[Sanctor]

Next/Previous month buttons appear in the print output. It's like seeing a hyperlink in a book :) Maybe those could be hidden.

Other than that I like the idea. More and more I look for apps that do one simple thing and do it well.

[mindcrash]

That but pretty much the entire header, and the calendar is too wide to properly fit on A4.

Depending on how this thing is structured all these things could be easily fixed using a print stylesheet (https://inviqa.com/blog/print-stylesheet-definitive-guide)