How to Build a Chunk Loader in Minecraft

Why Chunk Loaders Matter

Running a productive mob farm in Minecraft is tricky business, and the moment you walk away your hard work tends to grind to a halt. Whether your project is a skeleton XP farm, an enderman grinder, or a quiet potato field that needs to keep growing, you can keep those regions ticking even when no players are around. The trick is a chunk loader, a contraption that forces the game to process specific chunks regardless of player distance. It works in vanilla, in modded worlds, and in singleplayer, and once you have one running your farms become a steady source of drops and crops.

The catch is that setting one up takes a bit of redstone patience. Designs range from simple to maze-like, so this guide walks through a reliable build, the mod and plugin shortcuts available, and the most common reasons a finished loader refuses to cooperate.

What a Chunk Loader Actually Does

A chunk loader keeps a small chunk area permanently active, which means entities inside it continue to spawn, move, and despawn the way they would with a player nearby. Only a 3x3 chunk zone around the loader processes entities, so positioning matters. Toggle Minecraft's debug overlay with F3 + G to outline chunk boundaries before you start placing blocks. That one shortcut saves a lot of demolition later.

The classic vanilla approach borrows from Nether portal mechanics. By bouncing an item back and forth between two linked portals across dimensions, the game is forced to keep both regions loaded. It is a bit of a workaround, but it is well documented and reliable.

What You Need to Build One

Gather the following before you start:

• 10 Obsidian
• 14 building blocks of your choice
• 2 Comparators
• 2 Redstone Dust
• 4 Droppers
• 2 Observers
• 2 Hoppers
• 1 Flint and Steel
• 2 Levers

If collecting all of that the honest way sounds painful, enable cheats or grant yourself operator status on the server so the materials drop into your inventory in seconds.

Step by Step Build

Once your supplies are sorted, work through the sequence below.

1. Pick a spot for the first half of the loader and dig out two blocks from the ground.

1. Build the obsidian portal frame. Then place one Dropper facing upward and a second Dropper aimed at the portal.

1. Attach a Hopper to the first Dropper and place a Comparator behind that Dropper.
2. Place a block behind the Comparator and a piece of Redstone Dust on top of it.
3. Position the Observer so it watches the Redstone Dust. That is what keeps the loop firing.

1. Cover the Hopper with building blocks so items land where they should.

1. Light the portal, step through to the Nether, and confirm the landing spot is where you want the second machine to sit.
2. Build a mirror copy of the same setup on the Nether side. If you want a kill switch, drop a lever next to the redstone so you can pause the loop.

1. With both sides built, an item should now bounce between the droppers across dimensions and keep both chunks loaded.

Mods and Plugins if You Want the Easy Route

Not everyone wants to crouch in front of a portal aligning observers. If redstone is not your idea of fun, mods and plugins handle the job with a single placeable block or a chat command. The Chunk Loaders mod on CurseForge is the popular pick, supports both Forge and Fabric, and covers plenty of game versions. On the plugin side, ChunkLoader on Spigot ships with commands and a small menu interface that takes about a minute to learn. Either option is friendlier than redstone if you just want results.

Troubleshooting

Plenty of fresh builds refuse to load chunks on the first try. The most common cause is placing a portal too close to a chunk boundary. The entire setup needs to sit in the middle of the chunk so the 3x3 activation area covers both sides. Pull up the F3 + G overlay in both the Overworld and the Nether, then move the portal if it straddles a line.

If the alignment is fine, recheck the observer, the droppers, the comparator, and the redstone path. A second usual suspect is the item never making it back into the loop. That typically means a hopper and dropper need to swap positions so the item lands inside the pickup zone. The item has to be in a permanent loop, otherwise the chunk only loads for a couple of ticks at a time.

Once your loaders are running, keep an eye on the server. Forcing too many regions to stay active drains performance fast, and you will feel it as TPS drops. Keep the count modest, two or three loaders is plenty for most worlds. If lag does start, the cheapest fix is shutting down some of the loaders. Reviewing the modded or non-modded optimization tutorials is also worth the time when load creeps up.

When mods or plugins refuse to work, the usual culprit is a version mismatch. Forge 1.20.1 will only run mods compiled for 1.20.1, and plugins need a Spigot or Paper jar on the correct game version. Set the right jar from the Game File area of your HolyHosting control panel, then make sure cheats are on or that your account has operator rights so the addon commands respond. If you are stuck, the HolyHosting Support Team can take a look at the configuration.

Wrapping Up

Chunk loaders are one of the most useful contraptions in Minecraft, and also one of the easiest to overuse. A small number across your farms keeps drops and crops flowing without players present, while a dozen of them will make your server gasp. Stick to a couple, pick the vanilla portal build, a mod, or a plugin, and your farms will keep working long after you log off.