Multiblocks are structures composed of multiple blocks which combine to form a single unified factory building. They contain a single controller, with the rest of the structure being filled with invisible filler blocks. Some examples of multiblocks include Miners, Biomass Burners, and Power Poles

When building a multiblock, its placement will be invalidated if any block position within its bounds is occupied by another block or entity. This should be taken into account when building structures such as Miners, where the max-extent of the building's bounds is drastically different than its visual model.

If any part of a multiblock is broken (i.e. by a creative mode player), the whole structure will tear down and remove every associated block.

Controller & Filler Blocks

Each multiblock has one controller block entity which is responsible for factory simulation, interaction, and rendering of the building. The controller is often found at one of the building's ports, if it has one. Otherwise, the controller will often be at the base of the building in cases like Power Poles.

The remaining blocks in a multiblock structure are invisible filler blocks. These filler blocks fill out a rough shape which approximates the building's model to give the building collision and interaction. Interacting with a filler block will delegate the interaction the controller block, meaning that any block within a multiblock can be interacted with as if it were the controller.