I claim the ornamental design for a printer, as shown and described.
FIG. 1 is a front perspective view of a printer showing my new design;
FIG. 2 is a front view of the printer of FIG. 1;
FIG. 3 is a rear view of the printer of FIG. 1;
FIG. 4 is a top view of the printer of FIG. 1;
FIG. 5 is a bottom view of the printer of FIG. 1;
FIG. 6 is a right side view of the printer of FIG. 1; and,
FIG. 7 is a left side view of the printer of FIG. 1.
The broken lines shown in the drawings represent portions of the printer that form no part of the claimed design. Broken lines formed of unequal length dashes (i.e., dash-dot) show the boundaries of the claimed portions of the printer and these lines also form no part of the claimed design.