Just as a comparison , i took a half hour to strip and clean thoroughly my K3 collecting and weighing every grind i could find.
Result..and this id from a grinder that has not been cleaned for near 2 months of daily use... was total 4.2 gms.
Most of that was "loose grinds in the discharge port and hanging about in the sweepers, and one bean jammed in the center of the lower burr.
There was probably less than 1 gram stuck to the "non working areas of the grind chamber.
This gives me no concern as i have the common habit of purging the grinder with 4+ gms each morning before the first brew, and as those "stuck" grinds dont come into contact with the grinds in process, i am pretty confident that my shots are fresh grinds from the start.
With a good sensible operating procedure , retention is a non issue.
Result..and this id from a grinder that has not been cleaned for near 2 months of daily use... was total 4.2 gms.
Most of that was "loose grinds in the discharge port and hanging about in the sweepers, and one bean jammed in the center of the lower burr.
There was probably less than 1 gram stuck to the "non working areas of the grind chamber.
This gives me no concern as i have the common habit of purging the grinder with 4+ gms each morning before the first brew, and as those "stuck" grinds dont come into contact with the grinds in process, i am pretty confident that my shots are fresh grinds from the start.
With a good sensible operating procedure , retention is a non issue.

. A friend has an M4D and it's a lovely grinder. Didn't seem that messy and can be set quite accurately I thought??

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