Joerg Sprave from Germany runs The Slingshot Channel website and YouTube video channel. He's well-known enough that MyMiniFactory asked him if he'd like them to 3D print something for his slingshot activities. Well, he took them up on it, and they printed him a rocket that he used with the "world's longest pistol" to launch slingshot style. And guess what? It works. The rocket has a hole on the end, which he used to turn this weapon into something literally deadly because there's a place for a big sharp nail. You'll have to take a look at this intimidating weapon for yourself at http://3dprint.com/107150/worlds-largest-slingshot/.