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.

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.

Printer-Friendly WP vs wp-mpdf