For removing edges inside surfaces
grabcad
Basic idea is using the projection of composite curve to generate a spine to form the surface, not a combination of line segments, please check the difference between 2 models. This is not the fake trick by displaying edges.Curve-Composite curve.Surface-FillCreate sketch on the surface , convert entities by selecting the surface,Revolve the sketch.Before I found this method, I got stuck for a long time.Hope this help anyone who need it. Or using spline tools in sketch, spline tools -Fit spline with delete geometry option
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