I have looked into this a little..
As far as I have found.. you need to be sure it in a usable format
Quote:
A standard data interface between CAD software and the machines is the STL file format. An STL file approximates the shape of a part or assembly using triangular facets. Smaller facets produce a higher quality surface. PLY is a scanner generated input file format, and VRML (or WRL) files are often used as input for 3D printing technologies that are able to print in full color.
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Also non planer surfaces cannot be read properly as far as I know.. polygons and triangles also to make it cheaper,, you make it hollow by adding an internal wall.
Colonial Communicator would be a simple enough model to work with.