The ornamental design for a mobileprinter, as shown and described.
FIG. 1 is a front, bottom, and right side perspective view of a mobile printer;
FIG. 2 is a rear, top, and left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side elevational view thereof; and,
FIG. 8 is a right side elevational view thereof.
The broken lines immediately adjacent the shaded areas depict the bounds of the claimed design, while all other broken lines are directed to environment. In addition, the unshaded surfaces that directly adjoin the claimed solid line edges form no part of the claimed design. The broken lines form no part of the claimed design.