Theta Printer | Hackaday.io
https://hackaday.io/project/81225.09.2014 · The Theta Printer is a platform for printing with as many different materials as possible. Whether it be different colors of plastic, wood, carbon fiber, chocolate, or anything else you can make an extruder for. Each extruder moves simultaneously and independently, allowing the printer to lay down 4 different materials onto the same object at the same time.