Kevin Rank has posted a great resource about 3D printable terrain and generally about terrain. This is great if you are new to this scene and want to get started quickly.
http://makerfun3d.com/printing-3d-terrain-boardgames-rpgs
Of course, he links to Mel, TheTerrainTutor. 🙂
Terrain4print 
Thanks for the kind words. Happy to see this resource being used by more people.
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