I just saw this the other day, pretty neat. 4 filaments feed into the print head and can be applied per the model’s color boundaries (of some sort; don’t know their method).
Not sure how many kinds of filament can be used (I’m guessing it’s limited for now), but it would be pretty neat to print in, say, “wood” and “iron” and “brass” (or reasonably close). Or, print a logo into the surrounding background, which would result in a pretty tough sign.
Their specs are meager at this time. But it’s neat to see a new approach, which will in a couple year’s time probably be well matured, and able to take multiple material types.