We claim the ornamental design for a printer accessory, as shown and described.
FIG. 1 is a top perspective view of our design for a printer accessory;
FIG. 2 is a top perspective view thereof, shown at an enlarged scale;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a top plan view thereof.
The broken lines in the drawings immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.