The ornamental design for a printer, as shown and described.
FIG. 1 is a perspective view of a printer;
FIG. 2 is an enlarged view of section 2 in FIG. 1;
FIG. 3 is a right-side view of FIG. 1;
FIG. 4 is an enlarged view of section 4 in FIG. 3;
FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4;
FIG. 6 is a bottom view of FIG. 1;
FIG. 7 is an enlarged view of section 7 in FIG. 6; and,
FIG. 8 is another enlarged perspective view of FIG. 2.
The broken lines shown in the drawings illustrate portions of the printer that form no part of the claimed design. The dot-dash chain lines depict a boundary of the claimed subject matter and form no part of the claimed design. The darker broken lines shown in the drawings that demarcate portions of the printer indicate the section shown in the enlarged views and form no part of the claimed design.