I have a Niche Zero. Periodically I remove the burrs for cleaning. After reassembling it I check the calibration.
Yesterday after doing all of that I forgot to bring the notch back to grind setting I normally use. I loaded the beans, reached for the switch, and ...... stopped there. Fortunately I remembered to rotate the ring before running the grinder.
What would have happened if I had turned it on? Damage? No damage? Little damage?
I am sure that it will happen, soon or later.
The only topic about the subject is this one, it's comforting but it refers to flat burrs, not conical: Damage espresso grinder burrs by adjusting them too close?