It actually went surprisingly well. The first was alright, 2nd went much better. But the interviewer had more of a calm style. They both understood after I told them about my stutter, like usual. Preparation helped out quite a bit, studied a bit up on engineering documents and being able to answer a few without stuttering at all made a pretty good impression. Even ones I didn't know that they were going to omit, I asked them to ask anyways.