LightBurn Compatible LX4s C02 Laser Controller Board
[LX4s]

This board is a game changer! I'm running at lower power and faster speeds. Engraving quality is phenomenal. In addition to that, you simply could not ask for faster and friendlier customer service. If I could tack on an extra star for that I would. This is absolutely one of the best modifications you could possibly make to your K40 engraver/cutter.