mmmm need for we big printers 
need only other 2 motor and 3 3way relay(agr) and malin mod…
https://www.kickstarter.com/projects/wr3d/the-diamond-hotend-single-nozzle-multi-color-3d-pr
Agrrr lose code of great relay…for this use… 1 pin switch 4 relays(in a single pack) 3 of this relay and can use e0 stepsick output + 3pin on ramps for activate correctly motor
Just backed it. Looking forward to June!
DS4E-M-DC5V find…3 pcs and right soldering and little hack on marlin 