In Minecraft, carpets are often used for decorating builds, but they also have surprising utility in redstone and fuel production. While crafting carpets from wool is simple, players looking for automation and efficiency sometimes turn to a method known as a carpet duper. This redstone contraption exploits game mechanics to duplicate carpets, providing an infinite source of fuel or decoration. If you want to learn how to make a carpet duper, understanding the mechanics and components involved is essential. This guide covers everything you need to know to build a functional and compact carpet duper that works in supported Minecraft versions.
Understanding Carpet Dupers
A carpet duper is a redstone device that uses specific interactions in the game to duplicate carpet blocks. This exploit only works in certain versions of Minecraft (typically Java Edition), and is primarily used for automation, especially when building automatic smelters that require continuous fuel. Since carpets can be used as fuel in furnaces, duplicating them allows you to generate endless fuel without farming or mining other resources.
What Versions Support Carpet Duplication?
- Primarily works in Minecraft Java Edition 1.12 through 1.19
- May not work in Minecraft Bedrock Edition
- Often patched in certain updates check current version
Always test your build in a creative world before using it in survival to make sure carpet duplication works in your version.
Materials Needed
To make a simple and reliable carpet duper, you’ll need the following items:
- 1 Observer
- 1 Sticky Piston
- 1 Slime Block
- 1 Coral Fan (any type, must be dead)
- 1 Carpet (any color)
- 1 Solid Block (any block that redstone can interact with)
- Optional: Redstone Block or Lever (to activate the piston)
Most of these components are easy to gather by mid-game. The dead coral fan may require access to a warm ocean biome, where coral grows naturally. To get a dead coral fan, break it without water nearby or place it out of water until it dies.
How Carpet Duplication Works
The principle behind carpet duplication involves quickly pushing a carpet using a slime block with an attached dead coral fan. This combination forces the game to spawn a duplicate carpet block when the piston activates. While this is technically an exploit, it functions due to the way the game handles block updates and tile entity behavior. Mojang has patched some duplication glitches in newer updates, but some forms of this exploit continue to work depending on the setup.
Step-by-Step Guide: How to Make a Carpet Duper
Follow these instructions to build a simple carpet duplicator that runs when triggered manually or by redstone:
Step 1: Place the Piston
Begin by placing the sticky piston facing horizontally in the direction you want the slime block to move. Ensure there’s enough space in front of the piston for movement.
Step 2: Add the Slime Block
Attach a slime block directly to the front face of the sticky piston. This block will push and pull other components, including the carpet and coral fan.
Step 3: Place the Observer
Place an observer facing into the piston or a nearby block so that it detects block updates. The observer should send a redstone signal to activate the piston. You can also place a redstone block near the piston to power it manually or use a lever for simple control.
Step 4: Attach the Coral Fan
On the side or top of the slime block, place a dead coral fan. This step is critical the coral fan needs to be in an invalid block state, which is what triggers the duplication.
Step 5: Add the Carpet
Place a carpet on top of the slime block or next to the coral fan (depending on the build orientation). When the piston activates, the movement of the slime block and coral fan causes the game to duplicate the carpet.
Step 6: Activate the Duper
Power the piston using the observer or lever setup. Each time the piston extends and retracts, it should create a duplicated carpet item that drops in front of the contraption. You can then collect these carpets using hoppers for automation.
Collecting the Duplicated Carpets
To make the most of your carpet duper, set up a collection system to automatically gather and store the output.
Simple Collection System
- Place a hopper beneath the spot where the carpet drops
- Connect the hopper to a chest or minecart with chest for storage
- Use multiple hoppers if the duper produces carpets rapidly
This setup allows you to scale the duper by combining it with other redstone machines, such as automatic smelters or fuel sorters.
Best Uses for Duplicated Carpet
Once you’ve made a working carpet duper, you can use the output in several ways, both practical and creative.
Fuel for Furnaces
- Carpet burns for 0.335 items per unit in a furnace
- Not very efficient per unit, but perfect for infinite fuel setups
- Best when used in bulk with automatic furnaces or super smelters
Decorative Uses
- Use duplicated carpets to decorate your builds
- Match colors for themed designs or carpeted paths
- Useful in survival mode where wool may be scarce
With unlimited access to carpets, you no longer need to rely on wool farms or sheep breeding for interior decoration or large-scale design projects.
Troubleshooting Carpet Duplicators
If your carpet duper doesn’t work as expected, check these common issues:
- Piston not activating: Ensure redstone signal is reaching the piston
- Carpet not duplicating: Make sure coral fan is dead and placed correctly
- Carpet vanishes: Verify the version of Minecraft supports the exploit
- Slime block not moving: Check for immovable blocks nearby (like obsidian)
Experimenting in Creative Mode helps you quickly identify what’s going wrong before committing to the build in Survival.
Ethical Considerations and Game Updates
Carpet duplication is considered an exploit, and its use may vary depending on your server’s rules or personal playstyle. While some players embrace it for automation and convenience, others prefer to avoid glitches and play in a purely vanilla style. Additionally, Mojang occasionally patches duplication mechanics, so be aware that your duper may stop working after future updates.
If you’re playing on a multiplayer server, always check the rules before using a carpet duper. Many survival servers disallow duping of any kind to maintain a fair economy and challenge.
Scaling Up Your Duper
If you want to generate more carpet faster, you can build multiple dupers side by side and synchronize them with a central redstone clock. You’ll need more space and more collection hoppers, but the concept remains the same.
Benefits of Scaling
- Faster fuel production for large smelting systems
- Higher carpet output for decoration or trading (if enabled)
- More reliable supply without waiting
Just remember that large redstone machines can cause lag, especially in older systems or low-end devices. Always test scaled builds before leaving them running continuously.
Learning how to make a carpet duper in Minecraft opens the door to efficient fuel automation and endless decorative possibilities. By combining basic redstone components with specific block placements like dead coral fans and slime mechanics, players can exploit the game’s update system to create a steady supply of duplicated carpet. Whether you use it for fueling furnaces or designing sprawling floor patterns, a carpet duper is a clever and functional tool that’s easy to build and rewarding to maintain. Just be mindful of game version compatibility and server rules before integrating it into your world.
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