What if there was a machine where you could make anything you want, exactly how you want it? That's the thinking behind 3D printers, and race car designers are hoping to use the technology to create even faster cars. | For more World's Strangest, visit www.sciencechannel.com/tv-shows/worlds-strangest/#mkcpgn=ytsci1 Catch World's Strangest Tuesdays at 8/7c on Science Channel! Subscribe to Science Channel! | www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. | bit.ly/SCI2YT Download the TestTube app! | testu.be/1ndmmMq