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- Inserter B connect to belt A with red wire, and to inserter A with green wire.
- Inserter B only read contents (hold) but is always enabled.
- Belt A is enabled if everything = 12 (maximum stack size), that is, it is enabled only when inserter B holds a full stack.
- Inserter A is enabled if everything < 12 (no read).
Essentially it works like this: When inserter B starts dropping its stack inserter A will also start dropping but the belt A will be disabled. When inserter B runs out and picks up a new stack the belt will turn on and items flowing from inserter A now block inserter B from dropping any items. When Inserter A runs out and turns around to refill then inserter B gets to drop one item in the gap, which disables of the belt and the cycle restarts. The condition *<12 on inserter A is to ensure alternating operation also when the belts are blocked and moving slow.
blueprint 2 wagons 6 belts
bluepring 4 wagons 12 belts
