IMPORTANT:
1) Don't place the minecart in the nether until you need a backup shulker, as mobs may spawn and bump into the minecart and send a shulker into the overworld part of the farm, which causes it to break.
2) If your shulker isn't at full health when loading into the farm (for example, due to hitting itself with a bullet), use a splash potion of healing or regeneration on it before starting the farm.
3) There is a bug in Minecraft that can cause shulkers to accumulate in the backup area in the nether, effectively creating a mob switch. An easy way to prevent and fix this issue is to go to the end of the back up area and pillar up on 9 soul sand blocks, then place a wither rose under you, and place a soul sand block over you:
[ Ссылка ]

This extremely simple shulker farm lasts *several hundred hours* on average without restocking, averaging ~100,000 shells (or ~200,000 duplications) before failure. Can be built in about 30 min, not counting time to move and load the shulker. Can be upgraded to automatically reload to run indefinitely. Tutorial for easily moving a shulker from the End to Overworld.

Discord: [ Ссылка ]

LITEMATICA FILES AND WORLD DOWNLOAD:
[ Ссылка ]
[ Ссылка ]
WDL: [ Ссылка ]

The farm produces 236 shells/hr, which is enough to store over 200,000 items per hour. Most players do not need a faster shulker farm because you won't be able to fill the shulker boxes faster than the farm can produce them.

0:00 Intro
0:45 Materials, plus minecart
1:05 Mechanics
5:21 Build tutorial
13:14 Shulker loading, READ VIDEO DESCRIPTION
18:25 Longevity and productivity
18:51 Restocking
19:41 Overview of restocking portal
19:58 Exit Portal example with different surrounding terrain
20:04 Alternate grinder using wither roses
20:59 Zombie piglin choir

NOTES
1:53 The scaffolding protected the new shulker from being hit with its lid closed.
5:21 *Remember that EXISTING PORTALS in the overworld and nether may interfere with the farm if they are too close. Choose your build site accordingly.*
5:35 If you don't build in a spawn chunk, you should build a chunk loader for the farm near the build limit in the nether and matching Y level in the overworld. Even if you build in a spawn chunk, using a chunk loader will keep the farm running when there are no players in the overworld. River biomes are a good choice if your spawn chunks are in hot biomes.
8:52 The grinder can be placed under the nether roof as well, but the reloading system assumes that the nether side of the farm is higher in altitude.
9:14 I made a math error when dividing the Z coordinate by 8, but the farm still works.
15:48 In 1.19.4+ Paper servers, Shulkers in minecarts cannot teleport through end gateways. Here is a workaround: [ Ссылка ]
16:00 If someone enters the End dimension, the rails on the platform will be removed by the game, but the rails will remain intact when using a gateway.
16:35 I should have worn elytra.
17:48 If you think your shulker isn't at full health, use a splash potion of healing or regeneration on it before starting the farm.
18:25 There is a LOT of variation in the longevity of the farm, and some players will get a lot luckier than others. My best estimate is about 100,000 shells on average, based on 1700 hr of tick warping, plus statistical analysis of shulker health, and some theoretical considerations.
19:41 Make sure that the portal is more than 8 blocks away from the farm below so that shulkers cannot teleport there. The sign protects the underside of the soul sand block from teleportation while letting the minecart fall through.

MISSING BOATS &
ALTERNATE GRINDER
The boats will break on occasion due to being hit by a shulker bullet. This normally happens very rarely - maybe once every several hundred hours. The farm only needs 1 boat to operate, but if you notice that a boat is missing, it is best to turn the farm off and reinstall the missing boat. If you have wither roses, use the alternative grinder design at 20:04, which doesn't have any boats or minecarts that could break from stray bullets.

REFERENCES:
youtu.be/jaC0YUpKlIs
youtu.be/4nNXxyz8yXQ
youtu.be/uLR15b8wgAo
youtu.be/xaD8Qyi942Y

BUGGED SHULKERS
Very rarely (maybe once per thousand hours) a shulker may not open its shell, and yet it will be able to fire off shulker bullets. The scaffolding will protect this shulker from harming itself, but the farm will not produce shells. This is easily fixed by restarting the game or server.

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