I’ve had the same problem with the refills. In my case, at the edges of the spool the filament ‘dove’ down under other filament. As the unwinding filament gets to the edge of the spool the AMS is unable to feed any more. It has happened in 2 out of about 16 reload spools I’ve used. In my case I manually unwound and then rewound a couple layers from the spool. Bit of a pain, but it works.
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