MOB FARM / GRINDER
A dark room spawner that spawns hostile mobs in dark platforms, flushes them with water into a central shaft, and drops them to lethal fall height. Produces XP and mob drops passively.
Materials List
What Mob Farm / Grinder costs in materials
The parts list for Mob Farm / Grinder works out to 136 crafting ingredients once you make everything yourself, led by 96 Oak Planks, 20 Iron Ingot and 16 Planks, with 1 other kind behind them.
You can read up on Hopper separately; those pages carry the delay and power figures this Mob Farm / Grinder depends on.
| Part of Mob Farm / Grinder | Needed per Mob Farm / Grinder | What one costs to craft |
|---|---|---|
 Hopper | 4 | 5 Iron Ingot, 1 Chest |
 Chest | 2 | 8 Planks |
 Trapdoor | 32 | 6 Oak Planks for 2 |
Everything a Mob Farm / Grinder adds up to
96 Oak Planks
20 Iron Ingot
16 Planks- 4 Chest
Mob Farm / Grinder costs are worked out from the crafting recipes in Java Edition 26.2.
Mob Farm / Grinder, in one place: what it is and what it does
A dark room spawner that spawns hostile mobs in dark platforms, flushes them with water into a central shaft, and drops them to lethal fall height. Produces XP and mob drops passively.
As a farm it automates a resource loop, detecting growth or spawns and harvesting them, so the materials accumulate while you are away. It sits at an intermediate level: nothing exotic, but the timing between parts has to be right for it to work smoothly.
Footprint: 20W x 20L x 30H minimum. The Mob Farm / Grinder has worked since Minecraft 1.0+ and it still works the same way in the current 26.2 release.
The Mob Farm / Grinder from the inside: what drives what
Dark spawning platforms let hostile mobs appear, open trapdoors at the edges read as solid to the mobs' pathfinding so they walk straight off, and water channels nudge them into a central shaft. A drop of 23 or more blocks brings them to one hit from death for easy XP and full drops.
Of the 6 materials in the list, these are the ones doing the actual work: building Blocks, water Bucket, hopper, chest, and trapdoor. Everything else is there to hold them in place and in line.
Because it is a farm, throughput depends on how often the resource grows or spawns, so leaving it loaded (within render or simulation distance) is what actually fills the chests.
Building the Mob Farm / Grinder, step by step
- 1Build at Y=200+ for maximum spawn rates (no caves to compete).
- 2Create 4 spawning platforms (at least 8x8 each) in a cross pattern.
- 3Place open trapdoors along the edges (mobs see them as solid, walk off).
- 4Add water channels on each platform that push mobs toward the center shaft.
- 5Build a central drop shaft (23+ blocks tall for lethal fall damage).
- 6At the bottom, place hoppers leading into chests to collect drops.
- 7Light up all surrounding areas within 128 blocks to maximize spawn rates.
- 8AFK at the collection point, mobs spawn, walk off edges, fall, and die.
Where the Mob Farm / Grinder earns its keep
- ▸As a farm it automates a resource loop, detecting growth or spawns and harvesting them, so the materials accumulate while you are away.
- ▸A intermediate build that asks for 200× building Blocks, 8× water Bucket, 4× hopper, and 2× chest along with the rest of the 6 material types on the list above.
- ▸Pair it with an automatic storage or sorting system so the harvested items file themselves away.
- ▸Run several copies side by side, most farm designs here are tileable, to multiply output.
Tips & common mistakes
- !Light every cave and surface within a 128-block sphere or competing spawns elsewhere will starve the farm's spawn rate.
- !Try all 8 steps in a flat creative world first. The Mob Farm / Grinder is forgiving as these builds go, but one wrong facing can still cost you the whole thing.
- !Remember a powered hopper is locked, not active, keep stray redstone away from the hopper lines unless you deliberately want to gate item flow.
Mob Farm / Grinder, frequently asked questions
How do you build a Mob Farm / Grinder in Minecraft?
Build at Y=200+ for maximum spawn rates (no caves to compete). Create 4 spawning platforms (at least 8x8 each) in a cross pattern. The full build takes 6 material types and fits in about 20W x 20L x 30H minimum.
What materials does a Mob Farm / Grinder need?
The main materials are 200× building Blocks, 8× water Bucket, 4× hopper, and 2× chest, plus the remaining structural and wiring blocks.
How hard is the Mob Farm / Grinder to build?
It sits at an intermediate level: nothing exotic, but the timing between parts has to be right for it to work smoothly. It is compatible with Minecraft 1.0+ and later.
How does the Mob Farm / Grinder actually work?
Dark spawning platforms let hostile mobs appear, open trapdoors at the edges read as solid to the mobs' pathfinding so they walk straight off, and water channels nudge them into a central shaft. A drop of 23 or more blocks brings them to one hit from death for easy XP and full drops.
How tall does the drop need to be in a mob farm?
A fall of 23 blocks or more leaves most common hostile mobs at half a heart, so a single punch finishes them while preserving full XP and drops. Shorter drops leave mobs too healthy; much taller drops simply kill them outright and skip the XP.
Builds that share parts with Mob Farm / Grinder
Where to go next from Mob Farm / Grinder: 5 contraption pages with a real connection to it.
