The ornamental design for a printer, as shown and described.
FIG. 1 is a front, top, and right side perspective view of a printer showing our new design;
FIG. 2 is a rear, top, and left side perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a left side view thereof.
The broken lines that are 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. In addition, the unshaded surfaces that directly adjoin the claimed solid line edges and the unshaded inner surfaces that adjoin the claimed solid line edges form no part of the claimed design.