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Solved Extruder motor grinding on retraction only...extrudes correctly

Discussion in 'Troubleshooting' started by DJ Sterrett, Jan 25, 2020.

  1. DJ Sterrett

    DJ Sterrett New Member

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    As the title says...i have an old machine that extrudes fine and i can get decent prints but every now and then on retraction the extruder motor makes a grinding noise...anyone got a clue what the deal is?
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Either try bumping the current from the stepper driver for the extruder a bit and see if that helps (or swap the driver for a new one).
    If that doesn't help it is likely the stepper failing.
     
  3. DJ Sterrett

    DJ Sterrett New Member

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    What motor and driver do you recommend?
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  5. DJ Sterrett

    DJ Sterrett New Member

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    Mark you suggested bumping up the voltage on the driver a little i believe...what should that voltage read on a multimeter?
     
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  8. DJ Sterrett

    DJ Sterrett New Member

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    So here is what i have tried.
    1. Bump up the voltage .1v...still grinding
    2. Swap the extruder and another driver...still grinding.

    All i can think is that it must be the motor. Will this motor work?

    Nema 17 Stepper Motor, DROK 40mm High Torque Bipolar DC Step Motor Kit, 0.46Nm Low Noise 42 2-Phrase Universal Electric Motor DC motor for 3D Printer Laser Engraving https://www.amazon.com/dp/B06XSYP24P/ref=cm_sw_r_em_apa_i_5kHlEbAHZEBCQ
     
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    at 65oz-in it is way stronger than the stock one so assuming the size is right for your extruder motor (it should be, but measure it to be sure you have a 42mm body on yours) then it will work fine.
     
  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Swapping the driver for another motor was a good way to test it. I'd say at this point you have a failing stepper.
    You MAY have to adjust the stepper driver current when you install the new one, or maybe not :)
     
  11. DJ Sterrett

    DJ Sterrett New Member

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    Its a moot question... the printer just went up in flames :( at least i was watching it when it happened.
     
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  12. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Well that was non-standard :( Hope you didn't have any other damage.
    and the exact reason I have a smoke detector controlled power strip powering my printers ...
     
  13. DJ Sterrett

    DJ Sterrett New Member

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    Just for proof i'm not full of it...there was no other damage. I picked it up and tossed it out the front door. Like i said im glad i was watching it.
     

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