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  1. Minecraft: Java Edition
  2. MC-6162

Unexpected behavior with stacked hoppers and chests

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    • Icon: Bug Bug
    • Resolution: Works As Intended
    • None
    • Snapshot 13w01b, Snapshot 13w02a, Snapshot 13w02b, Snapshot 13w03a, Snapshot 13w04a, Snapshot 13w05a, Snapshot 13w05b, Snapshot 13w06a, Snapshot 13w07a, Snapshot 13w09a, Snapshot 13w09b, Snapshot 13w09c, Snapshot 13w10a, Minecraft 1.5
    • Community Consensus

      Perhaps not a bug. I'll let you be the judge. (Sorry for the wall of text.)

      The attached screenshots tell a bit of a story. The first shows the front of a simple sorting system built with chests and hoppers (in the back). Items are put into the top hopper (perhaps by water stream). Shot #2 shows that inside each chest is at least one of each item (as labeled) so only that items gets put into that chest. Shot #3 shows the back, including a fourth hopper at the bottom to catch anything that doesn't fit into the chests.

      Now, the behavior I would expect goes like this: Seeds, wheat, and eggs would get into the top hopper. After a time all of the seeds would be in the top chest, all of the wheat would be in the middle chest, etc. Anything not seeds, wheat, or eggs would end up in the bottom-most hopper.

      What actually happens is the top hopper tries to put seeds into the top chest, and sometimes succeeds. But, the second hopper starts pulling items out of the top hopper, so they start competing to grab items. Some seeds get into the chest as intended, but some get passed down the system with nowhere to fit and end up at the bottom hopper. The same is true for the wheat and the eggs. Shot #4 shows the contents of the bottom hopper, containing items that should be in chests higher up.

        1. test.zip
          230 kB
        2. Partial Workaround.schematic
          0.5 kB
        3. Hopper Item Sorter.schematic
          0.6 kB
        4. 2013-01-17_18.36.44.png
          2013-01-17_18.36.44.png
          416 kB
        5. 2013-01-16_22.00.43.png
          2013-01-16_22.00.43.png
          216 kB
        6. 2013-01-04_20.16.45.png
          2013-01-04_20.16.45.png
          293 kB
        7. 2013-01-04_20.16.11.png
          2013-01-04_20.16.11.png
          258 kB
        8. 2013-01-04_20.14.02.png
          2013-01-04_20.14.02.png
          424 kB
        9. 2013-01-04_20.12.49.png
          2013-01-04_20.12.49.png
          502 kB

            Unassigned Unassigned
            rocketturtle Rocket Turtle
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            37 Vote for this issue
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              Created:
              Updated:
              Resolved:
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