I can sympathize with your problems. I spent 2 days trying to make my LJ 2100 TN work with OS 10.8.2. The kicker was that when I tried to add the printer to my existing [ethernet] network with my new iMac on Wi-Fi it killed the existing network. No computer could now print! I could still get on-line though.
I did a lot of research on the net; I called my ISP and did learn how to get the IP numbers on each device; I called Mac Tec, they passed the buck, saying because I wasn't using a Mac router they couldn't help.
I solved the problem today; I hope this helps...
When I tried to add the printer to 'Print & Scan' the 'Add' window comes up; and even though I made the 2.12 download, there were no print drivers to be seen. Apple in it's infinite wisdom left out the 'Advanced' icon in the 'Add' window. Right click the header and add it. Now there is a function to actually search for the print drivers.
You will have to choose 'Type'. I tried a few but 'Jetdirect' worked best for me. NOTE: your printer should be on before you make your choices in the 'Add' window.
Add your printer's IP number in the 'URL' field.
In the 'Use' field, select your proper print driver.
If you did it all correctly, the 'Add' button will light up and hopefully add a new printer to the 'Print & Scan' window.
Good luck. [I also had the delete and replace the printer on my other 2 computers in the network to make them able to print again.]