The document discusses the design and implementation of a 3D printer using an X, Y, Z axis CNC machine. It describes how 3D printing works by laying down successive layers of material under computer control to create objects of almost any shape from a 3D model. It then goes on to provide details on the various components of a 3D printer like the heating element, microcontroller, and software used. Applications of 3D printing in various fields are also mentioned. The document concludes by discussing potential future applications and advances in 3D printing technology.