Polymaker PolyDissolve S1 PVA Filament 1.75mm - 750g Water Soluble 3D Printer Support Material for PLA | Perfect for Complex Prints, Multi-material Projects & Dissolvable Support Structures

TLDR: I recommend getting 2 spools so you can switch them out every 12 hours or so. One printing and one in the drier. As far as dissolving the filament, I just put it in a tub of water for several hours, there were some areas that were still sticking after, I just scrubbed them a bit with a dish brush or tooth brush and they cleaned up well.There is not a lot for me to say that hasn't been said in these reviews already. I just wanted to add that if you're running this in a Bambu AMS system, you will need a filament drier. This filament was superb the first few prints, but then once it absorbed enough moisture to be out of spec, it was terrible. It would keep breaking while being retracted and get jammed in the hot end. Had to completely dismantle the hot end 4 or 5 times. After drying it out, it worked well again.I have read discussions online about people not needing a filament drier because the general atmosphere is dry in a particular region where the person lives. I live in the desert in the Southwest United States where humidity is 20% or less (often 10% or less), and I run a filament drier for all my filaments. You will especially need it for this one. It is designed to absorb water so it will dissolve. It will suck up whatever moisture it comes in contact with.