Hi Alex, it seems to be something to do with the holes, maybe since they are so small. If you select the edges for the holes and then remove them using Delete, then it looks like you can shell the surface.
I'll investigate what is going wrong with the shell with the holes, it's probably something like a tolerance targeting the main surface size is not tight enough for those edge holes since they are quite small in comparison the the full object size.
- Michael
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