I claim the ornamental design for a printer, as shown and described.
FIG. 1 is a perspective view of a printer of the claimed design;
FIG. 2 is a front view of the printer shown in FIG. 1;
FIG. 3 is a rear view of the printer shown in FIG. 1;
FIG. 4 is a top view of the printer shown in FIG. 1;
FIG. 5 is a bottom view of the printer shown in FIG. 1;
FIG. 6 is a left side view of the printer shown in FIG. 1; and,
FIG. 7 is a right side view of the printer shown in FIG. 1.
The broken lines immediately adjacent the shaded areas depict the bounds of the claimed design while all other broken lines are directed to environment; the broken lines form no part of the claimed design.