The ornamental design for an endmillface, as shown and described.
FIG. 1 is a front perspective view of an end mill face.
FIG. 2 is a top view of the end mill face of FIG. 1; and,
FIG. 3 is a side view of the end mill face of FIG. 1.
The broken line showing of the end mill face is included for the purpose of illustrating portions of the end mill and forms no part of the claimed design.