We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a top, front, right perspective view of a printer showing our new design;
FIG. 2 is a top, rear, left 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 formed by dashes depict portions of the printer and form no part of the claimed design. The dot-dash-dot lines represent unclaimed boundaries that form no part of the claim design.