Steph

The plugin contains two files. <code>print-css.php</code>, which is the plugin file itself, and <code>print.css</code>, a sample print stylesheet.
A link to the print stylesheet will be placed in your theme’s header, providing it uses the <code>wp_head()</code> function/hook.
An admin panel is added to the Presentations menu and it will allow you to edit the stylesheet if you make print.css writeable.
You probably want to edit the stylesheet provided to your liking, though it will hopefully do most of the job if your theme is sandbox-based.
I’m happy to include any improvements to the print stylesheet.
The print stylesheet will be used to print your blog pages, instead of the normal screen stylesheet.
<h3>Future Development</h3>
I’d love to be able to include a complete and rich print stylesheet. One that deals well with most major themes, and which actually does take some care to get the typography right. Get in touch if you feel you can help.

Bunny’s Print CSS

Inserts a link for a print stylesheet into your theme header. Provides a very simple print.css file that you probably want to improve upon, but which  …

fuzzoid

If you have a 3D printer and wish to charge for model printing this plugin is for you.
How it works:
Site administrator configures printers, materials and pricing in the admin. Customers upload their models, choose printer and material, see the estimated price, input their email address and comments and press the “Request a Quote” button. 
The admin receives the request notification by email and sends the quotes through the Price Request Manager or discards the quote requests.
Features:
<ul>
<li>Supported file types: STL (bin, ascii), OBJ (+.mtl), ZIP.</li>
<li>Configurable printers, filaments and coatings.</li>
<li>Build tray shape (rectangle, circle).</li>
<li>Material/coating shininess (plastic, wood, metal).</li>
<li>Transparent and glowing materials.</li>
<li>Customizable pricing: can be configured to charge per model weight, filament volume or bounding box volume.</li>
<li>Large file upload support (upload chunking).</li>
<li>Model scaling.</li>
<li>Drag and drop.</li>
<li>Filament price calculator.</li>
<li>Email notification.</li>
<li>Email templates.</li>
<li>Price request manager.</li>
<li>Translation ready.</li>
<li>Responsive layout.</li>
</ul>
Demo: http://www.wp3dprinting.com/3d-print-lite-demo/
Premium version of the plugin has all features of the lite version plus:
<ul>
<li>WooCommerce integration.</li>
<li>Laser cutting support.</li>
<li>Bulk Upload Mode.</li>
<li>Form Builder (NinjaForms integration)</li>
<li>File Manager</li>
<li>Extra file type supported: STP, IGS, DXF</li>
<li>Image printing: JPG, PNG, GIF, BMP files get converted to STL.</li>
<li>Can arrange multiple STL models from a ZIP file.</li>
<li>Model scaling (can scale axis independently).</li>
<li>Extra layout options.</li>
<li>Model repair & optimization (auto rotation for optimized 3D printing process)</li>
<li>Manual model rotation.</li>
<li>Infill calculation.</li>
<li>Per hour pricing.</li>
<li>Support material calculation.</li>
<li>Ability to add predefined models to products.</li>
<li>Email template manager.</li>
<li>Discount system.</li>
<li>Fullscreen mode.</li>
<li>Custom attributes with configurable price.</li>
<li>Ability to assign different printers and materials to different products.</li>
<li>Free support.</li>
<li>New cool features to come.</li>
</ul>

3DPrint Lite

A plugin for selling 3D printing services.

Bunny’s Print CSS vs 3DPrint Lite