1.7.10 Duplication Glitch
Kanisha Dezarn
This page seeks to teach you how to clone items and blocks without building a separate farm for them, in vanilla Survival mode. It can be treated as an "everything farm," since it can "farm" things that can't normally be farmed, like block of diamonds, dragon eggs and other non-renewable blocks.
If any of these do get patched, you must either go back versions or use third-party applications in order to replicate them again. For Java Edition, this can happen in the Minecraft Launcher, but on Bedrock Edition, you must use third party applications in order to replicate these again. These third-party applications are NOT owned or endorsed by Mojang, so use at your own risk.
Note that these techniques are considered "cheating" by many people and Mojang tries to remove the ability to duplicate in Survival during almost every update, except for primed TNT duplication, which has been left in on purpose until a suitable replacement exists. On most servers, duping inventory items is a bannable offense.
The best way to duplicate a block is to turn it into an item first, then duplicate the item. However, there are other ways to duplicate the blocks themselves, though they only work for certain blocks. Shulker boxes make item duplication much easier because they allow for up to 1,729 items to be cloned at once (including the shulker box).
If you happen to be a speedrunner, duplication if allowed can cut down a lot in your game time. One extreme example is the TAS Any% speedrun done in 29.19, complete with the dragon dead. Alt+F4 is usually used for this purpose.
Why do we care about mods? Although we, being the official wiki, do not endorse the use of mods, mods are a fact of life we must accept. Servers commonly use them to fix the very glitches we are talking about here and, by some tweaking of the game, do whatever the server owner want the game to do.
Start by obtaining at least 2 dirt and gravel from bartering. Next, craft coarse dirt using 2 dirt and 2 gravel for 4 coarse dirt, then till the dirt and mine it to obtain 2 extra dirt. With a bartering farm, a good hoe, and a good shovel, you can mass produce dirt in a matter of minutes. However, this is not perfect duplication, as you will need a constant supply of gravel.
By using bone meal and composting the yield, the player gets bone meal back. Usually, this method yields significantly less bone meal than is used, and is therefore not profitable, but the following methods do duplicate bone meal:
"Void trading" is a way to trade with villagers and wandering traders without restocking. To do that, a player unloads the villager before closing the trading interface, so that the villager never "remembers" having been used for trading. Infinite trading is good for turning farmed items such as Sticks from a Bamboo farm into emeralds, or for buying things.
Currently, work as of the latest release of vanilla Minecraft. They may be patched in modified servers (such as Spigot, or Paper), which many servers use, but have been tested and they still work in unmodified conditions. In singleplayer, these will work but in multiplayer, these will usually not work.
This method is safe and reliable. Needs only the desired items for duplication as well as a chest. You need to have access to save files so this is impractical on servers, where admins aren't giving FTP out like candy.
Extra info: these files also contain your current location and your exp. Theoretically, you can enchant some gear, deposit it in a chest, then load the level.dat file to preserve your level and keep the enchanted gear. Another potential use is to use up your inventory while building then load a backup to keep your progress and refill your inventory with the building material. You could even use this to try multiple times to kill the Ender Dragon / Wither without risking your gear and inventory.
Disclaimer: the environment and mobs are not saved with this method, do not attempt to summon the Wither near places of importance or important mobs. Instead, backup the entire target world folder and load it in event of failure. Perform test runs to ensure that this method works.
This duplication glitch works on 1.16.5 multiplayer. It requires an elytra and firework rockets that deal damage to the player. If the rockets do not damage the player, the duplication will not work. Video below: (duplication glitch starts at 0:33)
The mechanism for growing giant spruce trees is known to be glitched in JE 1.16 snapshot. Instead of growing a giant tree on the saplings, the game grows the tree on the first position where space is sufficient and a dirt block is present in the north-west position. When the tree is grown, all the dirt blocks are filled in. With bone meal and piston automation, a semi-auto dirt duplicator can be produced (YouTube by ilmango).
Bring an animal to the end, put a lead on it, and then lead it into the end portal. When you get back, it should have dropped two leads. Sometimes one of the leads ends up in the end, so make sure to check there. It may not always be in the end, though. This also works when bringing animals into the nether.
This duplication glitch works on Singleplayer and Multiplayer. All you have to do is place a chest in front of you and then leave the server as it saves your player data, then relog and put the items you want to dupe from your inventory in the chest, get a book and quill, overload the book with excessive characters and it will cause you to get kicked from the server and rolling back your player data to last save while server files stay the same. As a result, the items will be in both your inventory and the chest.
Carpets can be duplicated using a contraption made of two Slime Blocks, a Sticky Piston, and an Observer. This glitch gives infinite fuel and is very easy to automate give thousands of carpets per hour tutorial: =ezM2Hs_-hbE
Whenever the dragon lands on the end portal and releases the purple fog, be above or below the purple fog, look at the fog at a steep angle, and proceed to harvest the dragon's breath. The fog will first shrink as intended, but after it reaches the smallest size, it will expand with each bottle used, and keep expanding until the fog disappears as too much time passed. (YouTube by Underscored Frisk)
Shulker Box dupe allows you to duplicate any item in Minecraft singleplayer or Realms. This glitch works with 2 players or with an auto mine mod. So you quickly spam your item in and out while it being broken. The key is to take the item out just before the shulker box breaks. This may take a few tries but eventually you will dupe your items.
You can also use autoclicker with these settings: time between clicks- 1sec 487milisecs. Then you bind the autoclicker to key n, and automine to key m and press n,m,right click at the same time. This opens shulker. Hover over item you want to duplicate - shulkerbox should break and item in it, and item on the ground.
TNT duplication works in a similar way as rail duplication. A TNT block is BUD-powered, such that when the contraption is pushed by a piston, the TNT is updated and ignites into a primed TNT entity. Then, the piston moves the TNT from the list of TNT block left. This doesn't so much duplicate the TNT block as it creates free primed TNT entities from it without deleting it. Many TNT duplicators still work, but unless properly constructed will blow themselves up.
One common TNT duplication design uses a minecart on a detector rail to power the slime block it is placed on, and moves a TNT block next to a coral fan underneath, the combination of the TNT and the coral duplicates the TNT whenever the whole contraption is moved forward with a piston. For an indepth tutorial of this one checkout Cheesysponges video
The second slice may be placed on either side, and the coral fan has been marked with vines. To prime the mechanism, the upper slime blocks must first be moved forward, pushing the TNT under the rail. After this, moving the whole assemblage forward with a piston will duplicate the TNT, spawning a lit TNT entity directly below the TNT block.
For a list of variations, see e.g. [1]. TNT duping as a glitch is notable in that it has been patched by Mojang Studios several times in the past but was ultimately allowed in the vanilla game due to its immense value to the technical community. In the words of Mikael Hedberg, "TNT dupers fill a slot in the game that the intended game mechanics still cannot."
A gravity-affected block is pushed toward an end portal. It becomes an entity as it falls into the portal, and it travels into the other dimension's "spawn point.", but before it's removed from the original dimension, it bounces off an entity in the portal (in a vehicle so it won't go through), and is caught by some pistons. It then turns into a block and is returned to its original location. This process can be looped using redstone. It works for any block that is affected by gravity, except for primed TNT because it would blow up the contraption and cannot become a block again in any case.
Dragon eggs and anvils fall differently from each other and other gravity-affected blocks such as sand, gravel, and concrete powder. Neither dragon eggs nor anvils work in a sand/gravel/concrete powder duplicator because of this. However, it is possible to create a machine that can duplicate dragon eggs and anvils but not sand/gravel/concrete powder. They both can be duplicated and sent into the End as either falling entities or items.
This method is a simple method and has been around since Indev. This method involves dropping the items you want to duplicate, and then saving and quitting. You would then reload the world, pick up the items and press the keyboard shortcut to close a window. Then relaunch the game and reload the world. The items should be duplicated.
This method is extremely deadly, but not necessarily to the player. This method involves taking a mob that can carry items (e.g. a zombie, a donkey or a llama) down to very low health (i.e. half a heart or less). Using extremely precise timing, kill that mob as it travels through an end portal or nether portal. The items equipped and the mob should appear in the other dimension. It works by tricking the game into thinking the mob is alive on one end of the portal and dead on the other side. The live mob will travel through the portal still carrying the items, and the dead mob's items are also sent into the portal, allowing the player at the other end to collect the cloned items and the mob carrying them.
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