The gravity dupe is a (still only partially operational) fully AFKable system that, once complete, can be used to dupe most gravity affected blocks at (almost) hopper speed. It cannot dupe anvils or dragon eggs.
For anvils, we have the iron vortex, and for dragon eggs, the dupe at the First Stronghold close to old spawn should still work.
The AFK spot is in the End, right by the exit portal.
The storage is at spawn. There are 3 entrances:
It processes items at double hopper speed, and (once done) features storage for
All dupable items get loaded into shulker boxes, half of which get stored, and half of which sent back to the End (see below). Other items are initially sent to overflow chests, and if these fill up, they are packed into mixed shulker boxes.
The player places blocks that are then pushed into the portal, duping them and sending them to spawn as items. At spawn, the items are packed into shulker boxes, of which half are stored, and half are sent back to the End through an item transport line that chunkloads itself when items pass through by sending items back and forth between the Nether and the Overworld. Then, in the End, the shulker boxes are unloaded again. The empty shulker box is sent to the gravity block dupe storage, which is at spawn, and its former contents are dropped to the AFK player, completing the cycle.
Meh. Boring.
The system is currently incomplete. Some things that still need to be done:
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