The 3Doodler is a new kind of pen that doodles in three dimensions instead of two. Essentially it works like a 3-D printer, melting and cooling colored plastic to create rigid, freestanding structures in any shape imaginable (sort of like a hot-glue gun but better). Invented by Maxwell Bogue, Peter Dilworth and Daniel Cowen at the Boston-based toy company WobbleWorks, the 3Doodler raised over $2 million on Kickstarter (they were shooting for $30,000) and can be preordered online for $99.