The newsdog_BOTTOM file forms the base, with an internal shelf to hold a thermal printer unit. It should be printed in white.
The newsdog_TOP file forms the main body, and fits snugly over the base. It should be printed in white.
The newsdog_ears_nose_tail file includes parts that snap into the main body to form the figure's ears, nose and tail. It's best printed in a color that contrasts the base and mail body, such as black.
The thermal ink printer that's inside the NewsDog can be found in the Adafruit catalog. Here's a kit that includes the printer, its power cord, and a roll of receipt paper: http://www.adafruit.com/products/600
To get it connected to the Internet, check out this tutorial: http://learn.adafruit.com/internet-of-things-printer/introduction