Thanks for the referral !
VS3D version 1.55 included more options on the G-Code output to make it compatible with more types of machines/controllers.
The main change for version 1.60 is the ability to export a fully-enclosed STL (triangle mesh) of a selected region, rather than the entire surface.
Here is the updated documentation for the related functions:
VS3D user's guide - section 1.1.3B
VS3D user's guide - section 1.1.7A
1.60 also has numerous other subtle enhancements.