The ornamental design for a puttingtrainingdevice, as shown and described.
FIG. 1 is a perspective view of a putting training device showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a front view thereof; and,
FIG. 6 is a rear view thereof.
The bottom of the putting training device is unornamented and not visible during normal use because the bottom of the putting training device will be placed against a putting surface during normal use. Therefore, the bottom view has been omitted. The undisclosed bottom surface of the putting training device is flat and unornamented and forms no part of the claimed design.