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3D Printing
3D Printing Forum Ender 3 extruder randomly running backwards at the beginning of print
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  • filament spool
  • ender3
  • 3D Printing
Related

Ender 3 extruder randomly running backwards at the beginning of print

nowhere2194
nowhere2194 over 2 years ago

I have an ender 3 that sometimes will just randomly pull all the filament out at the beginning of the print. I have been just stopping the print, resetting the filament, and restarted the print and it works fine. what could be going wrong? any ideas

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  • Fred27
    Fred27 over 2 years ago +2
    What do you mean by "randomly pull all the filament out"? It's normal for some to ooze out as the nozzle heats up. The printer will then "wipe its nose" at the side of the build platform before starting…
  • dougw
    dougw over 2 years ago +2
    Some printers have a "change filament" command that ejects the filament. It sounds like this command is somehow being executed. Is there a menu option for this command?
  • robogary
    robogary over 2 years ago +1
    Not sure root cause, but I'd recommend doing basic maintenance to see if that fixes the problem - teardown the extruder, meticulously clean out all the filament pathways including the nozzle (maybe even…
  • shabaz
    shabaz over 2 years ago

    No idea, but I'm going to guess that the filament isn't sufficiently heated the first time around, causing the stepper motor to miss steps. A poor stepper motor driver may then result in the motor spinning in the reverse direction. 

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  • Fred27
    Fred27 over 2 years ago

    What do you mean by "randomly pull all the filament out"? It's normal for some to ooze out as the nozzle heats up. The printer will then "wipe its nose" at the side of the build platform before starting the print. I doubt you mean that though. Maybe a video would help.

    To be honest though, 3D printing seems to always involve something randomly going wrong. If that happens occasionally then you're probably doing it right. Wink

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  • robogary
    robogary over 2 years ago

    Not sure root cause, but I'd recommend doing basic maintenance to see if that fixes the problem - teardown the extruder, meticulously clean out all the filament pathways including the nozzle (maybe even replace nozzle if old) , wiggle and reseat all the extruder connections. 

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  • dougw
    dougw over 2 years ago

    Some printers have a "change filament" command that ejects the filament. It sounds like this command is somehow being executed. Is there a menu option for this command? 

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  • cstanton
    cstanton over 2 years ago

    nowhere2194 

    1. What software are you using to produce the gcode your printer's using?

    2. What's the GCode look like that you're using for the print? Would you share it?

    3. Does the slicer software you're using have a 'start up' gcode that may be messing with this?

    4. What's practically happening when this occurs? Are you able to take steady video footage and share it?

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  • gadget.iom
    gadget.iom over 2 years ago in reply to cstanton

    This information would be really helpful. 

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  • nowhere2194
    nowhere2194 over 2 years ago in reply to cstanton

    Cura slicer, standard 0.2mm settings, no changes to start up, I'll work on getting some footage

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  • gadget.iom
    gadget.iom over 2 years ago in reply to nowhere2194

    I use Cura on an Ender3.  Haven’t personally experienced this issue.  Are you using the stock Marlin firmware provided with the printer?

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  • nowhere2194
    nowhere2194 over 2 years ago in reply to Fred27

    The extruder will run in opposite direction pulling the filament from the hot end.

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  • nowhere2194
    nowhere2194 over 2 years ago in reply to gadget.iom

    I have flashed the firmware to TH3D. I know someone else with the exact same setup and has not had this issue.

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