Four-piece grinders or kief catchers are the preferred alternatives because of such things. It is the standard and by a long shot, the most unique technique for collecting kief. The difference between a two- or three-piece grinder is the possession of a kief catcher at the bottom chamber, underneath a fine screen to hold the kief that drops off the buds on shredding. There is a method of maximizing the collection process of kief from your grinder.