Extruder motors not working

Discussion in 'Calibration, Help, and Troubleshooting' started by John Mather, Apr 21, 2016.

  1. John Mather

    John Mather Member

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    My build is completed and everything works except the extruder motors (xyz, autohome, both hotends, all the fans, heated bed, z sensor, octoprint... all working perfectly).

    I get no response from either motor using the the machine control and octoprint. I've checked continuity on all of the wires for each motor, and have checked for short circuits between the wires. I also tried unplugging the second extruder motor and plugging it into the Y motor to see if it was the motors themselves (unlikely), and the Y motor did not turn when I controlled extruder 2 (prepare > move axis > .1 > extruder 2).

    Help???

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  2. John Mather

    John Mather Member

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    Forgot to mention that I did already tune the stepper drivers.
     
  3. Alex9779

    Alex9779 Moderator
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    Did you heat up the hotends?
    Marlin is configured that under 170° C no extrusion is possible. It is called "prevent cold extrusion"...
     
  4. John Mather

    John Mather Member

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    That did the trick! Thanks Alex!!!
     
  5. Alex9779

    Alex9779 Moderator
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    BTW sending M302 disables cold extrusion prevention. Then the extruders turn regardless the temperature of the hotend. Should only be used if no filament is loaded...
     
  6. Henry feldman

    Henry feldman Well-Known Member

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    Or we really get a nice NEMA42 stepper that can extrude cold plastic:eek:
     
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  7. Spoon Unit

    Spoon Unit Well-Known Member

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    Or a 1.75mm nozzle ...
     
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