I'm with AM. Surely that can't be ground coffee in the doser chamber......it's a mazzer and it's clean, so there you have it.....technically impossible. Barely a spec of ground coffee anywhere on the outside. I know it's a sad tale, but 85% of cafes still do the same trick - letting the doser chamber fill up so it's ready to go first thing in the morning. Most popular excuse I hear is "I hate the noise it makes".