Thanks

Do the duet board allow this kind of architecture (in the frimware I mean, without too much tweaking)?

I saw this thread http://forums.reprap.org/read.php?397,714601 about static motors for IDEX in a coreXY setup but I don't know if it's possible with a duet board.

I don't like to have a moving axis motor so IDEX with a carthesian moving system so it's not the best idea in my opinion.

Thanks a lot, I now have my printer general architecture.

@T3P3Tony:

You can use an two more external drivers on the CONN_LCD header with recent firmware

That would allow you to drive your 6th extruder.

Is this compatible with the panel due? What's the standard use of this header?

I will use both heads at the same times, one for the main structure in PLA, and one for the support material in PVA.

Is there any major differences betweens multiple motors on the same driver and map different motors? I need 6 extruders so I can't have two ∆a and ∆b motors.

OK so that's why you have two things moving. There's just a thing I don't understand, have you two Y motors on each corexy (see the image)? Lastly, how many Z motors do you have?

OK, that's good to know. Maybe it will ne usefull for the Z axis.
I saw you use direct extruders with your diamond, is it possible to use bowden to reduge the weight or it's a bad idea?