3D printer laser bracket, vent and eye protection tube

I read a great instructable by [Jakes Workshop] to turn a 3d printer into a laser engraver, and so I created a bracket for my 2.5 watt laser and Tronxy X3 that i bought from gearbest. I've read about laser safety and at least understand the attributes of the laser class system, so the intention was to take a class 4 laser and incorporate it into a class 1 laser system, but the machine as it works is a little short of that goal. What it does do with the adjustable vent and eye protection tube is