloway Administrator
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    That'll do it :)
     

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