Designed with hobbyists in mind, this engraving laser head can be mounted to a CNC machine in place of a spindle. With the laser head equipped, one can perform laser engraving on a CNC machine. This free file is also available at: 

https://optlasersgrav.com/ 

Also, the specifications for this laser head are shown in the link below:

https://optlasersgrav.com/laser-head