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;
FIG. 8 is a left side elevation view thereof; and,
FIG. 9 is a detail view of the portion encircled on FIG. 2.
The broken lines depicts environmental subject matter and form no part of the claimed design. The dot-dash broken line encircles a portion of FIG. 2 that depicts a detail view in FIG. 9 and forms no part of the claimed design.