After importing this model and doing "feature recognition", when I roll the model back before the fillets at the end, there is a strange artifact left over that i'm unable to fill. I've tried "fill surfaces" and a number of other strategies with no luck. Anybody seen anything like this?
I've included the models before and after feature recognition to be safe.
Yeah, this kind of thing is pretty common, although it usually shows up when you use Check as some sort of invalid face or edge. You probably already know that FeatureWorks isn't going to do anything for you on this part. It's simple enough you should be able to rebuild it manually if that's what you need.