We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a right perspective view of a printer showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines immediately adjacent the shaded areas represent the bounds of the claim design; all other broken lines are directed to environment and are for illustrative purposes only; broken lines form no part of the claim design.