We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a top, front, right perspective view of a printer, showing our new design;
FIG. 2 is a top, front, left perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side elevation view thereof; and,
FIG. 8 is a left side elevation view thereof.
The broken lines immediately adjacent to the claim represent 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.