I would love to see the option within simplify for users that have a diamond head installed on their printer. There are plugins for Cura that work with the diamond head but I think you guys can do better. Having it so that the head doesn't necessarily have to change to a different colour mix per layer but instead purge mid way through the layer or on the inside of the layer where it won't be seen in order to transition on the same layer. The colour mixing seems easy enough in the cura plugin where you specify the percentage of each colour required at certain levels from each extruder in order to create custom colours. I believe that full colour printing is on the rise and I would prefer not to have to use a proprietary machine in order to achieve great results.
Count me in on this request. Building a new printer using Azteeg X3Pro board which supports 8 steppers, x,y,z plus 5 extruders. Supports both Marlin and Repetier firmware. Not sure which firmware is winning this race, both are supporting color mixing configurations.