I don't have a dual extrusion machine, so I can't comment on material (in-)compatibilities.
But you could always design mechanically interlocking features into the models, to improve strength of the bonding interface. Then even if it doesn't bond, it can't fall apart. And if the design permits it, provide a few tiny holes at the bottom where you could drip in cyano-acrylate glue along the interface line. It's not optimal of course, but it might be sufficient for showing prototypes.
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kmanstudios 1,120
PLA/PVA works as advertised
Nylon/PVA Works as advertised
NinjaFlex-SemiFlex-Got it to work:
https://ultimaker.com/en/community/34651-flexible-filament-on-um3
Sometimes it depends on whether I need a 'real' support or just something to cradle the print's underside.
I have been experimenting a bit with PC/PVA using the 'cradle' analogy, but it failed miserably when I needed it to do a real support. It also bonded very slightly so that when using an ooze shield, it just was weird.
ABS/PLA, again, depends on whether you are needing a support to stick or just cradle. I am not a fan of ABS anyway. But, since I am getting better at PC printing, I may return to ABS and try again. I got three spools of the stuff and I just hate waste......
I also use PVA slurry made from recycled PVA supports as my main bed adhesion.
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