How to make a slime farm in Minecraft 1.21

Slime is a surprisingly useful technical Minecraft item. The material can stick blocks together, allowing large areas to be moved at once using sticky pistons, another block only available thanks to slime. They also don't stick to honey, allowing the two to be used in very creative ways. However, older slime farms were large, time-consuming, and complex to make.

Thankfully, 1.21 introduced the oozing potion, which makes it much easier to farm slime. These new farms don't even require any new layouts and can function off of old monster room farm designs.

Everything you need to know about setting up one of these new and incredibly simple slime farms can be found in detail below.

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How to make a slime farm using Minecraft 1.21's oozing potion

Materials

The incredibly cheap materials needed to make the farm (Image via Mojang)

The biggest advantage a monster room slime farm has over other designs is that, since monster rooms are underground Minecraft structures, you won't need blocks to build the foundation of the farm. This means that the farm is incredibly cheap to make, as there aren't any required building blocks outside of the hoppers, chests, and slabs needed for the collection system.

It's recommended to bring two different Minecraft water buckets along when making the farm. This will allow you to set up an infinite water source, making construction much easier.

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1) Find a monster room

A monster room found in a cave (Image via Mojang)

The first thing you're going to want to do to make a simple oozing slime farm is to find a monster room. One of the oldest structures in Minecraft, monster rooms produce a limitless and consistent stream of hostile mobs that can be used to farm slime, thanks to the new oozing potion.

This design will require either a zombie or skeleton monster room. Spiders are larger mobs and can climb walls, making it much harder for them to move around easily.

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2) Clear out the area

The mined-out area around the spawner (Image via Mojang)

Once you've found a monster room, you'll want to dig out four blocks from each face of the spawner. This is the extent of the area that the spawner can produce mobs in, so freeing up all the blocks will increase rates. Make sure to add a row of blocks directly on top of the spawner to stop mobs from appearing there and getting stuck. Light up the area as you go to prevent hostile mob spawns.

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3) Add water

The water placed into the farm (Image via Mojang)

Next, you'll want to add a row of source blocks to the far side of the wall. This will create a wall of flowing water that stops one block shy of the opposing side of the chamber. Dig down one block along this dry patch, and place another water source block on one end. This will force all the mobs that spawn on the farm into a single spot.

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4) Finish the water trail

Mine blocks until the water stops flowing (Image via Mojang)

Mine down one block on this collection spot, and then place a water source block. From here, dig two blocks away from the spawner. Then, turn right and dig until there's a single block in front of the flowing water. This is the final stream that will push mobs into the collection area.

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5) Dig a pit

This pit can be any number of blocks that won't kill the mobs (Image via Mojang)

Dig a pit down from the end of the curved water trail. This example farm uses the minimum depth of 4 blocks, but any number will work. Higher drops will leave mobs with less health, making it faster to process slime.

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6) Add a collection system

The collection system added to the farm (Image via Mojang)

The final step is to add the collection system. Place a chest with a Minecraft hopper on top of it at the bottom of the pit you just dug. Add another hopper to each side of the original, facing toward the center. Break the blocks above these hoppers. These side rooms will collect any slime that is spit out as the main mobs die.

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7) Break torches

Break the torches to start the farm (Image via Mojang)

The final thing to do before the farm is operational is to return to the spawner room and break all of the torches. Be careful, though, as hostile Minecraft mobs will begin to spawn as you do this. Make sure to bring food and armor to keep your health high.

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8) Profit

The farm can be used to get slime as soon as mobs start dropping (Image via Mojang)

From here, you'll need to grab a Minecraft splash potion of oozing and return to your collection area. Wait for enough mobs to spawn that they start dying due to the entity cramming and throwing the potion. Killing this huge number of mobs under the oozing effect will produce a huge number of slimes, which will then drop a ton of slime balls.

The farm can be made even more efficient with powerful Minecraft enchantments, such as looting. This enchantment increases the rate at which the slime produced will drop slime balls.