Description
Set a lower boundary condition on the comparator strip to output 1 of the resource you want when that resource falls too low. Only one signal will be served by the first station. The second station gets one of the other remaining/etc.
The belts here are poorly managed. This could be fixed by putting in more space and having requester chests at the north end of each station. But this also works. For higher through put you can add more stations, you just need to use the extra comparator to join green/red to strip out served signals.