This is the Eiffel Tower Extreme Roller Coaster from NoLimits Roller Coaster Simulation. I did not make this, it is from the game in the version 1.8 tracks. I have not printed it because of it's sheer size and I also did not make the video above. This is one of only two coasters in this collection that is not real, as far as I know.

To find out how to export tracks from NoLimits to .stl, look at my post on http://forum.themeparkstudio.com/index.php?topic=108.0