There is actually a standalone script on this thread here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7046.1
But as I wrote above it's not a good idea to import a typical densly triangulated STL file into MoI making a separate trimmed surface for every triangle. NURBS solids are not designed to work with dense faceted data like that and it will be a very heavy and difficult to work with file as a NURBS solid.
- Michael
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