I have a surface that I'd like to save into a .stl filetype for use with another application. SW2008 sp3.0 doesn't like this and says that the operation cannot be performed. "The file could not be saved because the part's geometry is not valid for this type of save operation." Any way around this? I also have Rhino surface modeling software that can import my SW surface and export it as a .stl but this is very cumbersome to export, then import then export for every face/surface that I'm interested in. This is rediculous that SW can't do this. Any help would be appreciated.