A 3D pen is a pen that extrudes heated or warm plastic from the pens nozzle. It is a handheld cousin of a 3D printer, and it allows you to create 3D art, figurines, game pieces, or basic plastic objects like baskets and phone holders. The 3Doodler is a popular brand of 3D pen that works by extruding heated plastic that cools almost instantly into a solid, stable structure, allowing for the free-hand creation of three-dimensional objects. Most 3D pens work by feeding plastic through the pen, which then melts it before it comes out of a nozzle at the end of the pen. The melted plastic is soft and malleable when it leaves the pen, but it solidifies within a few seconds, creating a solid, stable, pick-up-able structure. There are no files to transfer, and no difficult tech to master, making it easy to use. The 3Doodler has three models of the pen, Start, Create, and Pro, intended for children, general consumers, and professionals, respectively.