Are you sure you're drying your PVA right? If you put it in a plastic bag while doing this, the moisture will stay inside...
See also the Ultimaker drying instructions:
- Put the filament spool in its original packaging (in a cardboard box, without the plastic bag), and place the box on the build plate.
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kmanstudios 1,120
The bubbles are humidity in the PVA. The cooking is not always visible, but the bubbles are a dead giveaway. And you may need to do a series of hot and cold pulls to clear out the nozzle. I am surprised you do not see charring on the outside of the nozzle, but probably is on the inside causing it to build up and clog the passage through the nozzle.
PVA is very, very hygroscopic. It can gain enough moisture in just a few hours of print even if dried out. Depends on your environment.
Once it starts to get squirrely, it goes very quickly.
If you do not have a dehumidifier to dry out the filament, putting it in the printer, with the bed temp about 50C for a few hours will help to dry it out.
The sky is blue because the atmosphere scatters the blue spectrum during the day when the distance through the atmosphere is at its thinnest. The other colours are passing through more efficiently. During the sunset, when the line of light traveling through the atmosphere is its thickest, the blue spectrum is scattered out before it reaches you and leaves only the reds and yellows to be seen.
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TMicke 23
That most certainly is when the PVA is extruding again after not having printed for a while for what ever reason.
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