I've never had this problem but I've only gone through about 3 spools of PVA over the years.
I've been told that dry PVA gets brittle and can break. It might be that your spool is over a year old but I have 1 year old pva that is still fine.
Anyway I would first assume that only the outer meter or two is brittle. So I would try breaking it manually and then unspool a bit and repeat the experiment for a meter or two (and throw all that away) and see if it gets better. If not loosing the spool a bit so air can get down into the top 2 or so layers of the spool and leave it out at 50% humidity for 24 hours to see if it can self repair.
Normally the problem is the opposite - it gets too much humidity. Then when printing, the water is boiling and causing the PVA to foam and act badly (doesn't stick to itself and it's too big and the head can bump into it).
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wibraun 0
I have a similar problem.
I use a brandnew ultimaker S3 an the delivered PVA Material.
Somtimes it is printing fine. But a print in few minutes later the unchanged material PVA brakes mainly in the tube.
I think this type of Ultimaker material is not the best. How ever it is not weth it is try.
But it contans some points of weak material where it brakes. It is a mess.
on the other hand it prints sometimes for houres.
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