Don’t yet own an AMS… because they are out of stock. But I see comments about the value of an AMS Saver. And there are at least a couple of different types.
But I don’t understand what problem an AMS Saver is solving! What is the “problem”? And how do they solve it?
Filament, specially the tough ones, wear the insertion funnel of the first stage.
Depending on the model of the saver, it helps avoiding tangles when the filament is been reespooled.