I wanted to add my solution to this earlier issue, but it was closed with no replies. I find I need this feature often. I want to print my Obsidian notes for my students, but obviously my own “to do: photocopy this” isn’t useful for other people to see. Here’s what I’ve got – works, probably not optimal.
in my CSS:
@media print {
code, code[class*="language-ad-noprint"],
pre, pre[class*="language-ad-noprint"] {
display: none !important;
}
}
and in my Obsidian note:
```ad-noprint
This will not be printed.
```
I use the “ad-noprint” because I’m used to doing that for other blocks/formatting. You could probably use whatever custom name you like. Note that I do have the Admonition plugin (9.x) installed.
Hope it helps someone else, or they post a better method! 
