The ornamental design for a multi-function printer, as shown and described.
FIG. 1 is a perspective view of a multi-function printer;
FIG. 2 is a front elevation view of the multi-function printer;
FIG. 3 is a rear view of the multi-function printer;
FIG. 4 is a left side view of the multi-function printer;
FIG. 5 is a right side view of the multi-function printer;
FIG. 6 is a top plan view of the multi-function printer;
FIG. 7 is a bottom plan view of the multi-function printer; and,
FIG. 8 is a detail view of the encircled portion on FIG. 1.
The evenly spaced broken lines depict environmental subject matter and form no part of the claimed design. The line-dot-line broken line that encircles a portion of FIG. 1 and that surrounds the detail view on FIG. 8 forms no part of the claimed design.