I am using ellipse and there seems to be strange behavior. I draw identicle ellipses and position them nice and neat, then draw two lines between them, trim to ultimately get one profile, to eventually extrude, but the result of my trim doesn't seem right, and it won't allow me to extrude, is there some sort of flaw or bug with ellipses when you trim them? Picture 6 ellipse lined up tangent to one another, then two lines parralel, equal distance from the tngent points, then trim to end up with continuous profile. Should allow me to extrude right? doesn't