Back on 2023-09-03, W-Stool asked about printing source code, and I said I do it using GNU enscript, but never followed up with the actual command. (See: https://news.ycombinator.com/item?id=37366968)Tonight, I wrote up the command in a little GitHub Gist.
Not sure if this will be helpful to anyone else, but maybe this will save someone some trial and error.