I am working on some ring designs and as far as I am concerned everything in this drawing is fine. When I render either in neon or Brazil I get what looks like a distinct line on the inside edge of the rendered piece. I checked my meshes and everything sis O.K… I have attached an image and also the drawing.
I’m not sure if Brazil uses the same render mesh as is created on the object, but the mesh on the object is rather coarse, especially on the inside and outside “flat” parts. If you use Custom mesh settings with a maximum edge length between 0.5 and 0.1 mm the number of facets increases. Hope that helps