Just a simple Laser holder for the cheap 5mW SYD1230 chinese laser, this laser is sold with 3 different kinds of lens,dot beam, linear beam and cross beam.
It have a design fault that is the lens focus screw that can easily get out of position if your machine makes vibrations or you touch the laser.
I resolved with a small hole in the front where you can glue the laser head when you find the correct position.