Converting a Model to a Mass

[pgutentag697749]

Hello,
I am trying to convert a building that I have designed in revit to a massing model so I can 3d print it. How do I go about making what I have to a massing model? Do I have to completely redraw the model?
Thanks

[dhurtubise]

Why do you want to convert to mass? You can find an STL exporter here http://sourceforge.net/projects/stlexporter/