Two German students have unveiled what they are calling a conceptual prototype of a 3D printer that will fit into any kitchen setting and print out various types of meat. The concept would allow the user to chose on an iPad-like interface which meat they wish to print, adjust the mineral and even the fat content, and then hit the 'Print' button to begin fabrication. The students have decided to open source the concept to allow others to build upon their vision. all files are posted in Github, including that of the concept's operating system. More details on this Meat printer can be found here:

Below is a picture of the conceptual prototype that they call the Cultivator: