Searching for a Rhino person here


I KNOW this is a Blender section but since there isnt a Rhino section at CGS then Im going to see if someone can help me then I will go away…Im a member here and not going to join a Rhino group just for one question

Im a newbie at Rhino(Mac) and Im trying just to get an imported mesh to be exported as a step file and I cant get the surface blend converting thing to work. It still wont export anything because its not actually converting to solids.
Please help anyone that knows