A Pen for Creating "3D Drawings"

From a couple of guys named Max and Pete comes this bizarre 3D pen called the 3Doodler.  Instead of ink, the pen dispenses a thin, steady bead of hot plastic.  You draw, creating a plastic line that cools instantly, sort of like making a wire sculpture with a glue gun.

Max and Pete went the Kickstarter route to raise funds to produce the pen.  They have raised ten times more than their $30,000 goal.  Yikes!  I'm not sure how much use I would get from such a pen, but it's a fun idea.  What do you think?
-Steve