Description:
Duplication Spawner is a placeable block that duplicates stored items: it provides 9 input slots and every 60 seconds copies each input stack into a separate duplicated-output buffer, duplicating full stacks and supporting stacked items. Right-click to open its GUI to view inputs, output counts, and the timer, and use the buttons to insert your held stack, withdraw input stacks, or collect duplicated output; hoppers pointing into the top or sides insert into the inputs, while a hopper underneath (or the Collect Output button) only extracts duplicated output — input slots are protected from extraction. The spawner saves its contents and timer with the world, and breaking it drops both stored inputs and any pending duplicates.
Mod Wiki
Duplication Spawner
Quickstart
- Gather 4 Amethyst Shards, 4 Diamonds, and 1 Eye of Ender.
- Craft the Duplication Spawner at a Crafting Table:
- Place the block anywhere in your world.
- Hold any item stack you want to duplicate, then interact (right-click / tap) the block to open its GUI.
- Press "Insert held stack" to load the item into an input slot.
- Wait 60 seconds — the spawner duplicates every stored input stack automatically, playing a sound and particle effect when it fires.
- Interact again and press "Collect Output" to take your duplicated items.
Overview
The Duplication Spawner is a single craftable block that passively duplicates items placed inside it. Load up to 9 item stacks into its input slots, and every 60 seconds the block copies each full stack into a separate output buffer. The input stacks are never consumed — they stay in place and get duplicated again on the next cycle. Outputs accumulate until you collect them.
What It Adds
| Content | Type | Description |
|---|
| Duplication Spawner | Placeable Block | Duplicates stored item stacks every 60 seconds |
How To Use
Opening the GUI
Interact with the placed block (right-click on Java-style controls, or the interact button on touch/controller) to open the Duplication Spawner menu. The GUI displays:
- Input slots — items currently loaded for duplication (up to 9 stacks).
- Output count — how many duplicated items are waiting to be collected.
- Timer — seconds remaining until the next duplication cycle.
GUI Buttons
| Button | Effect |
|---|
| Insert held stack | Moves the item stack currently in your hand into an input slot. Stacks that do not fully fit leave the remainder in your hand. |
| Withdraw input stacks | Returns all input stacks to your inventory. |
| Collect Output | Transfers all duplicated output from the buffer into your inventory. If your inventory is full, uncollected items remain in the buffer. |
Hopper Automation
Hoppers can automate both loading and unloading:
- A hopper pointing into the top or any side of the Duplication Spawner inserts items into the input slots.
- A hopper placed underneath the block extracts only from the duplicated-output buffer — input slots are fully protected from hopper extraction.
Crafting And Obtaining
Craft the Duplication Spawner at a standard Crafting Table using Amethyst Shards, Diamonds, and an Eye of Ender:
The block takes about 5 seconds to mine by hand and has moderate explosion resistance, so it is not trivial to destroy accidentally.
Abilities And Mechanics
- 60-second cycle — every 60 seconds, each occupied input slot produces one duplicate of its stored stack and places it in the output buffer.
- Full-stack duplication — the entire input stack is copied; stacked items are fully supported.
- Input protection — hoppers and automation can never accidentally drain the input slots; only the GUI's Withdraw button removes inputs.
- Persistence — the block saves all input stacks, buffered output, and the current timer when the world is saved. Nothing is lost on reload.
- Break behavior — breaking the Duplication Spawner drops all stored input items and any pending duplicated output as item entities at the block's location.
- Self-insertion prevention — you cannot insert a Duplication Spawner into itself.
Progression And Strategy
- Early use: Start with a single item type you need in bulk (arrows, food, ingots) and let cycles accumulate while you do other tasks.
- Load all 9 slots: Each slot duplicates independently per cycle, so filling all 9 inputs maximises output per minute.
- Automate collection: Place a hopper underneath feeding into a chest to collect output hands-free, creating a fully passive farm.
- Protect your inputs: Because input slots cannot be extracted by hoppers, you never need to worry about an automation mishap draining your seed items.
- Costly but permanent: The Eye of Ender and Diamond cost makes this a mid-to-late game investment, but once built it runs indefinitely without fuel or ongoing maintenance.
This mod is licensed under the CreativeMode Mods License.
