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Clean clogged printhead on Ulitmaker 3

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Hello,

I started a print on our Ultimaker 3 and after 20 minutes a "blob" of PLA had built up around the nozzle. As the printer apparently had printed continously on one place, the PLA entered the printhead and everything is clogged.

On a side note, I started the print on our second printer and it printed fine, so it wasn't the file.

I can't remove it mechanically while applying moderate force. Do you have any tips for cleaning up the printhead in this case?

External view:

IMG_20171106_090510_BURST002.thumb.jpg.f5bbfa9a8943b2c0af365b5ec5056240.jpg

Internal view:

IMG_20171106_090523.thumb.jpg.791d32be4de618c1363716b4c708c1ba.jpg

Is there a tutorial how to disassemble the printhead?

IMG_20171106_090510_BURST002.thumb.jpg.f5bbfa9a8943b2c0af365b5ec5056240.jpg

IMG_20171106_090523.thumb.jpg.791d32be4de618c1363716b4c708c1ba.jpg

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