close. In SMP put the stuff you want duped in a small chest.
1 person opens chest to view contents. While they are viewing it, player 2 breaks it down, and takes what falls out. Player 1 then manually removes the items from the chest window. Store the excess in nearby large chests, and repeat as needed. Useful for projects involving unusual materials, like an iron block robot man statue, or an obsidian castle.
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