Tutorial of installing the LU3-20A Laser Module on Ortur's Laser Marster3 LE - YouTube
Amazon.com: ORTUR 20W Laser Module LU3-20A, Higher Accuracy 0.08*0.08mm Compressed Spot Laser Head for All ORTUR Laser Engraver, Dual Fan Cooling, 380+ Colors On Metal Steel Engraving (Must Used with Air Assist)