Belt Compressor module to accommodate variable resource intakes and/or outputs (Feeding Mega Factories from Trains or multiple Miners)

Chain them together to distribute, for example, multiple 600/min Quickwire lines into factories with varying demands (like 300/min; 720/min; 69/min)

Overflow will be passed to the RIGHT and try to fill the adjacent Belt

Loop the output of the Right Merger into the LEFT Splitter to fill Belts on the left side with overflow from belts on the right (Pic 3)

Left Splitter: Helper line or Recycling line

Middle Merger: Output to Factory

Middle Splitter: Input

Right Merger: Connect to next module

See Satisfactory Wiki - Belt Compressor for further info