Ender 3 extruder randomly running backwards at the beginning of print

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 over 1 year 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 over 1 year 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?
shabaz over 1 year ago +1

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…

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cstanton over 1 year 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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nowhere2194 over 1 year 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 over 1 year 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 over 1 year 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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nowhere2194 over 1 year 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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gadget.iom over 1 year ago in reply to nowhere2194

Okay. Do you have a filament run-out sensor?
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