I tried using QuadTone RIP on my R1800
and wasn't happy. Images were grainy
and showed lots of banding.
But then I tried it with the Epson driver
and was very pleasantly surprised -- but
*not* by printing with black ink only.
All I did was to desaturate the image
completely. It remained, and was printed
as an RGB image -- using standard ICC
color management. In other words, the
printer didn't know it was a "BW" image,
and it really wasn't...