Built in the Minecraft world Vokselia by Mauricio Vives, then exported using the free Mineways program. See his site for more information, and see the video of its unveiling here.
Mineways can now print with full textures applied to the model, but this is a nice print because of its simple solid colors. If you want textured versions, see the following here and here.
Despite having been printed numerous times, Shapeways now claims this model "is not printable in any of our materials." I am uploading all of my models to one of Shapeways' many more-reliable competitors as this sort of issue is just ridiculous.
Here is another place to print a copy: http://www.sculpteo.com/en/design/hyperion-bc/xL6BUnPG
From http://www.planetminecraft.com/project/castle-lividus/, I exported using Mineways just to see if this would print OK. I'm not making any money on this model, the cost is all Shapeways'. This section is printed at 1 mm/block.