The ornamental design for a printer, as shown and described.
FIG. 1 is a front, top, and left side perspective view of a printer;
FIG. 2 is a rear, top, and right side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side elevational view thereof; and,
FIG. 8 is a left side elevational view thereof.
The broken lines immediately adjacent to the shaded areas depict 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. In addition, the unshaded bottom surface that directly adjoins the claimed solid line edge forms no part of the claimed design.