Is there a trick to set up cura that only the top and bottom layer of the support interface is printed with a different extruder?
For example I want to print PLA and BVOH with 3 layers support interface like this:
BVOH interface 3 (100%)
PLA interface 2 (100%)
PLA interface 1 (100%)
multiple PLA infills (20%)
PLA interface 3 (100%)
PLA interface 2 (100%)
BVOH interface 1 (100%)
With the current settings I can only achieve:
BVOH interface 3 (100%)
BVOH interface 2 (100%)
BVOH interface 1 (100%)
multiple PLA infills (20%)
BVOH interface 3 (100%)
BVOH interface 2 (100%)
BVOH interface 1 (100%)
The problem with that is that the layer adhesion between PLA and a soluble support material like PVA or BVOH is not as good as the layer adhesion of PLA+PLA or the soluble material with itself. So trying to lay down 100% support material on 20% PLA will more likely fail than on a solid PLA base.
This settings would make mixed material support much more applicable and there are many advantages to do so:
save money for specialized support materials like Breakaway or BVOH
less material that needs to be dissolved
depending on the model the number of extruder switches can be reduced by >90% --> better print time, less chance of clogging, less oozed out material