Hi Michael,

Bingo! You were correct. Points were not welded :'( I modeled it using Zmodeler and polygons that belong to different polygroups get disconnected during obj export. When all polygons get a single polygroup the export is unified and the conversion works flawlessly. With a quick inspection moving a specular highlight over the surface, it looks even better than the result of the first method.

And that link is super useful, I needed that "exact" option since I go back and forth multiple applications. You are a national treasure! <3