If you wanted to do something really crazy, BTT has this awesome looking board with an expansion board that holds a total of 11 stepper drivers. This is also driven with the 168mhz cortex-M4 cpu. But i am telling you this could drive 3 Chameleons feeding into a Diamond Hotend. I am just saying 11 or 12 color mixing if we can find a few pins to dedicate to one more stepper driver. I would and very well might take on such a project after i understand how to use the MMU2S and the diamond hotend seperately. Here is that 11 axis board: https://www.biqu.equipment/collectio...31261892280418 . These are great and wild days for tech and we are only limited by our imagination and skills.