When I am running the CAD export, I am getting one surface that is failing to export. What is going on?
First it is important to note that if there are apertures on some surfaces they may not be exported. As an example, spider obscurations are not currently supported by the CAD export.
If there are no apertures, sometimes the CAD export has trouble with complex shapes and the surface tolerance will have to be changed. To do this, go into the surface properties of the CAD part and go to the CAD tab. In the CAD tab change the Surface Tolerance to a smaller value like 1E-5 or 1E-6.
If this does not fix the problem please send the file to Zemax Support so we can debug it!