With a 3-D printer, all you need to create whatever you can imagine is plastic or metal alloy wire and a bit of time. Using a technique called “additive manufacturing,” a 3-D printer builds up layers of material into whatever knob, part, utensil, fashion accessory, or miniature you fancy. The future possibilities for 3-D printers are endless: you could use one to build food on long-term space missions, reconstruct crime scene evidence, or even create replacement human organs.While your home 3-D printer can’t make you a new kidney, here are 10 science-inspired 3-D objects that you can make right now in your workshop.