Getting Started with Mob Grinding Utils – Mob Grinding Utils Wiki (1.21.1)

Mob Grinding Utils is a kit of blocks for mob farms. A farm built with it has four parts: something that spawns mobs, something that moves them, something that kills them and something that collects the drops and experience. This page goes through them in that order and follows Mob Grinding Utils 1.1.10 for Minecraft 1.21.1.

1. Spawning mobs: Dreadful and Delightful Dirt

The quickest way to more mobs is special dirt. You get it from eggs laid by chickens that ate special feed. GM Chicken Feed Cursed gives a Rotten Egg, Nutritious Chicken Feed gives a Golden Egg. Use the egg on grass, dirt, mycelium or farmland to turn a 5×5 area into dirt that spawns mobs.

4 × Bucket of Experience or Fluid XP Bucket + Spider Eye + Rotten Flesh + any Beetroot Seeds (#c:seeds) + any Bone + any Gunpowder → GM Chicken Feed Cursed

4 × Bucket of Experience or Fluid XP Bucket + Carrot + Potato + any Beetroot Seeds (#c:seeds) + Beetroot + Wheat → Nutritious Chicken Feed

Note Both feeds need four buckets of experience fluid. In the recipe any bucket of experience works, for example the

Fluid XP Bucket — see step 4 for where the experience comes from.

Block	Spawns	Stops when	Other rules (tooltips)
Dreadful Dirt	Hostile mobs, rapidly, in the dark	Light level is 5 or higher	Catches fire in daylight if it can see the sky
Delightful Dirt	Passive creatures, rapidly, in the light	Light level is below 10	Gets a snow cap at night if it can see the sky; does not work in ocean biomes

Both drop plain dirt when broken without Silk Touch.

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2. Moving mobs

The Mob Fan pushes mobs in the direction it faces. Its upgrades widen and lengthen the air stream: Width and Height Upgrades add 1 each (up to 3), Distance Upgrades add 1 (up to 10). The area can be shown from the fan's screen.

4 × Stone Slab + 4 × any Iron Ingot + any Block of Redstone → Mob Fan

4 × any Iron Ingot + 3 × any Feather → Mob Fan Width Upgrade

4 × any Iron Ingot + 3 × any Feather → Mob Fan Height Upgrade

4 × any Feather + 4 × any Iron Ingot + any Redstone Dust → Mob Fan Distance Upgrade

The Entity Conveyor carries mobs and items along a flat line, and mobs can spawn on it; one craft gives 6. The Ender Inhibitor Active stops entities within 8 blocks from teleporting — it attaches to any side of a solid block and is switched on and off with a right-click.

2 × any Slimeball + 4 × any Iron Ingot + any Redstone Dust → 6 × Entity Conveyor

any Redstone Dust + 2 × any Iron Ingot + Eye of Ender + any Glowstone Dust → Ender Inhibitor Active

3. Killing mobs: spikes or the Mob Masher

Block	Player kill?	Notes (tooltips)
Iron Spikes	No	Simple spikes that also drop the mob's experience.
Mob Masher	Yes	Modular mob grinder; takes Mob Masher Upgrades.

Because the Mob Masher's kills count as player kills, it is the block to use when you want everything a player kill drops. The Iron Spikes go into its recipe, so craft spikes first.

3 × Iron Sword + any Block of Iron → Iron Spikes

2 × Iron Sword + 3 × any Diamond + 2 × Iron Spikes + any Block of Redstone + any Block of Iron → Mob Masher

Each Mob Masher Upgrade adds one level of its enchantment. In the default settings each kind can go up to 10.

Upgrade	Adds	Key ingredient
Mob Masher Upgrade Sharpness	Sharpness	4 iron swords
Mob Masher Upgrade Looting	Looting	4 blue dye
Mob Masher Upgrade Fire	Fire Aspect	4 flint and steel
Mob Masher Upgrade Smite	Smite	4 rotten flesh
Mob Masher Upgrade Arthropods	Bane of Arthropods	4 spider eyes
Mob Masher Upgrade Beheading	Beheading	2 iron and 2 golden helmets

All of them also take four gold nuggets and one redstone. With Beheading the Masher can drop these heads:

—

→ Creeper Head

—

→ Dragon Head

—

→ Skeleton Skull

—

→ Wither Skeleton Skull

—

→ Zombie Head

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4. Collecting drops and experience

The Absorption Hopper pulls in items and experience orbs in a 7×7×7 area; each Absorption Radius Upgrade adds 1 to the radius, up to 6. The area can be shown and moved from its screen. Every side can be set to push out: items go into inventories and the experience — stored as Fluid XP — goes into tanks.

Eye of Ender + 3 × any Obsidian (#c:obsidians) + Hopper → Absorption Hopper

3 × any Ender Pearl + any Redstone Dust + 2 × any Obsidian (#c:obsidians) + Hopper → Absorption Radius Upgrade

4 × any Iron Ingot + 5 × any Glass (#c:glass_blocks) → Singularity Tank

4 × any Iron Ingot + 4 × Singularity Tank → Jumbo Tank

Singularity Tank — stores a fluid and keeps it when broken.
Jumbo Tank — a larger tank that holds 1,024 buckets of any liquid.
XP Tap — attached to the side of a tank, it turns Fluid XP back into experience orbs.
XP Solidifier — turns Fluid XP into edible XP jellies with a mould; it can export sideways and XP Speed Upgrades make it faster.

any Obsidian (#c:obsidians) + 3 × any Iron Ingot → XP Tap

Piston + 2 × Entity Conveyor + Hopper + Singularity Tank → XP Solidifier

8 × any Gold Nugget + Bucket of Experience or Fluid XP Bucket → XP Mould Blank

XP Mould Blank → XP Mould Jelly Baby

Fluid Xp1,000 mB

Mold

Fluid Xp 1,000 mB + XP Mould Jelly Baby → XP Jelly Baby

The XP Mould Blank (eight gold nuggets around a bucket of experience) turns into the XP Mould Jelly Baby in the crafting grid and back again. Nine XP Jelly Babies make a bouncy Solid XP block.

5. The Entity Spawner

The Entity Spawner spawns mobs in a 3×3×1 area. It needs a spawn egg in its top slot and burns XP Jelly Babies as fuel. Width and Height Upgrades add 1 each (up to 5); XP Speed Upgrades make it faster. Its recipe needs two Solid XP blocks.

3 × Eye of Ender + 2 × Solid XP + any Block of Redstone + 2 × any Block of Iron + Piston → Entity Spawner

6 × Egg + 2 × Blaze Powder + Bucket of Experience or Fluid XP Bucket → Entity Spawner Width Upgrade

6 × Egg + 2 × Blaze Powder + Bucket of Experience or Fluid XP Bucket → Entity Spawner Height Upgrade

4 × Sugar + 2 × any Redstone Dust + 2 × Blaze Powder + Bucket of Experience or Fluid XP Bucket → XP Speed Upgrade

Craft a Mob Swab and use it on the mob you want. It becomes a Mob Swab Used carrying that mob's DNA. The Wither and the Ender Dragon cannot be swabbed.
Craft the used swab with seeds and a bucket of experience fluid into GM Chicken Feed.
Feed it to a chicken. The tooltip shows which mob the feed contains and warns that it is single use for the chicken.
Put a spawn egg of the mob into the Entity Spawner's top slot and fuel it with XP Jelly Babies.

any Beetroot Seeds (#c:seeds) + Mob Swab Used + Bucket of Experience or Fluid XP Bucket → GM Chicken Feed

6. Walls, glass and quiet bosses

Tinted Glass keeps light out of a dark farm while you can still look in, and it stands up to Withers. The mod puts all of its blocks on the vanilla wither-immune tag — the fan, Mob Masher, spikes, hopper, tanks, conveyor and both dirts included. For boss farms, the Wither Boss Death Muffler (8 blocks) and the Ender Dragon Death Muffler (32 blocks) stop the death sounds, and a right-click on them hides the boss bar.

5 × any Coal (#minecraft:coals) + 4 × any Glass (#c:glass_blocks) → 4 × Tinted Glass

8 × any White Wool (#minecraft:wool) + Wither Skeleton Skull → Wither Boss Death Muffler

8 × any White Wool (#minecraft:wool) + Dragon Egg → Ender Dragon Death Muffler

Mob MasherBeheading · 5 recipes

Iron SpikesBlock

Mob FanBlock

Absorption HopperBlock

XP SolidifierXP Solidifier · 1 recipe

Entity SpawnerBlock

Recipes, names and numbers are read from the mod files of Mob Grinding Utils 1.1.10+mc1.21.1 for Minecraft 1.21.1 (NeoForge). Not affiliated with the mod authors, Mojang or Microsoft.