Dell's OS X support is practically nonexistent and you may be out of luck. The most information I was able to supply for that printer can be found in this old post whose links are now broken.
At the time, research indicated the following Samsung driver would work, but the OP never responded so a resolution was never reached.
Go to Samsung's web page:
Click "manuals and downloads", then "driver". You will see one for OS X 10.3 - 10.7, which if true should work with Mountain Lion and may be compatible with your Dell 1100. The downloaded file is a fairly ancient self-uncompressing type, which does not bode well for success.
I have done the installation as explained above (with Samsung Driver) and I am quite sure that it worked. But since Friday (maybe there has been an update performed) I loose 1 or 2 inches of the top of my document, no matter which software does the print (LibreOffice or Word).
Does anybody have an idea ?