Cura settings to make the second extruder print the dissolvable support

[FlyGhost 0]

I’m using AstroPrint which is backed by Cura 15.04 to slice. I wanted to use my 2nd extruder to be printing the support only, where I’d supply the dissolving support. 
 

I cannot seem to find the right settings is this even available?

[Smithy 1,128]

I think it is much better to use a newer version of Cura, slice it there and use Astroprint just for sending the job to your printer. Cura 15.04 is more than 5 years old.

[FlyGhost 0]

Hmm I’ll check out newer versions again, but historically I was using Cura and I simply could not obtain a good print like I used to with the newer versions. I have had decent results with AstroPrint. So I suspect it’s their printer profile over mine?

[Smithy 1,128]

You can hardly compare the version 15.04 and newer versions, too much has changed internaly.

I have used the old Cura version only for some tests with basic prints. In newer versions it is not a problem, but I am not sure if you can configure it in that way with 15.04.