Laser not shutting off

[beamer3.6 (L H)]

I have a 3.5w diode laser and have managed to cut 4mm plywood…

… The secret was air assist.

The power of air assist

I added air assist to my 3.5w diode laser with the hope that it would cut perhaps 2mm wood. I initially borrowed a fellow forum members 3d printer skills to obtain an adapter to fit the laser but this delivered the airflow a little too high and it was so noisy due to the diameter of the inlet. So I needed to change the noise issue and so I used a metal drinking straw which I feel directs the air better and increases the psi(?) as it’s a smaller outlet (5mm instead of 10mm). The noise is now g…