Hi cx,

> This simple model can do, but complex models? Often difficult
> to change the design workflow。

The bug in this case seems to be when you have one long edge that then has only one relatively small piece taken out of it.

If you had a more complex model it would actually have avoided running into this particular bug.

See my previous example where a model with numerous notches taken out works fine without doing any other workaround:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4830.6

You happened to run into a bug that was specific to the particular configuration of that one model... That's going to happen from time to time.

I've added this one to my list to investigate to see if I can fix it up - it helps a lot having a simple and well constructed example like you originally posted.

For the most part this kind of simple case filleting tends to work well in MoI, I was pretty surprised that this one didn't.

Filleting is a quite complex process, it only takes one small bug in any one of a sequence of different operations to mess it up.

- Michael