Hi Steve,

> Is there a way with the library you use to get the shell
> tool to "fill in" the overlaps?

There is an option in the library to try and deal with a self-intersecting result, but I'm not sure how well it works. It's something I can experiment with in the future though.

One issue though is that trying to process such things can slow down the processing of the offset calculation by quite a lot, and it kind of goes about processing stuff in a different manner so I'm worried about just having that kind of processing turned on in all cases. I may need to do something like try to determine in advance in some kind of quicker way if it's going to self-intersect at the given distance before trying to handle it...

- Michael