One of the coolest and most fun inventions is the 3D pen, developed by WobbleWorks. It works by extruding heated plastic that cools almost instantly into a solid, stable structure, allowing the creation of free-hand three-dimensional objects, similar to a glue gun in working. But unlike the glue gun, there are buttons on the pen for achieving fine control with projects.
The video below is a demonstration and a learning tool in the use of these pens. Hope this inspires you to create your own masterpiece 🙂