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The Smart Splitter is an upgraded version of the Splitter capable of filtering its input and handling overflow.

Given the most advanced item required to unlock them is the AI Limiter AI Limiter, Smart Splitters can be researched and unlocked as soon as in Tier 2.



Smart Splitter Smart Splitter is unlocked via the Caterium Research chain in the MAM MAM using:
AI Limiter
Reinforced Iron Plate


Smart Splitter
2 × Reinforced Iron Plate
Reinforced Iron Plate
2 × Rotor
Build Gun
1 × Smart Splitter
Smart Splitter
Caterium Research - Smart Splitter
1 × AI Limiter
AI Limiter


Unlike a standard Splitter, the Smart Splitter can be interacted with to access its UI. In this menu, a single rule (or 'filter') can be set to each output, labeled Left Output, Center Output, and Right Output.

The capabilities of the Smart Splitter can be useful on several occasions, such as for sorting mixed conveyors or handling overflow by feeding excess parts into the AWESOME Sink.


  • Any: The output will behave just like a normal Splitter. Parts will be evenly distributed across this output and any other available outputs. Appears by default in the center output.
  • None: The output is unused. Appears by default in the right and left outputs.
  • Any undefined: Same as Any, but parts that have their own designated filter won't pass through this output.
  • Overflow: This output will only be used if there are no other outputs to use. If multiple outputs have this filter, overflowing parts will be distributed evenly among them.
  • Item: Only the selected item will pass through the output. Its recipe has to be unlocked first for it to appear in the list, making some items like SAM Ore SAM Ore or Plutonium Waste Plutonium Waste not appear in the list whatsoever.


Similar to normal Conveyor Splitters, the Smart Splitter can buffer up to 9 items. If at least one output has overflow, 2 items will always be buffered and prevented from overflowing. However, this buffer may hold items that cannot possibly exit through any output other than overflow, leading to them being contained forever (unless rules are changed or the Splitter is dismantled). This may pose an issue if, for example, radioactive items are sent through, as they will emit radiation while buffered.


  • The functionality of Programmable Splitters can be replicated by chaining Smart Splitters
  • Smart Splitters can be used to construct a belt compressor. Read more: Balancer#Belt compressor
  • Smart Splitters can be used to make a pressure relief valve for a circular Conveyor Belt. Build a Splitter and a Merger on the main belt with the splitter downstream, connect the two with a side belt, then place a Smart Splitter on the side belt with its free output set to Overflow.

Current issues[]

  • Smart Splitters currently display fluids as a sorting filter despite not having any fluid inputs



See also[]