Ender Dragon
This model is from the sketchup warehouse ( http://sketchup.google.com/3dwarehouse/details?mid=73d0ab888f9799e383c569ef28fcc2be&prevstart=0 ). It was edited and scaled by Grade 9 student Michael S.
He removed the dragon riders, edited the object so all surfaces intersect, and scaled the size so it's printable.