Two MIT researchers recently published a study detailing how they used cellulose acetate as a 3D printing material. Cellulose, the main component of plant cell walls, is everywhere, in the natural world and in the plant-based materials that we use every day, and many scientists want to replace the non-renewable plastics so commonly used in 3D printing with the much more environmentally friendly cellulose. It's a difficult material to print, though, but the MIT team found a process that works - and they even used it to 3D print a surgical tool with antimicrobial properties. Read more at 3DPrint.com: http://3dprint.com/166978/mit-cellulose-3d-printing/