If you upgraded to OS X 10.8 Mountain Lion and your printer stopped working please see the update at the end of this article. However, I will not provide support if you struggle installing the printer. In order to remember the stuff I just did I will now shortly describe the process. However, since I got a new MacBook Pro I needed to reinstall the printer and, of course, some things changed.
Three years ago I managed to install the printer by using open source tools and drivers. Unfortunately this printer is not compatible with OS X. In 2009 I got a HP Color LaserJet CP1215.