We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a top, front, right side perspective view of the claimed design according to a first embodiment;
FIG. 2 is a top, rear, left side perspective 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 depict environmental subject matter and form no part of the claimed design. The use of stippling on specific surfaces in the drawing shows a contrast in appearance.