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).

fkrauthan

Print WordPress posts as PDF. Optional with Geshi highlighting. It also has support for password protected posts and only logged in users can print post as pdf support.
Note: You can find the development repository at Github: <a href="https://github.com/fkrauthan/wp-mpdf" rel="nofollow ugc">https://github.com/fkrauthan/wp-mpdf</a>
<h3>License</h3>
This file is part of wp-mpdf.
wp-mpdf is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
wp-mpdf is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with wp-mpdf. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

wp-mpdf

Print Wordpress posts as PDF. Optional with Geshi highlighting.

Print me! vs wp-mpdf