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PVA BB04 printcore; Does not extrude throughout print

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I have a new UM3 and I used PVA in the #2 BB Printcore with the default settings. I did a print that was supposed to last 3 1/2 hours. The BB printcore extruded about 2-3 mm of height, PVA and then stopped extruding the material. I tried the print again, this time increased the default temperature up 10 degrees Celsius. This time it extruded about a height of 2 mm and stopped extruding. Again, both printcores are new.  Both filaments used are Ultimaker NFC. It's the Natural PVA. I did the print with the PLA only, using PLA as the support....no issues.

Any ideas?

Edited by Guest

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Just to be thorough, have you tried to do a set of hot pulls and atomic pulls? I am thinking something may have gotten stuck or burned inside.

When I first got my UM3E, it did not want to extrude until I did a cleaning. And, the BB core requires a bit more love and care than the AA core because of the nature of the PVA.

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I'm within those numbers for temperature and humidity. But, I used this as soon as I unwrapped it and that's how I got these results. So, the PVA was not laying around. After, the bed leveling and setup, I unwrapped it at that point. So, there was no time for it to develop any issue like that with such short time frame.

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this might be your problem.

I had this problem and it was the hot pull that worked for me.


when you check the filament length all the way to the feeder, do you see a massive gouge where the gear has eaten into the filament?

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