Yes, I’ve 3d printed circles from freecad without issue. There are some precision options when converting to a mesh. I always set them to the tolerances of my 3d printer.

Overall, it still has a lot of rough edges though.

The treaty itself does not have any enforcement mechanism; however the US does. US courts recognize ratified treaties as having equal weight to laws passed the normal way Ratifying the Treaty would immediately make it federal law. The US has a robust enough legal system that the courts would the (over years of building up case law) determine exactly what that means.