Did you see that episode of Spongebob Squarepants where a magic pencil is sent down to Bikini Bottom and Patrick and Spongebob can draw anything, it comes off the paper, and comes to life. 3D pens allow the images to come off paper, or you can draw in the air. Unfortunately, the images don't come to life. How does it work? The latest craze are 3D pens that use strips of plastic going through one end of the tube, heating up to moldable temperature and sent out the other end, the plastic quickly dries and allow you to write in the air. Check out what some people made.
3D Unicorn
Popping Bicycle
Plastic Flower
Yoda
Almost a Real Toy Solider
Even Jewelry
Dreamcatcher
Elegant Dragonfly
3D Design
Make anything, pop it from the paper, and you can hold your design.