The ornamental design for a fan with suctioncup, as shown and described.
FIG. 1 is a first perspective view of a fan with suction cup showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a perspective view of another state of the fan with suction cup thereof; and,
FIG. 10 is an enlarged view of the selected portion in FIG. 1.
The broken lines shown in the drawings depict portions of the fan with suction cup in which the design is embodied that form no part of the claimed design.