In A new method was introduced to make it much easier to produce a solid printable object, from an admin border.

this video shows how to set things up.

DEM Earth geo-modifier, does the job of  magically re-projecting the flat mapping used on the texture, to the extrude objects UV coordinates, in realtime. All you have to do is connect your texture, to the geo-modifier.  

Once this is set up, you can make editable, and export for print,etc.