We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a top, front, right side perspective view of an embodiment of the claimed design according to a first embodiment;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines depict environmental subject matter and form no part of the claimed design. The use of stippling on specific surfaces in the drawings is used to show a contrast in appearance.