A Minecraft unlimited fuel furnace carpet duper super smelter setup is considered OP (overpowered) because it completely removes the biggest survival limitation in smelting: fuel scarcity.

In normal Minecraft, players constantly need coal, charcoal, lava buckets, or bamboo farms to keep furnaces running. But all of those have limits, setup time, or resource cost. A carpet duper breaks that balance by generating Minecraft Unlimited Fuel Furnace carpet from a duplication glitch, which can then be used as fuel or converted into string-based systems.

Once connected to a super smelter, the system becomes basically self-sustaining:

• The carpet duper continuously produces carpets without mining or farming.
• Hoppers feed those carpets directly into furnaces as fuel.
• The furnaces keep smelting items nonstop as long as there’s input.
• You can scale it to dozens or even hundreds of furnaces for massive throughput.

This is why it’s considered OP: it turns a normally resource-limited process into a fully automatic infinite fuel factory, letting you smelt huge amounts of ores, stone, food, or glass without ever worrying about running out of fuel again.

For players, this effectively becomes the best “infinite fuel source” for super smelters, because it:

• Requires no manual farming once built
• Keeps furnaces permanently running
• Supports large industrial-scale bases
• Removes dependency on coal, bamboo, or lava farms

In short, a carpet duper super smelter turns Minecraft’s smelting system into a factory that never stops, which is why it’s seen as one of the most OP redstone automation tricks in the game.

🧱🔧 Materials Required for Minecraft Unlimited Fuel Furnace Carpet Duper Super Smelter 🔥⚙️

• 🧱 2 Building Blocks                                (Any solid blocks for structure/base)
• 🟩 4 Slime Blocks                                        (For movement and duper mechanism)
• 🧲 1 Sticky Piston                                        (Core pushing/pulling component)
• 🪸 1 Coral Fan (Coral Horn)                  (used in duper trigger setup)
• 🔴 10 Redstone Dust                                 (For wiring the circuit)
• 🔘 1 Lever                                                    (Manual ON/OFF control)
• 🔁 4 Repeaters                                          (For timing and signal delay control)
• 🧵 3 Carpets                                                 (Key item for duplication fuel system)

Step 1 — Place the Base Block

Place 1 solid blocks on the ground and place a Sticky Piston like this:

Step 2— Place the Slime Blocks

Attach 4 slime blocks diagonally upward from the piston face.

Step 3 — Add the Horn Coral

Place Horn Coral on the bottom block of the slime blocks.

Step 4 — Add the Carpets

Place 3 carpets on the front side of the slime blocks.

Step 5 — Build the Redstone Clock

Behind the Sticky piston:

1. Place redstone dust
2. Add 4 repeaters in a loop shape

Step 6 — Build the Redstone Wiring

Connect them using redstone dust.

Place a lever connected to the redstone clock.

Flick it ON/Off quickley to activate the machine.

The slime arm should start moving rapidly.

[R] -> [R]
^ |         | v
[R] <- [R]

Step 7 — Collect the Carpets

When the machine runs:

• Carpets duplicate continuously
• Broken carpets fall on the ground
• Add hoppers + chests underneath if you want auto collection

How It Works

The redstone clock creates rapid piston updates while the slime structure moves.

Because carpets are movable non-full blocks, the update timing causes duplication glitches.

This works on:

• Java Edition & Bedrock (V26+)
• Some Paper/Spigot servers if duplication glitches are enabled

Tips

• Use different carpet colors for decoration
• Build over hoppers for automatic storage
• Increase slime length for more carpets
• Chunk loaders help keep it running

Common Problems

Machine Not Moving

• Repeater facing wrong direction
• Piston not sticky
• Repeaters not powered correctly

No Carpet Duping

• Server patched the glitch
• Wrong Minecraft version
• Carpet placement incorrect

Machine Breaks

• Too many attached blocks
• Slime touching nearby blocks