The ornamental design for a cuttinginsert, as shown and described.
FIG. 1 is a perspective view of a cutting insert showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 2.
The surface shadings and broken line environmental showing is for illustrative purposes only and forms no part of the claimed design. Dash-dot broken lines show boundaries of the claimed design.