The document discusses the 3Doodler, a 3D printing pen that allows the user to draw in the air or on surfaces using plastic filament. It provides details on how the 3Doodler works by melting plastic that cools and hardens as it is extruded. Instructions are given on loading plastic filament, selecting extrusion speed, and using the 3Doodler to create 3D objects. Both advantages and disadvantages of the 3Doodler are described.