The ornamental design for a printer, as shown and described.
FIG. 1 is a left-side perspective view of the printer;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a cross-section taken in the direction of line 8-8 in FIG. 2.
The broken lines immediately adjacent the shaded areas depict the bounds of the claimed design, while all other broken lines are directed to portions of the printer that form no part of the claim. The broken lines form no part of the claimed design. The stipple shading as used in this application is a drafting convention used to show a contrast with adjacent surfaces.