Mod Requirements
- Works only with NeoForge version 20.4.72-beta and above
- Requires the Nucleus mod (version 3.1.1 or newer)
What is Modular Systems
This Minecraft modification introduces multi-block cuboid structures that acquire various properties depending on the materials used in their construction. The core concept of Modular Systems revolves around modularity and scalability.
How Multi-block Structures Function

Cuboid multi-block structures represent the fundamental feature of Modular Systems (previously known as Modular Furnaces). Unlike traditional multi-block systems, this modification allows players to use different material blocks when creating cuboids, directly impacting the operational speed and fuel efficiency of the completed structure. This enables systems to evolve alongside the player: as more valuable materials (like diamonds or redstone) are obtained, existing systems can be upgraded by replacing individual blocks within the construction.
Building a Cuboid

The image above displays a standard 3x3x3 cuboid, which represents the minimum size requirement. Players can create cuboids of any dimensions as long as the following conditions are satisfied:
- Top and bottom layers must be completely filled
- Central layers can contain voids beyond the outer ring of blocks
- Core block of the system is positioned within one of the central layers
Example of 5x5x5 Cuboid

Material Impact on Performance
Each block utilized in the cuboid's structure influences the final characteristics of the multi-block system. Every permitted block features speed, efficiency, and multiplicity parameters. These statistics are calculated by considering both the number of blocks and their individual properties.
Blocks identified by tags (such as forge:stone) are combined in collective calculations. For instance, 3 stone blocks and 2 andesite blocks would be treated as 5 blocks in the "forge:stone" category. If the speed modifier is -2 ticks, the total reduction would amount to -10 ticks (-2 × 5 blocks).
Key Performance Metrics
- Speed: How many ticks are reduced from processing time (for furnaces, this refers to smelting duration)
- Efficiency: How many ticks are added to fuel burn time
- Multiplicity: How many items are processed per operation
Each metric maintains minimum and maximum values, displayed in JEI as "MIN ↔ MAX".

Depending on the type of multi-block system, these characteristics may function differently — for example, in a generator, the speed metric might determine FE/tick through value inversion and coefficient multiplication. Such specific adjustments will be documented for each core block type.

Fuel Systems
To operate a cuboid structure, at least one fuel source is necessary, which can be placed anywhere within the construction. Each fuel source can be configured with operational priority: when the multi-block system requires fuel, sources with higher priority will be utilized first.
