The ornamental design for a crownmoldingmiter saw guide, as shown and described.
FIG. 1 of the drawings is a perspective view showing the front, top, and left side of a crown molding miter saw guide embodying the design of my invention;
FIG. 2 is a front elevation view the miter saw guide;
FIG. 3 is a top plan view;
FIG. 4 is a left side elevation view;
FIG. 5 is a right side elevation view;
FIG. 6 is a back elevation view;
FIG. 7 is a bottom plan view; and,
FIG. 8 is a reduced-in-size perspective view of the front, top, and left side of the crown molding miter saw guide illustrated with its usual environment that is not part of my design, said usual environment being shown in broken lines.