Tesla Coaster

I tried to print http://www.thingiverse.com/thing:1470838 but it wouldn't slice well with Slic3r so I decided to just make my own version.

I've since made a few alternative versions and the design is available on Tinkercad here https://www.tinkercad.com/things/lHJIWgqjpyL-tesla-coaster/