For those who are running an air compressor (and not just a small air pump), be aware of the impact humidity will have on your air quality.
If you’re not drying your air, then you will most likely find water coming out from the laser nozzle. Now it’s too late. You also have water on your lens now! Uh oh. Get water on your lens, burn a hole in your lens.
Water also collects contamination on the lens. Lesson: use an air dryer and a filter if you are compressing your air.