Item Duplicator

Quickstart

1. Craft an Item Duplicator and place it down.
2. Load fuel — place copper or gold materials (nuggets, ingots, raw ore, or blocks) directly into the duplicator's inventory, or feed them in via a hopper from above.
3. Set a target item — right-click the block to open the single-slot GUI and place the item you want duplicated. The screen lights up and shows the item's icon.
4. The machine runs a 100-tick cycle and produces one duplicate. Place a hopper below the duplicator to collect output automatically.
5. For fully hands-free operation, connect a hopper above (feeding target items and fuel) and one below (collecting output) to enable Mass Production Mode.

All recipes are unlocked automatically when you join a world.

Overview

Item Duplicator is a Java Edition 1.20.1 Fabric mod built around duplicating any item when you supply enough copper and gold fuel. A full suite of supporting automation — fuel generators, a compressor chain, three grabber types, a storage cube, a shredder, and infinite-resource blocks — gives you everything needed to go from early-game gathering to legendary item duplication.

What It Adds

Crafting And Obtaining

Item Duplicator

Fuel Compressor

Shredder

Contained Curse of Midas

Paradox Contained Curse of Midas

Block Grabber

Mob Grabber

Fluid Grabber

Item Grabber

Storage Cube

Paradox Copper Nugget → Copper Ingot (9-to-1)

Copper Ingot → Paradox Copper Nuggets (1-to-9)

Abilities And Mechanics

Item Duplicator

The duplicator runs in 100-tick cycles. Each cycle costs Copper Fuel Units (CFU) and Gold Fuel Units (GFU) based on item rarity:

Items not on any explicit list default to Tier 1.

Fuel cross-substitution rules:

• Tiers 3 & 4: if CFU is short, up to half the copper deficit may be covered by gold at 1 GFU per 2 CFU of deficit.
• Tier 5: both CFU and GFU must be present simultaneously — no substitution allowed.

Fuel breakdown cascade — materials are fractured progressively as fuel is demanded:

• copper_nugget / paradox_copper_nugget → 1 CFU each
• raw_copper → 4 CFU
• copper_ingot → 9 CFU (split into 9 nugget-equivalents on demand)
• copper_block → 81 CFU (split into ingots, then into nuggets)
• Same cascade for gold → GFU; raw_gold → 4 GFU

Only what is needed for the current cycle is consumed. Partial breakdowns persist between cycles — no wasted fuel.

Mid-cycle fuel loss: if fuel runs out while a cycle is running, DuplicationProgress freezes. When fuel is restored the cycle resumes from exactly where it stopped — no progress is lost.

Redstone acceleration: surrounding the duplicator with Redstone blocks speeds up the duplication rate. Up to 8 adjacent Redstone blocks are recognised, each adding speed. This is configurable.

Mass Production Mode activates automatically when both an input hopper (above) and output hopper (below) are connected. After each cycle the machine immediately pulls the next non-fuel item from the top hopper and begins a new cycle without player input.

Manual input GUI: when no input hopper is connected above, right-click the duplicator to open a single-slot GUI. Place the item you want duplicated there. The item is stored as the target; the slot retains the item until you manually remove it. There is no fuel slot in the GUI — fuel is always loaded via inventory or top hopper.

On cycle completion: a bell sound plays and a burst of gold and copper particles erupts from the block.

Fuel Compressor

Automatically compresses copper and gold materials up through their tiers:

• 9 copper nuggets (or Paradox Copper Nuggets) → 1 copper ingot
• 9 copper ingots → 1 copper block
• 9 gold nuggets → 1 gold ingot
• 9 gold ingots → 1 gold block

Paradox Copper Nuggets are treated as copper throughout — they compress into copper ingots, not gold.

Hopper connections:

• Top / sides → feed in nuggets or ingots
• Bottom → extract ingot and block output

Adjacent Redstone blocks increase compression operations per tick for faster throughput. Chain two compressors with hoppers — the first converts nuggets to ingots, the second converts ingots to blocks — for a fully automated compression line.

Shredder

Accepts two inputs via hoppers:

• Top hopper → any trash/junk items to be destroyed
• Side hopper → glass bottles

Consumes one trash item and one glass bottle every 10 ticks to produce one Bottle o' Enchanting. Connect a bottom hopper to collect output automatically.

Contained Curse of Midas

Place and connect hoppers to any side. Continuously outputs gold nuggets into connected hoppers indefinitely — a passive infinite gold supply for fuel or other uses.

Paradox Contained Curse of Midas

Identical to the Contained Curse of Midas but outputs Paradox Copper Nuggets. These nuggets:

• Count as 1 CFU each in the Item Duplicator
• Are accepted by the Fuel Compressor and compress into standard copper ingots
• Can be crafted 9-to-1 into standard copper ingots at a crafting table

Block Grabber

• Right-click any block in the world to remove it and receive it as a Captured Block item.
• Works on normally unobtainable blocks (End Portal frames, barrier blocks, etc.).
• 256 durability; loses 1 per successful grab.
• Accepts Unbreaking and Mending enchantments only; repaired with iron ingots at an anvil.
• A short cooldown (up to 10 ticks) applies between grabs.
• Attempting to grab a denied block plays a metallic hit sound with no durability loss and a brief recoil animation.

Mob Grabber

• Right-click a mob to capture it as a Captured Mob item (equivalent to a spawn egg).
• Sneak + Right-click to preserve the mob's current variation (colour, name, equipment, etc.).
• Mobs that have no standard spawn egg get a custom captured equivalent.
• Right-click the captured mob item on the ground to release it.

Fluid Grabber

• Right-click a fluid source block to capture it as a Captured Fluid item.
• Works on any fluid including those with no standard bucket.
• Right-click the captured fluid item to place the fluid back in the world.

Item Grabber

• Right-click a chest, any storage block, a mob, or a player to siphon all items they are carrying into a Storage Cube.
• A short cooldown applies between uses.
• Durability decrements on each successful grab.

Storage Cube

• Portable 54-slot (9×6) container — the capacity of a double chest.
• Fireproof — will not burn in lava or fire.
• Right-click to open its inventory whether held as an item or placed as a block.
• Fully preserves all contents when broken and picked up.
• Displays an enchantment glint when it contains items.
• Requires no special tool to break when placed.
• If dropped on the ground for 3 minutes, it automatically teleports back to the player who last held or mined it.

Progression And Strategy

1. Early game — grab what you need: Craft a Block Grabber first. Collect rare or unobtainable blocks from the world without needing Silk Touch or specific drops.

2. Establish infinite fuel: Craft a Contained Curse of Midas (8 gold blocks + nether star) for infinite gold nuggets, or a Paradox Contained Curse of Midas (8 copper blocks + nether star) for infinite Paradox Copper Nuggets. Pipe nugget output into Fuel Compressors.

3. Build a compression chain: Place two Fuel Compressors connected by hoppers — the first converts nuggets to ingots, the second converts ingots to blocks. Surround compressors with Redstone blocks to maximise throughput. This gives you dense fuel reserves for high-tier duplication.

4. Start duplicating: Place an Item Duplicator, load fuel into its inventory (or via a top hopper), right-click to set a target item, and place a hopper below to collect output. For continuous hands-free operation, use a top hopper for items and fuel and a bottom hopper for collection — this activates Mass Production Mode.

5. Accelerate: Place up to 8 Redstone blocks adjacent to the duplicator to speed up its cycle. Run multiple duplicators in parallel for different items simultaneously. Use the Item Grabber and Storage Cube to move large quantities of loot between machines quickly.

6. Legendary tier: Duplicating Tier 5 items (elytra, beacon, totem of undying, dragon egg, etc.) demands very large simultaneous reserves of both CFU and GFU — no substitution is allowed. Build fully compressed fuel stockpiles from both Midas farm types before attempting these items.