Bambu PVA
Picture from https://twitter.com/BambulabGlobal/status/1768655098811404669

On Friday, Bambu Lab announced the new Bambu PVA filament, a water-soluble filament to provide support for printed parts in complex structures. It is said to ensure smooth and uniform support contact surfaces for perfect model appearance.

Bambu Lab says the new Bambu PVA support material can be effortlessly dissolved, eliminating the hassle of manual cleaning.

The filament is quite expensive, though, at $39.99 for half a kilogram.

If you are interested, you can find it in the Bambu Lab store: https://us.store.bambulab.com/products/pva