I am working primarily in Sketchup and Rhino on a Mac and am looking for the best workflow to post files to Shapeways. I have come across plugins like CADspan for Sketchup, but feel that there may be something better just in the export settings or file type (.dae, 3ds. stl) from Sketchup and Rhino which would help to reduce the cleanup in other programs like netfabb. Any guidance would be much appreciated. Thanks.