The ornamental design for a modular bedbase, as shown and described.
FIG. 1 is a left view of a modular bed base showing my new design;
FIG. 2 is a right view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof; and
FIG. 5 is a top plan view thereof.
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof; the broken lines showing the whole bed base are for environmental purposes only and form no part of the claimed design.
The modular bed base is shown in broken lines for illustrative purposes only, and forms no part of the claimed design.