Hi Steve, there are a couple of problems with curve in these areas:



There are little fragments around 0.002 units in size at those areas.

Also the one on the right actually has 2 little fragments there, and that is the start/end of the curve. The little fragments are overlapping at that right-side spot, making this actually be an open curve that has a small zone of self-intersection/overlap instead of being a closed curve.

Here is a zoom in and some separation between the pieces on the right to illustrate some more:



If you have an earlier version of this, could you also post that so I could see if filleting introduced these little tiny segments?

- Michael