This is the Gaia Roller Coaster from NoLimits Roller Coaster Simulation. I did not make this, it is from https://nolimits-exchange.com/coaster/gaia/477. It is the top rated roller coaster on NoLimits Exchange. I have not printed it. 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