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Feeder-stepper making pulsing noise when retracting material.

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My ultimaker2 recently started making a strange noise: The feeder pulses when retracting material. This happens when I'm changing material. It making strange noises after I updated the firmware with Cura.

I wonder why this happens and what I can do to fix it. (I haven't done the obvious: running the firmware-updater again)

I want to see if there's someone with similar experiances here.


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