Merged Furnaces
Fuse several furnaces into one and turn it into a smelting beast.
Fabric Minecraft 26.1.2 Java 21+ Client + Server
Overview
A Fabric mod for Minecraft 26.1.2 that adds a single block, the Merged Furnace, which evolves through 10 levels. Every level unlocks more slots, more speed, and ultimately better fuel efficiency.
Parallel smelting
Up to 5 items cook at the same time, each with its own independent progress arrow.
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Stacked fuel
Up to 5 chained fuel slots that burn one after another. Load a stack in each and forget about refueling for hours.
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Level preserved
Break it and place it again - keeps its exact level. No upgrade progress is ever lost.
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Visual identity
Each level shifts the stripe color on the block and the item following a "heating up" progression.
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Crafting
The base Merged Furnace is crafted with 4 vanilla furnaces in a 2×2 pattern on the crafting table. It starts at level 1.
How to level up
With the Merged Furnace placed in the world, hold a vanilla furnace, blast furnace or smoker in your hand and right-click the block. Each upgrade:
- Consumes the furnace from your hand (in survival).
- Plays the anvil sound as upgrade feedback.
- Bumps the level by 1 (up to 10).
- Changes the stripe color of the block instantly.
- Sends a chat message confirming the new level.
Level progression
Upgrades come in two phases. Levels 1-5 multiply speed and add fuel slots. Levels 6-9 add input + output pairs for parallel cooking. Level 10 caps it with a final speed + fuel efficiency bonus.
| Level |
Color |
Input |
Fuel |
Output |
Speed |
Efficiency |
| 1 |
Blue |
1 |
1 |
1 |
1× |
1× |
| 2 |
Cyan |
1 |
2 |
1 |
2× |
1× |
| 3 |
Green |
1 |
3 |
1 |
3× |
1× |
| 4 |
Orange |
1 |
4 |
1 |
4× |
1× |
| 5 |
Red |
1 |
5 |
1 |
5× |
1× |
| 6 |
White hot |
2 |
5 |
2 |
5× |
1× |
| 7 |
Light cyan |
3 |
5 |
3 |
5× |
1× |
| 8 |
Magenta |
4 |
5 |
4 |
5× |
1× |
| 9 |
Violet |
5 |
5 |
5 |
5× |
1× |
| 10 |
Gold |
5 |
5 |
5 |
6× |
+25% |
The interface
The GUI is laid out vertically like a real chimney: fuel burns at the bottom, the item cooks in the middle, and the result rises to the top slot. Slots locked by the current level show a red padlock. Each input has its own progress arrow that fills from bottom to top.
- Top row: 5 result slots (output).
- Vertical arrows: per-slot cook progress.
- Middle row: 5 input slots (items being cooked).
- Bottom row: 5 fuel slots. The active slot shows an animated flame on top.
- Top-right corner: "Lv. X / 10" indicator.
Under the hood
Parallel cooking
From level 6 onwards, every input slot processes its smelting recipe independently. Each slot has its own timer, so you can run 5 different recipes at once (iron + gold + food + glass + sand, for example).
Fuel drains proportionally to the number of active items: if 3 items are cooking, burn time decreases by 3 units per tick.
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Level 10 efficiency bonus
Level 10 introduces two subtle but stacking benefits:
- Effective fuel drain per tick is
max(1, N-1), where N is items cooking. Cooking 5 items costs you what 4 would.
- Every fuel piece ignites with a +25% duration bonus.
- Base smelting time drops to ~33 ticks (20% faster than the level 5 cap).
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Level preservation on break
The block is mined with any pickaxe (registered as a pickaxe tool block) at the same speed as a vanilla furnace. On break:
- Drops the full inventory contents (inputs, fuels and outputs).
- Drops a Merged Furnace item with its level saved. The item icon already shows the matching stripe color.
- When placed back, the block immediately appears at its original level - no level 1 flash - because the component is read at placement time.
Technical details
Block & BlockEntity
Block state with facing, lit and furnace_level (1-10) properties. The BlockEntity keeps its level in sync with the state through the server tick.
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Custom data component
merged_furnaces:furnace_level (Integer): read by both the item model (via minecraft:select) and getStateForPlacement when placing the block back.
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block_entity_data
Same vanilla mechanism shulker boxes use: the dropped item carries a FurnaceLevel tag that is applied to the newly created BlockEntity during placement.
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Procedural GUI
The entire panel is drawn with primitives (fill / text on GuiGraphicsExtractor), no PNG background. Flame and arrows rendered pixel by pixel.
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Installation
- Make sure you have Fabric Loader 0.19.0 or newer for Minecraft 26.1.2.
- Install Fabric API 0.149.1+26.1.2 (or a newer compatible release).
- Drop
merged_furnaces-1.0.0.jar into the mods/ folder on both the client and the server.
- Restart and craft a Merged Furnace with the 2×2 recipe.
The mod is client + server: both sides need the JAR. The server handles block logic and smelting; the client renders the GUI, textures and the item model.
Merged Furnaces · vicxelcode · Built for Minecraft with Fabric
