Mob Spawner XP Farm
Converts a dungeon mob spawner into an efficient XP farm. Mobs spawn, fall through water channels, and collect in a kill chamber where you deal the final blow for XP.
Overview
The Mob Spawner XP 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 9x12x9 blocks (9 wide, 12 tall and 9 deep) it is moderately sized, covering a 81-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 18 steps below, plan for about 45-60 min. This is a survival workhorse for XP and common drops: once the Mob Spawner XP 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 32 slabs that form the main body, alongside 6 different materials in total (about 64 blocks and items all told). Items move through it on hoppers, feeding the XP and common drops into a collection chest without any wiring to time. Lighting comes from torch, which both finishes the look and stops mobs spawning in or on the build.
Materials Needed
Gather the 32 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.
Click any material to view it on the Items database.
Step-by-Step Overview
A high-level construction order for the Mob Spawner XP Farm, from the ground up. Each phase below covers several of the 18 in-game steps.
- 1Pick the spot the Mob Spawner XP 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.
- 2Build the compact 9x9 platform and walls that hold the mechanism for the Mob Spawner XP Farm in place.
- 3Set up the working part of the Mob Spawner XP Farm — a dungeon spawner darkened and funnelled — which is what actually produces the XP and common drops.
- 4Light or darken precisely: the spawn space for the Mob Spawner XP 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 Mob Spawner XP Farm for a full cycle, and time the XP and common drops output before you rely on it day to day.
Build Tips
- 1Find a zombie or skeleton spawner for best results.
- 2Mobs must fall 22 blocks for one-hit kills with a sword.
- 3Light up surrounding caves to maximize spawner efficiency.
- 4Add a trident killer for fully automatic XP (1.13+).
Tips & Variations
Keep mobs out by spacing your torch so no floor tile or nearby surface in the Mob Spawner XP Farm sits below light level 1; a single dark corner is all it takes for something to spawn inside.
To resize the Mob Spawner XP Farm, keep its 9x9 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 64-block material list to match.
For a different look, swap the slab in the Mob Spawner XP 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 Mob Spawner XP 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 XP and common drops unattended.
Frequently Asked Questions
How hard is the Mob Spawner XP 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 18 steps and takes about 45-60 min to finish.
What blocks do you need for the Mob Spawner XP Farm?
The main block is slab (around 32), and the full list runs to 6 materials — mostly slab, torch and sign. Altogether that is roughly 64 blocks and items; the complete table with exact counts is above. Item transport uses hoppers.
How big is the Mob Spawner XP Farm?
It measures 9x12x9 blocks — 9 wide, 12 tall and 9 deep — which is moderately sized and takes up a 81-block footprint. You can shrink or enlarge it by keeping those proportions.
Is the Mob Spawner XP Farm survival-friendly?
This is a survival workhorse for XP and common drops: once the Mob Spawner XP Farm is running it keeps producing whether you are standing there or off mining elsewhere within simulation distance.
Does the Mob Spawner XP Farm work on its own once built?
Largely, yes — after setup the Mob Spawner XP Farm keeps producing XP and common drops 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 Mob Spawner XP Farm different from similar builds?
It is best understood through its focus on xp, mob and spawner. Those traits drive the material list and layout described above, and are what set this farm build apart from a generic XP and common drops build.
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