We're all accustomed to having appliances on our kitchen counters, from toasters and blenders to coffee makers and microwaves. If Mechanical Engineering Professor Hod Lipson has his way, we'll soon need to make room for one more—a 3-D food printer that could revolutionize the way we think about food and prepare it. Over the past year, Lipson and his students have been developing a 3-D food printer that can fabricate edible items through computer-guided software and the actual cooking of…