Ah ok, dual extruders. I've never tried that kind of setup myself, although I had an idea about adding another E3Dv6 to the Tronxy and then using 4x splitters for both of those, totalling 8x materials. Would have to write some SW for that combo though, because none of the slicers understand that kind of frankenstein setup . Maybe someday...

One problem with dual extruders and especially with solubles is the handling of the hotend not in use. PVA and BVOH don't like to sit in a heated nozzle for a long time, apparently they start to go bad and maybe jam so that needs to be handled, I guess cooling down the unused hotend will do the trick.

Interested to hear how that Vanish works.