The mesh wouldn't need to be that fine if it just had to exclude whole coffee beans.
I think I'd use a bottomless bean bin that pulls out with a handle. While it's pulled out, it's over a grid that lets water pass through (and ideally makes it clear that any water added is just going to be dumped right on the counter). When it's pushed back in, the beans fall into the actual bean reservoir.
I think I'd use a bottomless bean bin that pulls out with a handle. While it's pulled out, it's over a grid that lets water pass through (and ideally makes it clear that any water added is just going to be dumped right on the counter). When it's pushed back in, the beans fall into the actual bean reservoir.