I had a client who was having issues installing the Dell v715w All in One printer on Mac OSx 10.7.4 Lion.
Dell doesn’t actually manufacture their own printers, they have Lexmark make them, and they slap their name on them. Needless to say, Dell doesn’t announce that to many people, and those having a hard time getting their printers to work tend to find themselves at at dead end. In order to use the Dell v715w AIO you need to download and use lexmark pro700 driver from here and download also need Gutenprint for Mac OS X.
Install the Gutenprint first, then install the lexmark pro700 driver, and you should able to print to the Dell v715w AIO from your Mac.