I had to take my Saeco Incanto down to clean the grinder. HUGE pain in the butt.
The grinder was so clogged with powdered coffee that it was kicking half-ground beans out of the grinding chamber and back into the hopper.
The coffee is supposed to go down the center, through the burrs, into carrier chambers that take it around and out to the ejection chute.
Looking through the ejection chute you can see the carrier chambers were packed with finely ground coffee beans. I dug it out with a small screwdriver because even blowing 120 psi compressed air at it didn't get it all out. After cleaning them I sprayed them with food grade silicone.
This is what happens when the beans you are using have too much oil in them. My old Incanto would choke down any kind of beans, but this one is a real prima donna.