@oliof Four layers of belts is fine as this will also use four motors the cost is in consideration as commercial design for 600mm sq and up, This is not being designed cost for the home hobbyist, The team also is asking for filament change and purge on the fly with each head. So this is a large machine and the concern of stacking belts is not a problem, I am not software / firmware savvy so need help on the software / firmware side, So can this be done in the current firmware with a proper config.

Chris T Grosbeck
Sorry if I sound rude about home hobbyist but that market is out of China and we are not looking to compete at that level!
we are targeting $10000 base printer to 30000 with IDEX and dual on the fly material changing 4 or 8 per head!

Is it possible to currently set up IDEX as both heads driven CORE XY?

So 4 motors driving the CORE XY at all times but one head would stay outside the print area until commanded.
This seems doable just, I just don't know if the kinematics in the firm ware can handle the logic of the head that is not in use and still work in conjunction to move the gantry.

My background 30 years designer spatialized equipment.
Mechanical Engineer Designer

Chris T Grosbeck
MiMe.Global