Uploading firmware on different boards: GRBL / Marlin. Settings, parameters. - EnduranceLasers
Upgrading of a board with the Marlin firmware for laser engraving using an RAMPS 1.4 board as an example. - EnduranceLasers
RAMPS1.4 Laser Upgrade from J Tech Photonics, Inc.
Engrave Photos with PWM Laser - Repetier-Forum
GitHub - perivar/grblForRAMPS: RAMPS 1.4 fork of Grbl. An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino