It could be that there are still some residues of filament in your print core after a failed print that block proper extrusion of your PVA. Please follow these instruction to clean your BB print core: https://ultimaker.com/en/resources/23132-clogged-print-core.
Let me know if you succeed. I recommend to continue with the default profiles and the BB print core.
If you would need to dry your PVA, follow these instructions:
Heating the filament for 2 hours at 45-55 °C. The easiest way to do this is by putting the spools on the heated build plate at the required temperature (45-55 °C). Warning: do not use a household oven. Make sure that the PVA filament has cooled to room
temperature before inserting it into the 3D printer.
Alternatively you can add multiple bags of the fresh desiccant in the sealed box/bag with the filament.
I don't know the answer exactly but you are on the right track.
#4 - don't worry about that. It's either obviously broken into too many pieces or it's fine.
It could be dust. Its more likely grinding happens first.
Does it make popping bubbly noises when it prints? If so that is the sound of boiling water. That could esily be the problem as it produces too much head pressure (maybe) which causes grinding (maybe) and then the pva bakes in the nozzle for 20 minutes when no one is paying attention and clogs.
Unfortunately it might not be possible to dry it. I'd read up about how other people dry their pva but I suggest you buy some new pva and keep it in a box with dessicant even while printing with a hole to let the filament out. Or at least store the pva in air tight bag when not in use even if just for a few hours.
nylon is pretty easy to dry. Not sure about pva.
Meanwhile until you get a new reel read about how other people dried their pva and also lower the right core by 5C.
Also consider getting a "hardcore" form 3dsolex because then you can just change nozzles and clean them by soaking them for a few days (disclaimer I sell 3dsolex products in usa).
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