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  1. Hello, there is a big Problem with my Ultimaker-2. Printing problems caused quite a lot of filament to be stuck inside of the print head. While the nozzle is free and does print ok, during printing the material inside the print head is heated up, causing it to flow out of the head and mess up the print. Advice on how to clean the print head are very much appreciated. All the best, Christoph
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