More for personal use than as a note. Our Canon Pixma printer (model number: MG5750) is pretty excellent, but over time the likelihood of it actually printing when asked has decreased. The number one culprit is an inability to pull in paper, no matter what we do. Today that reached a head when printing some pictures and left us functionally without a printer, so I did some Googling and found this troubleshooting guide by Canon. On the one hand, it's pretty hidden; on the other, it's great that it exists at all.
Turns out there's a maintenance mode which "cleans" the feed rollers. No idea what it actually does, but my guess is some form of percussive maintenance, hence the warnings not to do it too often. Whatever it did worked though, and our paper is now gliding through smooth as a hot knife through butter 👍