This really isn't a feature request, it's a bug report. Here is a visual of what Rosketch is talking about. Two components in SU, the right one has been flipped along the red. When exported as an .stl the resulting file is unprintable, as shown here in red. [image: 6iYs_Stlexportfail..gif]

@Box thanks for testing... do you think, Trimble knows and will solve the Problem? @cotty thanks for Link posting Rosketch