The ornamental design for a crayonmelter, as shown and described.
FIG. 1 is a perspective view of a crayon melter showing our design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a bottom view thereof.
The even-length broken lines depict features of the crayon melter that form no part of the claimed design. The appearance of the space within the tear-drop shapes located approximately midway between upper and lower ends of the claimed crayon melter is explicitly disclaimed.