Thanks for checking the file Michael.

What happened was that I deleted the double patches, saved the file, but after reloading they re-appeared. As if they are created during the saving or loading of the file. I noticed a previous backup save is in worse shape then the one I sent you initially: https://www.dropbox.com/s/sliyjvr92a6mhs7/starmania_work_v17.3dm

I tried replicating what happened with file I've put in the link above just now, but I must have done something weird yesterday or it was the weather. Because when I now clean double patches they seem to re-appear no longer.

Maybe they got there because of a sloppy workflow? What I basically did was boolean the cup and star shape out of a big flattened sphere and extrude and fillet the resulting shapes. But maybe I should have used trims and projected network patches instead of booleans and a huge sphere. It creates better polygon exports as well I noticed.

Thanks again,

-Ronald