Now I have found a new issue on two of my red Bambu refills. Everything starts out fine, I load the refill onto a spool and install into AMS. Everything works fine.
The next morning I come down to find printing had stalled a couple of hours later. The cause, the filament was tangled within the spool. This isn’t the issue where loading a refill causes filament at the edges of the spool to be buried under other filament and get stuck, this was the filament passing under a bundle of about 10 strands of other filament. I had to remove the spool, completely unwind the spool by hand as there were multiple multiple multiple tangles within the spool.
When I was about to load another red refill, I loaded it normally onto a spool and then rewound it onto another spool. Again part-way into the spool I encountered twists in the filament, so I had to completely unwind by hand, and then rewind.
I think I’m going to stop buying refills,