Slime Farm
A slime chunk farm built below Y=40 that uses iron golems as bait and magma blocks to kill slimes. Produces slimeballs passively. Uses the slime chunk algorithm to identify valid spawn chunks.
Overview
The Slime Farm is a farm build whose job is producing a steady supply of one resource with little or no manual labour; form follows function here, so the layout is dictated by how it works rather than by looks. At 16x40x16 blocks (16 wide, 40 tall and 16 deep) it is huge, covering a 256-block footprint on the ground.
It is rated intermediate: nothing here is exotic, but you will need a steady supply of materials and a little patience with shaping, depth and interior detail to make it look right. Following the 20 steps below, plan for roughly 2-3 hours of focused building. This is a survival workhorse for slimeballs: once the Slime Farm is running it keeps producing whether you are standing there or off mining elsewhere within simulation distance.
The bulk of the work is the 256 slabs that form the main body, alongside 6 different materials in total (about 424 blocks and items all told). Items move through it on hoppers, feeding the slimeballs into a collection chest without any wiring to time. Lighting comes from magma block, which both finishes the look and stops mobs spawning in or on the build.
Materials Needed
Gather the 256 slabs first, since it is the most-used block; the remaining 5 materials are accents and fittings used in smaller amounts. Mine roughly 10-15% extra of the main block to cover mistakes and a few decorative changes on a build this size. Make sure the hoppers that move items are crafted ahead of time, as those are the pieces most likely to be missing mid-build. Quantities are sized for the dimensions shown, so scale them up proportionally if you build a larger version.
| Material | Quantity |
|---|---|
| Iron Block | 12 |
| Pumpkin | 4 |
| Magma Block | 128 |
| Hopper | 16 |
| Chest | 8 |
| Slab | 256 |
Click any material to view it on the Items database.
Step-by-Step Overview
A high-level construction order for the Slime Farm, from the ground up. Each phase below covers several of the 20 in-game steps.
- 1Pick the spot the Slime Farm needs — a valid spawning location for the mobs it targets — then clear it and build the hopper-and-chest collection layer first so no drops are ever lost.
- 2Raise the body of the Slime Farm to its full 16x40x16, working from the collection floor upward so each layer sits on the last.
- 3Set up the working part of the Slime Farm — a slime chunk or swamp lit and funnelled — which is what actually produces the slimeballs.
- 4Light or darken precisely: the spawn space for the Slime Farm must stay at the light level the target mobs need, while every surrounding surface is lit so nothing else spawns and steals the cap.
- 5Build the AFK or harvest spot, run the Slime Farm for a full cycle, and time the slimeballs output before you rely on it day to day.
Build Tips
- 1Use a slime chunk finder (seed-based) to locate valid chunks before digging.
- 2Build multiple spawn platforms at different Y levels (Y=6 to Y=39) for higher rates.
- 3Iron golems attract slimes from up to 16 blocks away, funneling them to the kill zone.
- 4Light the platforms to prevent other hostile mobs from spawning and filling the mob cap.
Tips & Variations
Keep mobs out by spacing your magma block so no floor tile or nearby surface in the Slime Farm sits below light level 1; a single dark corner is all it takes for something to spawn inside.
To resize the Slime Farm, keep its 16x16 proportions and grow both axes together; stretching one direction alone tends to make it look thin. A half-size or double-size version both work as long as you scale the 424-block material list to match.
For a different look, swap the slab in the Slime Farm for another palette that fits your biome: the shape stays identical, but the colour and texture of the main block changes the whole feel of it.
The most common mistake on the Slime Farm is a leak in the collection path; trace it and confirm every hopper, water flow or drop chute actually feeds the chest before you leave it producing slimeballs unattended.
Frequently Asked Questions
How hard is the Slime Farm build?
It is rated intermediate: nothing here is exotic, but you will need a steady supply of materials and a little patience with shaping, depth and interior detail to make it look right. It is laid out in 20 steps and takes roughly 2-3 hours of focused building to finish.
What blocks do you need for the Slime Farm?
The main block is slab (around 256), and the full list runs to 6 materials — mostly slab, magma block and hopper. Altogether that is roughly 424 blocks and items; the complete table with exact counts is above. Item transport uses hoppers.
How big is the Slime Farm?
It measures 16x40x16 blocks — 16 wide, 40 tall and 16 deep — which is huge and takes up a 256-block footprint. You can shrink or enlarge it by keeping those proportions.
Is the Slime Farm survival-friendly?
This is a survival workhorse for slimeballs: once the Slime Farm is running it keeps producing whether you are standing there or off mining elsewhere within simulation distance.
Does the Slime Farm work on its own once built?
Largely, yes — after setup the Slime Farm keeps producing slimeballs as long as you are within simulation range; just check the collection chest now and then and top up anything it consumes.
What makes the Slime Farm different from similar builds?
It is best understood through its focus on slime, slimeball and underground. Those traits drive the material list and layout described above, and are what set this farm build apart from a generic slimeballs build.
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