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I don't have that grinder but have you set the burrs too closer to each other? When I clean my Gaggia MDF I have to push the burrs closer and closer to each other until they touch and then step it back one to get a zero point for the grind indicator.
jdp-
This was my thought too: I had set it flush so the rotor could not spin and then back it up a bit which then caused metal bits. I tried to backed up a bit more and it appears that there is no more metal grinding. Now the plan is to properly clean it and see if the setting is good enough for an espresso.
BartS
I just cleaned my grinder - Compak k3 touch and after reassembly it is grinding metal. I am struggling to find where the metal pieces are coming from but I wonder if anyone had similar experience or knows what could be causing that?