"I have since realized that this problem seems to be occurring only when I print directly from the internet. I can print a doc from the internet and get overprint, then copy the same doc into my word processor and the overpring is not there"
I have exactly the same problem when printing directly from the internet on my Epsom 760. When the doc is copied to appleworks ensure that "fractional font width" is selected. Otherwise the same problem would occur. I don't think there is a fault with your printer.
Vijay