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Slime farming is a method of automatically spawning and killing slimes to easily obtain slimeballs, which can be crafted into slime blocks.

Both slime blocks and sticky pistons, which are crafted using slimeballs, are essential in many redstone builds. Slimeballs can also be crafted into magma cream, which is needed for brewing potions of fire resistance. Because slime blocks break instantly when hit (with a bare hand or any tool), they are useful for quickly displacing and clearing out volumes of water, even when under the effect of Mining Fatigue inflicted by an elder guardian.

Method[]

Pre-Build[]

Before building a slime farm, first decide whether to build it in a slime chunk or swamp biome. Every chunk that is generated in a world has a 10% chance of being a slime chunk. Within slime chunks, slimes can spawn when Y < 40. This method requires an underground room to be dug out before the farm is constructed. Slime spawning in swamps can occur between Y=51 and Y=69. This method has the advantage of not requiring a dug-out room prior to building the farm, and the size of the farm is not limited, unlike the slime-chunk method, although the spawn rates are lower in a swamp.

Necessary Chunk Mining for Selected Confidence Values
Chunks Mined Probability of Finding at least 1 Slime Chunk (%)
07 52.17
14 77.12
16 81.47
22 90.15
29 95.29

Alternately, you can use the Chunkbase Slime Chunk Finder app to locate chunks for your game seed.

Spawning[]

The first step in constructing either farm is the spawning place. In most farm designs, spawning platforms are created which spawn slimes that are then moved to a killing trap, usually a drowning trap to split larger slimes down and dispatch the smallest size. Spawning pads are usually constructed with a 2½-block gap using slabs, to allow all types of slimes to spawn. It is important to light the spawn platforms up, otherwise other hostile mobs can spawn too. It is also recommended to light the area in a 128-block radius around the farm, to keep the hostile mob cap as low as possible.

Slime Spawning On Light-Emitting Blocks
Icon Block Can Spawn
Beacon JE6 BE2.png Beacon No
Campfire JE2 BE2.png Campfire No
Conduit JE1 BE1.png Conduit No
End Gateway JE2 BE1.png End Gateway (block) No
End Portal.png End Portal (block) No
Glowstone JE4 BE2.png Glowstone No
Fire.png Fire No
Lava JE5.png Lava No
Lava Cauldron JE1.png Cauldron containing lava No
Jack o'Lantern (S) JE4.png Jack o'Lantern Yes
Lantern JE1 BE1.png Lantern No
Lit Redstone Lamp JE3 BE2.png Redstone Lamp Yes
Respawn Anchor (Charges 1) JE1.pngRespawn Anchor (Charges 2) JE1.pngRespawn Anchor (Charges 3) JE1.pngRespawn Anchor (Charges 4) JE1.png Respawn Anchor Yes
Sea Lantern JE1 BE1.png Sea Lantern No
Sea Pickle 1 JE1 BE1.pngSea Pickle 2 JE1 BE1.pngSea Pickle 3 JE1 BE1.pngSea Pickle 4 JE1 BE1.png Sea Pickle No
Shroomlight JE1 BE1.png Shroomlight No
End Rod (U) JE2 BE2.png End Rod No
Cave Vines Plant (berries) JE1 BE1.pngCave Vines (berries) JE1 BE1.png Glow Berries Yes
Torch JE6 BE2.png Torch Yes
Lit Blast Furnace (S) JE1.png Blast Furnace Yes
Lit Furnace (S) JE4.png Furnace Yes
Lit Smoker (S) JE1.png Smoker Yes
Candle JE1.pngTwo Candles.pngThree Candles.pngFour Candles.png Candle No
Glowing Obsidian BE1.png Glowing Obsidian Yes
Nether Portal (EW).gif Nether Portal (block) No
Soul Campfire.png Soul Campfire No
Soul Fire.png Soul Fire No
Soul Lantern.png Soul Lantern No
Soul Torch JE1.png Soul Torch Yes
Ender Chest (S) JE2 BE2.png Ender Chest No
Glow Lichen (D) JE1.pngGlow Lichen (E) JE1.pngGlow Lichen (N) JE1.pngGlow Lichen (S) JE1.pngGlow Lichen (U) JE1.pngGlow Lichen (W) JE1.png Glow Lichen Yes
Redstone Torch JE4.png Redstone Torch Yes
Amethyst Cluster (U) JE1.png Amethyst Cluster No
Magma Block JE2 BE2.png Magma Block No
Brewing Stand.png Brewing Stand No
Brown Mushroom JE2 BE2.png Brown Mushroom Yes
Dragon Egg JE1 BE1.png Dragon Egg No
End Portal Frame (S) JE5 BE2.png End Portal Frame No
Inactive Sculk Sensor JE1.png Sculk Sensor No
Light 0 JE3.pngLight 1 JE3.pngLight 2 JE3.pngLight 3 JE3.pngLight 4 JE3.pngLight 5 JE3.pngLight 6 JE3.pngLight 7 JE3.pngLight 8 JE3.pngLight 9 JE3.pngLight 10 JE3.pngLight 11 JE3.pngLight 12 JE3.pngLight 13 JE3.pngLight 14 JE3.pngLight 15 JE3.png Light Block No

Transportation[]

The second step in building a slime farm is transportation. In pre-1.8 traps, this is usually achieved by using 'canals' of water separated by signs. As slimes can swim in snapshot 14w06a and above, specific water placement is required in Java Edition 1.8 and above. Or using an iron golem to attract the slime to the killing spot.

Separation and killing trap[]

The final step in building a slime farm is the separation and killing trap. To separate the different sizes down to the smallest, a drowning trap is usually used. The largest type of slime is split to the medium size, and medium to small. The slimes are then taken off to another trap to be killed, usually another drowning trap. Separation trap could be used as a killing trap also.

Alternatively, a water stream carrying the slimes flowing into a cactus trap can be used. Hoppers around the base of the cacti then collect the drops. This has the advantage of killing all sizes of slimes without the need for separation. A downside of this method is that the cacti destroy around 20% of the slimeballs that are dropped.

A quick and lossless method for killing slimes is using magma blocks. Slimes can either be pushed there with a water stream, drawn there by iron golems, or allowed to roam off the side on their own. A hopper minecart track underneath the magma blocks can be used to collect the drops.

For an interesting option, vindicators named "Johnny", or zoglins attack all slimes, but the slimes never retaliate.

Item collection (optional)[]

To automatically collect the slimeballs produced by the farm, create a hole below the end of the trap, with hoppers feeding into one or more double chests.

Basic survival build[]

The simplest slime farm that requires the least amount of resources is Jioge's 1.8 slime grinder, which has been tested to work in 1.16. This farm requires a spawn chunk, at least 9 signs, 3 hoppers and a chest, and many torches. Glass blocks are also helpful (particularly on top of the chest so that it can still be opened without letting water or slimes into the collection room). Because slimes can swim upward and horizontally, it is important to note how water is placed in the drowning trap.

Rarely, a wandering trader and its trader llamas may spawn in this farm and drown, leaving you with a lead and a piece of leather in your collection chest. Also, if not adequately lit, undead mobs may spawn in this farm and collect in the trap without dying. An observation deck above is useful for letting you fire an arrow into an opening to clear out any "by-catch" mobs.

Other designs[]

Other more elaborate designs require more exotic and expensive resources.

Mysticat's 1.15+ Easy Slime Farm 3-minute Tutorial[]

A very simple design that gets you enough slimeballs without being overkill.

ilmango's 1.10+ Slime Farm (18,200 slimeballs/h)[]

This slime farm's design is quite different from most of the others. It uses fewer spawning pads, which, due to the way the slime spawning algorithm works, increases the spawning rates (see video for more details). The slimes are then lured off of the platforms using iron golems and killed by magma blocks.

Mikedcraft 15's design[]

This design saves time in the pre build stage by only having one spawning platform and having the Iron Golems in the platform itself. It requires iron golems to kill the slimes on the spawning platform, with minecarts running on powered rails below to collect the slimes and pass over a hopper which moved the slimes into a chest.

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