The ornamental design for a modularcomputingdevice, as shown and described.
FIG. 1 is a front-left-perspective view of a first embodiment of our modular computing device;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right-side view thereof;
FIG. 5 is a left-side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
It is to be understood that the bold, dash-dash broken lines located adjacent to the right and left side edges of the seven, protruding, vertical elements represent the bounds of the claimed design while all other broken lines are directed to environment only and form no part of the claimed design.