DIY Arduino based CNC laser engraver from DVD drive - YouTube
Simplest CNC Machine with Minimum Parts Possible - DIY Laser Engraver
Amazon.com: ANNOY TOOLS Engraving Module,500mW Output Power Laser Engraver Accessories TTL/PWM for CNC Machine 3018pro/3D Printer/Arduino (500mW)
Amazon.com: 20W Engraving Module, 450nm 5.5W Optical Power Engraving Module Kit for Arduino 3D Printer,CNC Milling Machine 3018 Pro/3018 Max,CNC Router, Engraving Tool for Wood and Metal DIY with Eye Protection