Hi Michael, :-)

> That other one looks like it has some pretty messy areas

Yes I noticed that! but I want to learn how I can fix it! then MOI would be enough for me to create such complex geometries! (No need to mention I love complex Geometrical shapes :-)

>That sort of looks like pieces that were copied around a center point where the objects were not quite aligned with the center point.

Yes, U can do it yourself just try to make copies of the open object.

> Do you have a version of this before doing the filleting?

I already shared it with you :-) Do you remember "Single_Piece_Modified_with_123Ddesign.3dm" in theory you should be able to create the Linked-Star with that object.

But in reality I think you might face some issues and end up having a joined surface.