"When the MakerBot Replicator was introduced at CES earlier this year, its main selling point was the ability to print in two colors. While impressive, remember "two color" is just another way of saying, black and white.
Richard Horne, an electrical engineer and 3-D printing enthusiast, wasn’t happy with that limitation. He wanted to print in color, hundreds of them, even. So, he got to work modifying his RepRap to dynamically generate new hues. Finding a no more fitting name than his own, he dubbed his printer hack the “Rich Rap.”