Hi, new maker here. After several trails printing with PVA, I have the same problems as what you had. Especially, the small oozing out PVA, which causes tiny bundles or bird nest like support structures. I would think it could be PVA is kind of burnt in the nozzle, not sure, or as I printed it at fairly slow speed, 30mm/s, I should lower the temperature. I look at the printing process, I can always see a tiny drip on BB extruder while AA is printing. Sometimes, as so many stringings sticking on the support structure, nozzle bumps on it and knocks off the entire support.
Does anyone know what is happening here and any suggestions on what I can make change on settings?
Thanks in advance.