After trying for a very long time to get my Dell AIO 924 printer to work with my MBP, I finally found the solution on a different site. What you need to do is install the driver for a Lexmark 2500 series printer:
http://support.lexmark.com/index?locale=EN&page=product&userlocale=EN_US&productCode=LEXMARK_X2500&focusedTab=DOWNLOADS#2
Go to that page and just select with Mac OS you have then download and install the driver, and after plugging in the printer, you will be in business. Just wanted to post this solution in case anyone else was searching for this as well.