This is Nichia laser holder for my 3018-type CNC machine.
There is github project with Kicad schematics and PCB for the laser diode driver based on PT4115 chip.
https://github.com/McGr3g0r/pt4115_cnc_laser_driver
Caution: thinkering with laser diodes requires wearing protective equipment !!!
Please use version 3 - it is a bit longer, with ver 1 it may be hard to get optimal laser to engraved object distance depending on the Z axis movement range.
The author hasn't provided the model origin yet.