Hi, I still have some problems with a simple extrusion. I must be missing something, please shed some light on this. I don’t quite understand how to get rid of edges inside the extruded body. I don’t know why they are there and don’t quite get why I need them. They don’t really bother me I think but I’d prefer not to have them I think 
The much bigger issue, although I’d really appreciate a comment on both of these, is I’m always getting artefacts. I don’t know what they are, where they come from or how to get rid of these.
Attached is an image of the edges I mean, the artefacts I mean(these are hard to see sometimes) and a tox that generated these and is supposed to show what I’m doing.
Thank you a lot!
extrudeExample.tox (982 Bytes)
Hi.
Have you tried simply transforming the group selection vertically instead?
Looks like Extrusion isn’t working with sets of shared edges as nicely as you’d expect.
Perhaps creating a closed polygon from your selection, transforming a copy up, and skinning might work.
Just some random thoughts,
Rob.