When it became apparent a few weeks ago that the sawdust accumulation or grinding could be a problem, I used all the pellets in the hopper in order to check on sawdust accumulation on mine. At that point there was a fair amount of dust, but my WSF was still running completely fine. I cleaned out the accumulation with a shop vac and went on about my day.
Two days ago I was getting near the bottom of the hopper again so I decided to run it out and check on sawdust again. This time there was very little accumulation.
I've just put it in the back of my mind that once a month or so I'll run the pellets out and check for too much dust, just a maintenance item for me