The Epson Photo Stylus 3880 printer produces excellent results up to A2. One of its major shortfalls is that it does not have a paper roll option as available on Epson's older R800 A4 printer. I wanted print a Photoshop-stitched panorama using a 10m roll of Epson Premium Glossy Photo Paper and had an interesting afternoon of tries, failures, internet searching and success.
My research revealed that the standard Epson driver (for Apple Mac OS-X 10.7) will only print lengths up to 940mm (37"). However, it is important that you cut the roll into 940mm to 1m lengths. This is because on completing the print, the printer tries to eject all remaining paper - that can means up to 10m of it. With this methods I was able to print panoramas of dimensions 210 x 940mm.
One problem to watch is the 3880's tendency to smear the last 20-30mm (1") of the paper as it curls up on exit from the print head. The way to overcome this is to cut a slightly longer length (ie. 1m); use a roller cutter to get a good square cut to ensure that it feeds correctly.
There are other drivers, called RIPs, that are reported to be able to print longer panoramas but these are expensive. However, you will find the above technique a useful and inexpensive solution to printing reasonable sized panoramas.