I have the K3, its worth doing the clean once a week as part of your coffee hobby. You also learn more about the grinder as you do that.

Remove the plug from the wall.
Mark the fine-coarse setting so that you have a reference point to come back to when you re-install. I use a touch of liquid paper.
I use a vacuum attachment to suck grinds out after removing the top burr, then a brush with a paint brush through the burrs and also through the throat, then vac again, repeat the brushing, then vac.
Before re-installing, plug back to socket and (keeping fingers clear) press button to check that the bottom burr is spinning freely uninterrupted. If it stops and starts, then theres an electrical problem.
Re-install.
As per instructions already mentioned above, start with a very coarse setting to determine the grinder is grinding freely, then turn it to the marker points (providing it is producing around 30ml in 30seconds for a single, or 60mls in 30 seconds for a double shot, approximate)
Yes of course when you change to different beans it requires slight adjustments to the grinder to get it spot on.
Gary at G


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