I ground my first batch with the 3 roller crankandstein and it worked very well. I think it could be a bit too fine (very floury) but there's room for adjustments. I copied a hopper design off the web (just google it) and it worked ok too although it doesn't hold the whole grain bill. Probably took me no more than 5 min to grind 12 lbs with a cordless drill. No idea what speed but it was set on low, about 1/4 throttle. Tried to mimic what I figured I'd get grinding it by hand.