Chattanooga Tennessee constructed with SRTM2STL using SRTM data from the Space Shuttle. Lookout mMountain and the Tennessee River show up very well. Amplification factor on elevation was 2.0. The source code for creating these files is available up on github under the GNU license. Go to github and search for SRTM2STL.
You may want to print this to be relatively small. I get warping using PLA and it gets bad when I try to print Raised Relief Maps that are big. I have had 'some' success with big maps. If you have a way to control warping you may also have better luck with big maps.