4x hopper speed shulker loader from water stream

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I needed a fast shulker box loader that is still fast while being supplied by a water stream. Other designs that I saw require a loading time to get all the hoppers and droppers full. The system Im working on requires a shulker box be filled from a water stream and then sent off as fast as possible. 4x hopper speed fills the shulker box in \~173 seconds assuming a steady supply of items.

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SMALL FIX: place bottom slabs above the top hoppercart incase of overflow to prevent the bottom ones from pulling them when the item stream stops, which will cause uneven distribution of items.