The document discusses the hardware and mechanics of 3D printers. It describes the main types of 3D printer mechanisms as Cartesian, Delta, Polar, and Scara. The Cartesian type was selected for its simpler mechanism, less complex calculations, and ability to have a compact design yet large build volume. Within Cartesian, the main types are Core XY and moving bed designs. The document then outlines some of the key mechanical parts needed for a 3D printer such as the frame, rails, rods, and threads.