Pittsburgh Terrain Coaster for Brew Gentlemen

This is my winning design for the [Beer Coaster Design Challenge w/ Brew Gentlemen](http://www.3dppgh.net/beer-coaster-design-challenge-w-brew-gentlemen/). I used [Terrain2STL](http://jthatch.com/Terrain2STL/) to generate the terrain of Pittsburgh including the 3 rivers and Braddock. I have to use [this tool to repair](https://tools3d.azurewebsites.net/) the exported terrain before I could import it into OpenSCAD. I used the OpenSCAD script `my Square Coaster Blank.scad` to generate the required