The document discusses 3D scanning and printing. It describes the process of 3D printing an object in two stages - first designing the object using a program, then simulating it before printing. As a demonstration project, the author 3D printed a headphone hook. The rendering and printed object are shown. The document also mentions 3D scanning and notes the 3D printing simulation program Repetier is easy to use but has some margin of error in estimated print time.