Six-year old Katie Parke suffers from pulmonary alveolar proteinosis, which means she has to have regular surgeries to clean protein buildup out of her lungs. The procedure can be complicated in children, or at least it was until doctors at London's Great Ormond Street Hospital 3D printed an exact replica of her trachea. Read about the procedure at 3DPrint.com: http://3dprint.com/96655/young-girl-3d-printed-trachea/