Laser mount for my smartrapcore and for a cheap Chinese laser found on Aliexpress.
https://fr.aliexpress.com/item/500mw-405NM-focusing-blue-purple-laser-module-laser-engraving-TTL-module-500mw-laser-tube-Laser-module/32562052620.html

I use the same holes of the jhead adaptor so there is no need to make new holes.

Video in action : https://youtu.be/Yhf-L6cL2hU

As you can see, laser feet behind the extruder, no need to unmount when you want to print.
Simple user the FAN port of my ramps to power ON/OFF the laser with a M106 command

Use Inkscape + J Tech plugin to generate GCODE

See these Instructable : http://www.instructables.com/id/Convert-a-3D-PRINTER-to-LASER-ENGRAVER-Under-40/

Theju