So for example with Extrude you get this kind of result:





That seems to be the kind of edge arrangement that you might want.

But just be aware that extrusion of a curved object in one set direction does not actually create something that has a constant thickness throughout the piece.

Here's an example where you can see this more clearly - here I have a curve and then a second copy of it a small distance vertically above it. This is like extrusion, and you can see that the thickness is not equal in all areas:



When there is less curvature it becomes more difficult to see it clearly though.


It's only shelling or offsetting that creates things with constant thickness everywhere, unless the thing being extruded is planar in which case extrude is equivalent to shell.

- Michael