While this is pretty much a hot glue gun squirting out plastic, for $75 you can get yourself a 3Doodler, what they claim to be the world’s first and only 3D printing pen. Legend has it that the first ever FDM (fused deposition modeling) 3D printer was invented by Scott Crumb when he ‘printed’ a frog for his daughter using a hot glue gun. Scott Crumb went on to form Stratysys and the basic technology upon which the entire RepRap ecosystem is based, including desktop printers such as the MakerBot, Ultimaker and the Cube.
Now 35 years later you too can simply draw objects in thin air with the 3Doodler too.
While it is a cute idea and a relatively simple concept that might be a fun toy to get people started with a very basic start at making things with plastic, they state the pen is not suitable for children under 12 years old (270c of hot metal squirting plastic at your fingertips), most likely their ideal market.
At the time of writing they have already raised over $145,000 from backers for their device with 33 days still to go so they have obviously found a market willing to give this novelty item a try.