L G , Jul 27, 2012; 09:45 a.m.
I think in this case Epson isn't telling the whole truth. It's true they don't make a transparency film for the printer, but some transparency films do work fine in their printers.
You will be able to find lots of information on the http://www.dpug.org/. The CarbonTransfer group on Yahoo http://tech.groups.yahoo.com/group/CarbronTransfer/ also has lots of information, and I think a majority of the people who print inkjet negatives for carbon are using Epsons. I have made them successfully on Pictorico with the 3880.