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My use case is a prominent smoothed out edge rounding with a large 75mm radius at the edges of a table. I can manage to meet my needs wit a sequence of manual operations, but that is not the point here! As far as remember there was maybe a way to create Class-A curvature continuous rounding in older versions of FormZ (I use it really for a long time starting with 3.x or so). I am not sure if this was integrated in stitch rounding (makes more sense for Nurbs) or simple and controlled rounding. The purpose for me is actually to smoothen out the join of the radius shape and planar surfaces to avoid the usual visible ugly "frontier" when the surface goes from planar to a constant bending. I the real world this is mostly smoothed out by professional modelmakers. In a complex CADCAM workflow it is not the best idea to do this manually both CAD and after milling. I searched the FormZ docs, forums (old too) and the web but did not find any hints related to FormZ, maybe looking for the wrong term. Class A Rounding Curvature continuous rounding G2 Rounding I found the facetting schemas in the FormZ docs and rounding tools, but this seems it only affect visualisation. When playing with the options and exporting the rounded shapes as DXF and check in other software, I get just a plain stupid radius. Maybe I need to stop to "play". Any hints? You find some content on "Curvature continuous rounding" in the context of SolidWorks, Catia and Alias, but the findings are rare.