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Re:filament sensor triggers
Are you sure it's the PVA? I had a faulty sensor in mine and it behaved like that.
Also when it comes to soluble supports I have had excellent success using PLA and PETG. They chemically do not bond so you can print them like soluble without needing to post process it.
Yeah I've done a couple prints since that one with PLA and it was flawless.
That's an interesting idea about using petg, I've got some so maybe I'll give that a try. What settings did you use for them both?
If you're doing something bigger you'll want to set a raft - 85°C bed petg as the support, PLA as the main material.
Soluble support settings.
There's a whole article here - https://help.prusa3d.com/article/combining-materials-xl_498103
I'm traveling at the moment so I don't have my exact settings handy
PVA would come out in big bubbles instead of thin lines.
Dry the PVA before use and keep it dry.
PVA easily crystalizes and if this happens the $30 filament spool is trash. Also, make sure to drop the temperature by more than 5°C for the parked toolhead. Otherwise (you guessed it) it will crystalize and cause a clogged nozzle.
<Rough time estimate is 5-30 min at PLA temperature with no flow but this number depends on the exact PVA filament variant.
I was printing at 190, is that still too hot? It was fresh out of the vaccuseal when I attempted this, but for future attempts I'll be sure to dry it. I'm using SainSmart PVA
You should be fine. It is about temperature and time. Don't keep the nozzle heated up when it isn't used. Don't dry it frequently (keep it in a dry environment) and use low temperatures.
190° is the low end of printing temperatures. SainSmart should probably be okay when printed below 210°C
With "special" PVA like FormFutura Helios you go up to 250°C: https://formfutura.com/product/helios-support/
Regardless BVOH should be the better choice at higher cost.