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Mar 2019

The stepper motor does not run smoothly, it will rotate on its own when it is not installed, but it has a very jerky motion. It’s a new motor, and the old motor does the same thing when connected to that cable.

The filament does not get chewed up and the and there hasn’t been anything wrong with the temperatures. (I installed my hot end on another printer, and it worked fine) The motor doesn’t seem to have enough strength to push the filament through, it is unable to strip the plastic off the filament. It twitches back and forth when it hits any resistance. The hot end is also completely clear of all plastic debris.

It actually was the drivers! I switched them out the first time, using the newer motor I had, and nothing different happened. When I switched to the motor that came with the printer, and then switched the drivers, it started extruding plastic perfectly. Thanks for the help.

I experienced something very similar, mine was harder to track down as it would only occur occasionally during prints. My printer would start out fine, then some time during the print my extruder would start jerking like you described. I thought it was temperature so I added active cooling, which did not help, I finally tracked it down to the plug on the end on the cable where it plugs into the stepper. The way mine is set up the flexing over time wore it out, and instead of trying to order a new one from china, and possibly having the issue again, I opened up the stepper and hard wired the cable, then built in a little strain relief using the case of the stepper itself. That was probably close to a year ago, and have not had an issue since. But in diagnosing this you need to be careful with the steppers being unplugged while being energized.

2 years later

I am having same issues. Filament wont feed. Stepper motor goes forward and back. Here what I have done. Swamped stepper motor cable - Cable was fine. Replaced complete extruder tip and tube - No difference. Changed Stepper motor - No Difference. Adjusted Stepper motor current - No difference Changed gear on feeder - No Difference. Changed guide wheel on extruder - No difference. Tried stepper with no filament in it or tension on the guide wheel - Motor still doing same thing. Reflash controller - No Difference. Replaced controller board - No difference. Reflashed new controller board - no difference .Checked power supply Voltages - All voltages rate where they should be. Scratched my head - no hair left. The only thing left is software. Same thing is happening in Cura and Mattercontrol. Have also reinstalled both. Help I am going crazy with this.