What is the advantage? no fan noise or is there another benefit to water cooling?
If you have a heated enclosure or you're doing super high temps, a fan and a heatsink don't quite do the trick.
I bought some pellets to make Ultem (PEI) filament... It extrudes at about 360C! I'd definitely need something like this to try printing that.... That is, if my filament extruder can even melt the stuff.