Creating Voids in Solid Models

I would like to create voids within a solid model to reduce the cost of 3D printing - is there a plug-ion that will do this?

Read this thread in SketchUcation forum. It might be of use to you.
http://sketchucation.com/forums/viewtopic.php?f=323&t=44301&start=60

Thanks very much for the reference - I’ll take a look
Doug