get a good 3 piece grinder.. the ones that catch your kief.
they have screens built in. i find the larger size kief grinder works
better than the smaller ones. probably b/c surface area of the
screen as the do get clogged over time. a clean grinder and
screen make it most effcient. Plus theres the compartment your
chron can stay in broken up or not (the middle where the screen is
after it falls from the top grinder part..