I have had several AMS motor overloads in the last couple months. I went through the troubleshooting from a support ticket, and thought it had resolved… but no… 
The more resent troubleshooting revealed that the issue stopped when I took out the reusable spools from Bambu Lab… but, that proved to be incorrect as well.
Today, I finally stripped off some of the “old” filament (down to wear it stopped working), and found that there were several huge variances in thickness of the filament - and the place where it got stuck was one of those lumps in the filament. measured 2.19 mm and the imprint of the drive gear ended at that lump. So, it was the filament from eSun, specifically the PETG+ HS - this one was black.
I just want to put this info out there in case someone else was struggling with why their AMS motor kept getting overloaded.
Picture of the “jaming” blob.
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As an additional note, there were 4 more blobs on the filament in a span of 30’ of filament - the worst was a blob of 2.64mm - almost a full mm above the diameter of the filament.
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Nice job finding that. Thanks for posting, I’m sure it will help others. Good find.
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on the final stepper motor in the AMS, there are 4 bolts holding it down. Loosen them slightly and then clean with compressed air. This solved my overloading and feeding issues, although I couldn’t explain why.