In 1984, Charles Hull patented a process he called “stereolithography.” Now called three-dimensional (3D) printing, this technology has been used to manufacture rocket engines, custom-fit athletic shoes, and other 3D printers. The medical field also has reaped the benefits of 3D printing. Imaging data from computed tomography (CT) scans, ultrasounds, or magnetic resonance imaging (MRI) can produce 3D images on a computer, and precise 3D-printed anatomical models can be used for teaching or to help in surgical planning.