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Tirafilo Ultimaker 3

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Buongiorno a tutti, avrei un problema con il secondo estrusore, nel mio caso PVA. Dopo circa due ore di stampa (la stampa completa dura più di un giorno) il tubo bowden viene letteralmente espulso dal tirafilo, creando un ricciolo di filo in uscita del tirafilo. E' come se la velocità del tirafilo fosse eccessiva in relazione alla portata di estrusione. Spero di essere stato sufficientemente chiaro.  La testina di stampa è stata accuratamente pulita (a caldo e a freddo) ma il problema persiste.  Qualche suggerimento? Grazie 

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