FIG. 1 is a top left perspective view of the blender showing the new design; FIG. 2 is a front elevation view thereof; FIG. 3 is a back elevation view thereof; FIG. 4 is a right side elevation thereof; FIG. 5 is a left side elevation thereof; and, FIG. 6 is a top plan view thereof. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.