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I just experienced this for the first time. I has having to print slower and slower to get the filament to flow enough not to print skippy and stringy. Finally, the gears in the print head started skipping. I took the whole print head apart and found nothing wrong. Switched to the spare hot end that came with the printer and its printing like new again.
OP did you write the blog post or are you reposting? I’m mostly asking because I’d like to get your opinion on this book:
https://selfhostbook.com/