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ABS material burnt into/on the nozzle - what to do?

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we got a brand new Ultimaker2 and the first prints came out fine. But now I have a serious problem with burnt material on the nozzle.

During the print something went wrong and the ABS material went all over the nozzle and got burnt. There is still a non-burnt bit of ABS filament at the tip of the nozzle (while the rest has a burnt coating) (see picture).

Can anybody help me with this problem? Is there a method to celan it? (Step by step for dummies?). And how can I prevent problems like that?

Thanks in advance,


IMG 20150122 111229s



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Unscrew the four screws that holds the fan bracket to the head so you get full access to the nozzle (you can just let the fanbracket+fans dangle while you work. Try to keep it out of the rear fan and away from the heat though). Heat the nozzle up to about 100C, pick away the bits you can get off. Heat up to printing temp and get any stubborn bits. Acetone is pretty decent at dissolving ABS so that can also help (just remember that it's highly flammable).

Some heat and patience should get rid of it.


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I recommend you just ignore it. But to clean it one method is to remove the nozzle and soak it in acetone for an hour and anything that doesn't wipe off after that I would burn off with a flame.

But taking the nozzle out of the head is tricky and you can break the temp probe cable if you aren't careful. Sometimes the probe slides out easy (after removing the very skinny screw) but other times it's just stuck the hell in there and almost impossible to remove without drilling it out and destroying it.


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