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I do that out of paranoia/mistrust for my wifi network, printer, printer software, etc.

It's probably fine to just print it out, but for more sensitive items I definitely write it down by hand.

It's not as if the printer keeps a hidden cache of printed pages. Except maybe it does...even if the feature was created for entirely benign reasons.

It’s not as if photocopiers could randomly replace letters or numbers, right? …right?

That's one of the instances of "built with good intentions" I had in mind.