The 1.21 slime farm was one of prop’s Season 3 planning-forum projects. He first posted the video he wanted to copy on 30 July 2024 1. The trick: silverfish spawned by the Infested effect are also given Oozing, so they drop slimes when they die. His one worry was that it “might kill the server” 2.

He returned to the same video in November 3, and on 10 November posted the full materials list. It was not small: 166 glass, 64 chests, 49 hoppers, 21 soul campfires and 15 crafters, among many other things 4. The design adds allays and crafters to collect and process the slimes. The sources record the plan and shopping list but not a finished farm.
Pictures
Primary sources
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www.youtube.com/watch?v=j_BPhn7nVw4
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might kill the server
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youtube.com/watch?v=j_BPhn7nVw4
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- 🔴 166 Glass(2 stacks and 38) - 🔴 64 chests - 🔴 64 building blocks - 🔴 49 hoppers - 🔴 29 redstone dust - 🔴 21 soul campfires - 🔴 15 crafters - 🔴 11 trapdoors - 🔴 6 Cobwebs - 🔴 6 observers - 🔴 4 redstone comparators - 🔴…
