Thanks! I'm currently in my third year, so I've taught a few labs and recitations. On the first day, after introductions, I always say something like 'As you've probably noticed by now, I have a stutter. I realize it can be distracting and difficult to understand at times, so if you ever need me to repeat myself, please ask'. I've never had any issues with it aside from a few ignorant comments on the end of term teacher evaluations.