Two college students invented an adapter that allows 3D printers to print in full color for less than $100
So its Rich’s color mix head?
Dye mixed in nozzle/head so no. Richrap is 3 cold ends to 1 hot end
Ah.
Patent Pending. 
@David_McGuigan That’s a new approach to colour printing and you can bet the commercial printer designs will take to it like ants to sugar. Patenting it is obvious because it’s going to make them a lot of money.