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ianxofour | Minecraft Elegance: Instant Concrete Factory (Sand, Gravel, Flint, Java 1.21+, 28.8k/hr) @ianxofour | Uploaded 1 month ago | Updated 6 hours ago
A surprisingly fast (28.8k/hr) and simple concrete factory that dupes concrete powder, converts them to concrete with instant water flow, and breaks them for collection using the new mechanic in 1.21 that breaks blocks over the obsidian platform when new entities arrive in the end dimension. Also dupes sand and gravel, and produces flint when duping gravel.

0:00 Intro
1:52 Materials list
2:05 Mechanics
5:23 Build tutorial
13:10 Usage instructions
14:38 Dry platform upgrade
15:15 Outro

FAQ:
"Not all of the concrete powder is being converted." or "the instant water stream isn't forming." The most common reason is not following the usage instructions 13:10, in the order specified in the video. Also be sure not to enter the end while the farm is running.
"Can you use more portal sides or multiple stronghold portals to increase the rates?" No, the timings for powder conversion and instant water flow restrict the maximum rates for the farm.
"How can I use both the Instant Concrete Factory and the Instant Obsidian Farm?" I recommend building up a lifetime supply of obsidian first, then tearing down the obsidian farm. Alternatively, use 2 different strongholds and rebuild the portion of the desired farm as needed. Both farms are very easy to rebuild in the end dimension.
"Can you dupe concrete powder without converting it to concrete?" Chunk load the farm and start the concrete factory without placing the dummy block in front of the observer. Teleport to the obsidian platform and remove the overhead water source. Move most of the player inventory to a chest temporarily so that you can collect drops manually by standing near the middle of the platform. Occasionally move the drops into chests to make more room.
"Does this dupe dragon eggs or anvils or scaffolding?" No

IanXO4's Discord Server: discord.gg/G9aa2YTTQX
World Download: mediafire.com/file/wpq2mzh3a1fq4zx/IanXO4+Instant+Concrete+Factory.zip/file
Litematica files:mediafire.com/file/dl0go1s93b4jevy/IanXO4_Instant_Concrete_Factory-Stronghold.litematic/file
mediafire.com/file/5112uieyvcgq815/IanXO4_Instant_Concrete_Factory-End.litematic/file

NOTES
4:40 The redstone dust that activates the secondary piston can be a dot instead of a cross for a tiny improvement in lag.
10:14 The redstone dust in the corner (behind the repeater) can be replaced with a solid block.
13:15 The gravity blocks can be loaded in the same way as 8:31. You’ll need to remove any existing gravity block first, of course. Removing an existing gravity block might result in the item touching the portal, so that it teleports to the end and deletes the blocks over the platform. This is why it’s important to place the dummy block on the platform only after the new gravity blocks are loaded.
13:20 The dummy block can be glass if you don’t want to waste a slot in storage.
13:58 The duper modules must all be within the 3x3 entity processing chunks surrounding the chunk loader. Falling gravity blocks are actually entities, so they require processing for duping to work.
14:10 If you have another batch of gravity blocks to dupe, it's best to switch out the gravity blocks in the dupers before going to the end. Once on the platform, place the dummy block against the observer, and then collect your drops. Head back to the stronghold and flip the lever.
14:17 It’s normal to find a few unconverted concrete powder blocks in storage. It takes a moment after the farm starts for the instant water stream to form so that powder blocks can be converted to concrete.
15:03 It really is important to wait at least 2 seconds after pushing the button to place the dummy block in front of the observer.
15:15 Cover the clock to prevent accidental changes to repeater delays. Remove the blocks under the portal if you like, which can make it easier to switch gravity blocks.
15:25 An interesting duping configuration that requires only 4 observers.

REFERENCES
Practical Concrete Factory: youtu.be/BkZz7jNSE7c
Redstonia’s Sand Duper: youtube.com/watch?v=B0gUz2X7BR8
FX-Pr0cess' Instant Liquid Flow: youtube.com/watch?v=9QpinJYueWA
Dark’s Simple Chunk Loader: youtube.com/watch?v=jY9L4Xrohm4
Redstone Tweaks Resource Pack: modrinth.com/resourcepack/redstone-tweaks

PAPER SERVERS
I have several reports that the farm doesn't convert concrete powder to concrete blocks on Paper servers, and no reports of success. I don't recommend building this on Paper servers. If you would still like to try anyways, you'll need to make the following changes to the paper.yml configuration file.
allow-unsafe-end-portal-teleportation set to true
allow-permanent-block-break-exploits set to true
Paper-friendly chunk loader: youtube.com/watch?v=FosDMBCaDh0
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Minecraft Elegance: Instant Concrete Factory (Sand, Gravel, Flint, Java 1.21+, 28.8k/hr) @ianxofour

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