Hello Martin, thanks, glad to see you here too, seems that we are same kind of people on the same quest: Hunting of good 3d software :)

Regarding this topic, I don get the way to do this patch on Moi, so, back to via cad/shark, I do a few more tests and seems that the key is to use the rebuild surface tool on the patch blend surface, this way, moi imports Sat, Step and IGS format without problem



Michael:
Notice that my first attempt I use the 3dm model downloaded from this forum that doesn't have the patch, and I patch the hole using the cover surface tool, so, maybe an internal rebuild occur on the process and that is the difference with previous ones,

Martin: In this ones I make a model using the blend tool with setback at 80 (working with mm), then rebuild the surface in question, here both files, the sat resulted from exporting and Moi file with the imported file: