Slime Farm
Intermediate Java + Bedrock
Produces: Slimeballs (0-2 per small slime, +1 with Looting) - a large slime yields around 9 slimeballs on average
Quick answer: Slimes spawn below Y=40 in special slime chunks (about 1 in 10 chunks, any light level) or on swamp surfaces between Y=51-69, most on full moons. Dig out a slime chunk, bait the slimes with an iron golem and let gravity or magma do the killing.
How it works
- About 1 in 10 chunks is a slime chunk: slimes spawn there below Y=40 in any light. In Java the chunks depend on your world seed; in Bedrock they are at the same coordinates in every world.
- The swamp option: slimes also spawn in swamps and mangrove swamps between Y=51 and Y=69 at light level 7 or less, most often on a full moon and never on a new moon. No digging required, but spawn rates are lower than in slime chunks.
- A slime looks for a player, or failing that an iron golem, within 16 blocks, so a caged iron golem can pull slimes toward it.
- Large and medium slimes split on death; only the smallest size drops slimeballs. A large slime gives about 9 slimeballs on average (0-32).
- A slime needs a clear space of about 2.04 blocks in each direction to spawn, so spawn platforms use a 2.5-block gap.
Materials
- A slime chunk (chunk finders online use your seed; in Bedrock, any published slime-chunk map works for every world)
- Pickaxes and patience: the classic design digs the whole chunk out below Y=40
- 1 iron golem + blocks to cage it, or a few frogs
- Torches, hoppers, chests, and magma blocks or campfires for the kill floor
- Optional: water to push slimes (they float and flail, but currents still move them)
Build steps
- Find your chunk: use a slime chunk finder with your seed (Java), or a Bedrock slime chunk map (same coordinates in every world).
- Dig out the chunk and build spawning platforms with a 2.5-block gap (slabs help).
- Light the surroundings a little: slimes spawn in any light in slime chunks, but other hostile mobs should not fill the mob cap.
- Build a kill system: slimes can be washed into a cactus trap (it destroys about 20% of the slimeballs) or into drowning traps that split and finish them.
- Collect with hoppers into chests.
- AFK within 128 blocks of the spawning platforms, and spawn-proof the other areas in that range.
Rates
Output depends on the design, the version and how much of it you build, so we do not quote an hourly figure. Build the layout below, time it for a few minutes in your own world and scale from there.
Tips
- Slimes in swamps need light level 7 or less; brown mushrooms (light level 1) on every spawn spot keep other mobs away.
- Since Java 1.21 a Splash Potion of Oozing plus a harming potion on a pen of mobs (silverfish work best) spawns medium slimes with no chunk needed.
- Source: minecraft.wiki Tutorial:Slime farming and Slime.