By now you're able to 3D print just about anything as long as you have the plans for it. Microsoft and Warner Bros. UK have a treat: On December 13th, when the second Hobbit movie debuts, you'll be able to download plans to 3D print your own Key to Erebor from the movie.

The two teamed up to make a slew of interactive ads for Windows 8 apps that should be on Xbox too. If you don't own a 3D printer, you can always just buy an official replica from Weta. But who wouldn't like to make their own from a 3D printer? [Microsoft via The Verge]