Michael.

In the attached file, the cone placed at the origin was generated by extruding a circle to a point and with no end cap selected.

Using the Shell tool to thicken it up a bit, gives a rough result and I wonder if this can be tweaked.

The other cone was made from a revolved line and the surface thickened in the same way as before, but this time, has turned out as expected.





Thanks.
Martin (2).