Looking to experiment with soluble materials? Perhaps you are constructing a complex design, and you need the assistance of a support material that can be easily removed from the completed object afterwards.
Whatever your motivation is, PVA filament is an incredibly fun (albeit extremely moisture-sensitive, obviously!) material to print 3D objects with.
As a soft and biodegradable polymer that dissolves in water, Polyvinyl Alcohol (PVA) makes it drastically easier to 3D print complex or delicate structures, often with partially enclosed cavities.
Once the object has cooled and hardened, you can simply expose it to warm running water and watch the PVA support material wash away; leaving you with just the complex 3D printed design.
It’s also ideal for producing quick, crude prototypes to iron out the kinks in the design, before reprinting the object with more durable materials later.