Dual printing notes?

[Tiger91 1]

I would like to branch out with the dual printing, and I would like to know a couple of things:

-Is there any good source for what prints well together? Could I Do PLA/PVA/ABS/CPE/Nylon/Ninjaflex in any mix and match order? Or are there some things that just don't go well together? I tried CPE/PLA recently, and I could get PLA to stick to the CPE but not the other way around.

-How do you design for dual prints on CAD? Do you just do a boolean operation? Or should there be some overlap? Anyone have good notes?

Thanks for any help!

[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.

[geert_2 557]

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.