Minecraft wiki entry for Honey_farming, associated text: Note: Tiling the design as shown in the bottom two sidebar images will make the dispensers inaccessible — the grass block in front of the dispenser needs to be replaced with a slab, fence, or trapdoor so the dispenser can be refilled with empty bottles. The top hopper in each row must be set up with 2 honey bottles in the first slot, and 11-13 "junk" items (stackable to 64) spread across the other slots. As honey is collected, one bottle is kept in the lower hopper, but bottles after that are passed on to the output.