as the break was clean
Where do you see the break? Inside the bowden?
Some people rewound their filament onto a tighter reel, or simply dried the filament too much by putting it in a box with desiccant for a week. And then later the filament shattered into hundreds of short pieces. Could it be your filament was too dry? Or too old?
I'm guessing you have "bad" filament and should order some more.
I've never had this problem but I would remove the bowden from the test head and push it out through the feeder. Be careful. On the print head there is a little clip - remove that clip. That clip holds up the "bowden holder". The bowden holder has 4 metal blades that dig into the bowden. Loosen the 4 thumb screws on the head so that the head is loose - maybe 2mm or enough so that the bowden is loose. Then push down on the bowden holder and pull up on the bowden. Be careful as the metal blades can scrape the bowden and it might not hold well next time. If you do damage the tube just cut off the bottom 1mm of the bowden and put it back in. Tighten the 4 screws last so the bowden is good and tight.
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