FIG. 1 is a perspective illustration, from the top, rear, and right side of a laser line generator according to our design;

FIG. 2 is a perspective illustration, from the bottom, rear, left side thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a side elevational view thereof, from the right side;

FIG. 6 is a side elevational view thereof, from the left side;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken line showing of portions and features is included for the purpose of illustrating unclaimed subject matter and forms no part of the claimed design.