How do you physically print Markdown files?

open the file in another editor. like notepad, word.. from there you can print.

You could use Pandoc [0] to render it into HTML and then open that in a browser and print it...

[0] https://pandoc.org/

Although I no longer physically print, Pandoc is probably the way to go to generate a PDF which you can then print. I wrote some notes in markdown on my little site [0] and with Pandoc generated a PDF from the same source file [1]. I shared my Pandoc setup I used [2] and hope this might be of help to you!

[0] https://danielwiese.com/posts/documentation/

[1] https://danielwiese.com/documentation.pdf

[2] https://github.com/dpwiese/.pandoc

You could type it into a private Github repo and print out the formatted web page?

There's a plugin to print in VS Code. Preview your markdown and print with the plugin.