My Mini is a couple weeks old. Maybe 30% or so of the time it retracts, it makes the noise you’ll here around 10 seconds in, in this video:
It’s almost like a knocking noise or maybe a very brief grinding? Is this anything to be concerned about? Does it indicate anything like retracting too fast or too far? Seems to do it more frequently as time goes on. Prints fine, though. This is using Simplify3D by the way.
Edit: can’t get embedding to work. Sorry!