A sharp corner occurs when two sides of a part intersect at a point and create an angle, in the interior of the part, that is less than 180°. The toolpath around a sharp corner can be one of three types.
Sharp
Choose Sharp to
force two consecutive parts of the toolpath to intersect at a point.

Round
Choose Round to
force an arc to be inserted between two parts of the tool path.

Loop
Choose Loop to
force a loop to be inserted between two parts of the tool path.
