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Black blobs appear at random.


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Posted · Black blobs appear at random.

Wood filament will leave these behind if you did not clean the nozzle thoroughly, try an atomic pull a couple of times untill no black pieces are left behind

Greetz Barry

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    Posted · Black blobs appear at random.

    I have found any filament that is hygroscopic will do that as it cooks the moisture out of the filament and will make a dark char over the nozzle. PVA is especially bad about this.

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    Posted (edited) · Black blobs appear at random.

    Have a look at the nozzle while printing. It could also be that molten material accumulated on the outside of the nozzle, especially on small objects, or when you have a bit of overextrusion. And then that starts to burn, sinks, and gets deposited at random spots on the print.

    In my experience, thick light-brown blobs usually come from the outside of the nozzle, while thin black flakes usually come from the inside, with PLA and PET. But this may be different for other materials of course.

    Anyway, regularly doing an atomic pull never hurts. And you should definitely do one whenever changing filament.

    Edited by Guest
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