You set your current to 2.5amps? You’re gonna burn that diode up pretty quick at that level. How far is the laser from the object being etched? In your first pic it looks like close to six inches. These lasers focus at about 2 inches. Move it to that distance and go from there. A fine adjustment can be done by screwing or unscrewing the lens a little at a time. You told me you burned your first laser before i posted my guide and it wasn’t an ndb7875 diode either right? Where did you get The2.5 amp setting from?