Blender base

The design is the visual features of the blender base as shown in solid lines in the drawings, whether those visual features are features of shape, configuration, pattern or ornament, or any combination of those features.FIG. 1 is a perspective view of a blender base in accordance with the present design;FIG. 2 is a front view of the blender base of FIG. 1;FIG. 3 is a rear view of the blender base of FIG. 1;FIG. 4 is a side view of the blender base of FIG. 1;FIG. 5 is another side view of the blender base of FIG. 1;FIG. 6 is a top view of the blender base of FIG. 1; andFIG. 7 is a bottom view of the blender base of FIG. 1.The portions in dashed lines do not form part of the design.