The ornamental design for a cuttinginsert, as shown and described.
FIG. 1 is a front perspective view of a cutting insert showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a sectional view thereof taken along line 8-8 in FIG. 3; and,
FIG. 9 is an enlarged partial top view thereof.
The broken lines in the drawings depict unclaimed environmental subject matter. The dash-dot-dash lines directly adjacent to the claimed areas are included to represent the boundaries of the claimed design and form no part of the claimed design.