Although a CNC router is not exactly 3D printing, it uses the same basic technology so I figured I would make a post here. A Japanese company called TBWA\Hakuhodo, has used a CNC machine to mill ice into extremely detailed figures which can then be used as ice cubes. The cubes were milled in a freezer and the router was kept at a temperature of 19 degrees F, so that they coud keep the ice from melting.

The team used a software called Autodesk 123D to feed 3d models into the CNC router. Each one of these ice cubes took between one and six hours to create, so if you are considering actually buying these or using these they will likely cost you a pretty penny. Check out the video of the company milling a piece of ice into a small version of the Kinkaku-ji Buddhist Temple, followed by some awesome images of additional carvings: