royaldeer

This plugin adds an icon to all posts which links to Print-Friendly page with a content of the post. This plugin is very simple to use and very easy to modify, so with a little bit of coding skills you can customize a look of the Print-Friendly page.
“Sites that use the plugin: http://www.zemocigs.com/”
Plugin support: http://www.royaldeerdesign.com/

Printer-Friendly WP

This plugin adds an icon to all posts which links to Print-Friendly page with a content of the post.

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.

Printer-Friendly WP vs WordPress PDF Templates