The author (Chris of Lost Wax) mentions that some people use acrylic paint to coat fine steel mesh, then use the laser to clear areas for making a screen. His technique with avocado looks like it works pretty well, if you want less-durable/reusable screens.
He appears to be using a 22 watt diode laser for this.
In any case, this might be a DIY alternative to the commercial xtools screens for those who want to play with lasering screens.
That’s cool - it’s also the first screenprinting article I’ve read that made it make sense for me! Let’s hear it for beginners writing the instructions - it’s better almost every time.