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filament feeder

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Little teeth marks is completely normal. Maybe post a picture so we can take a look?

But regardless, the pressure is adjusted with a hex screwdriver in the little hole next to the bowden tube entrance.

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The default is the middle position. Optimal pressure depends on filament and print settings. Trial and error is the path to "optimal" pressure. That said, I very, very rarely touch that setting. Basically the only time is if I'm trying to print some "weird" material like NinjaFlex.

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