Summary
A Piler can both stack and unstack items. The stacking occurs when the items enter the Piler from its lower end.
A Piler will only stack two cargos if one comes directly after another, at minimum possible distance. Otherwise, the cargo will be released instantly without waiting for the next one to come. Only items of the same type can be combined into one stack.
Two double-stacked cargos can be stacked again into a four-stack. Triple-stack can be created from a double-stack followed by an unstacked cargo, or vice-versa. The limit of stacking is 4.
When unstacking, a double-stack will be split into single items, one coming directly after another, a 4-stack will be split into two 2-stacks, and a 3-stack will be split into a 2-stack and a single item.
Production Chain
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