The alignment doesn't change over distance. The laserbeams are straight lines and over distance the triangle only gets bigger.
What I did found out is that turning the focus knob could throw up the alignment. The lenses aren't perfectly centered in the barrel and will deform the shape of the triangle.
It takes longer to finish my build because one of the LPC826 has died. I have ordered six LPC826 diodes and 4 of them already died.
You're right but that's not what i meant. What I was trying to say is that the isosceles triangle formed by the three laser beams might appear to be "perfect" at close distances, but as the beams diverge, the imperfections will become amplified and you will notice a difference in distance between all three dots.