Many people have contacted me about a 3115cn printer driver for OS X 10.6+. Unfortunately Dell hasn’t released a driver for it, and the old installer packet required Rosetta even in Snow Leopard. On a developer box I installed the driver and then created an install for the 3115cn to work on OSX Lion. I hope I have everything included, but please let me know if you are having trouble with the installer package. The package is older so it does require you to restart your computer on install. It also might ask you to repair the printer when created. Just do it and it’ll print fine.
**UPDATE – Youtube Video showing install of printer ***