Aleksandr Zelenin

By pressing this button the content of the page will be displayed in a print-friendly mode and allows the user to print it.
Shortcode: [printme] 
php function: printme_link();

Print me!

This plugin adds a "Print" button on every post and page (supports custom post types too).

Viljami Kuosmanen

WordPress PDF Templates
This plugin utilises the DOMPDF Library to provide a simple URL endpoint e.g. http://my-site.com/my-post/pdf/ that generates a downloadable PDF file.
If pretty permalinks are disabled. GET parameters (e.g. ?p=1&pdf) can be used instead.
The PDF output can be customized by copying the index-pdf.php file from the plugin directory to your theme and creating your own custom template for PDF prints.
Stylesheets used on the site are disabled by default, but you can define your own stylesheets within the pdf-template.php file. PDF Templates can be previewed as raw HTML at the /pdf-preview URL endpoint.
Source available at https://github.com/anttiviljami/wp-pdf-templates

WordPress PDF Templates

This plugin utilises the DOMPDF Library to provide a URL endpoint e.g. /my-post/pdf/ that generates a downloadable PDF file.

Print me! vs WordPress PDF Templates