3D printers are increasingly becoming more powerful and capable of printing complex objects from all kinds of materials. Many car companies are already using 3D printing to create prototypes and to more efficiently create specific parts of a vehicle. 

Most recently, Audi showed off a miniature vehicle it created using its metal printers. And the automotive startup Local Motors is aiming to begin production on a full-size car using 3D printing in the next few years. The company has already created several prototypes, and plans to sell a production model (shown above).