We claim the ornamental design for a printer, as shown and described.
FIG. 1 is a top perspective view of a printer showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right end elevational view thereof; and,
FIG. 5 is a left end elevational view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.