Printing with a Maker Bot.

Hi!
I've created a wire frame model in SU of an object (cube) that has an internal void (hollow) inside of it. If I convert this to an .stl file and try to print it, is it possible to only infill the area between the internal void and the surface of the cube? Or will the whole thing get infilled? Or, because there are internal surfaces, will it not work as a solid at all?

Anybody know how to do this?

Thanks!