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Grindy patches on filament

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Recevied my UM2 a couple of days a go, totally new to all this 3D printing, had a problem with blocked nozzle to start with, managed to clear that, and seated the bowden tube firmly in to the print head so it does not move up and down, blue clip not really needed, printed the robot ok ish, and the ear ring file on the SD card, 210c, 60c bed, 50mm/s, any other settings I should note here?

Noticed some grindy looking patches on the filament as its moving along the bowden tube, I guess this is from the feeder at the back of the machine, and wondering why this is happening? my little white things on the feeder are at the top position


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