We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a front view of a printer;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a front perspective view thereof.
The broken lines shown in the views are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.