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I just started with PETG and it seems to be going good but every now and then when im printing large prints they come out hairy and i keep getting this black gooey streaks
I am using Cura 3.6 my print speed is ridiculously slow 20MM/s nozzle temp is 255 bed temp 75

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Reduce nozzle temp some and see how it reacts. Also speed up just a little. 35mm/s maybe.

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