The invention provides a printhead assembly for a printer which prints
onto a moving web that follows a path. A full width printhead located
across the path of the printer. The printhead is a color printhead which
is at least as wide as the web. The printhead is supplied with a number
of different inks which are remote from the printhead and which are
supplied to the printhead through tubes. In some embodiments the
printhead is retained by a rail which is located across the path and
along which the printhead slides into and out of a printing position.