The settings should be the equivalent of:
Roll paper (banner), Borderless checked, retain size, normal cut.
User defined paper size, paper width 17.00 inches, height 11.00 inches
Note that you will need to be using one of the 250 or 260 paper types with the machine set to roll/cut otherwise the printer will assume the paper has too much curl and will feed out a longer leader.
For the 9880 driver "retain size" is the only option with this size for some reason so you will need to make the image slightly larger than 17 inches to avoid a sliver of white on one edge (like 17 1/4 inch).
The epson's will only print borderless at the positions that have a sponge in the bed of the printer to soak up overspray.
Hope this helps but all I have is a 4000 and 9880 so I'm giving the RMS settings.
Doug