Chose the level of detail and area you want to model
Determine the size and scale of the model (how will the model be displayed)
Export a VRML/PLY file for 3D printing from GIS software – DEM (digital elevation model) – Color Image (Orthorectified, registered to the DEM. Satellite, Aerial, Annotation, Chloropleth)
Print 3D model of VRML file on 3D printer with easy-to-use Z Corp software