If you just use water in a lasercutter’s cooling system, eventually bugs will grow in it and it will go green and clog the valves, pump, and – worst – the laser tube. Manufacturers recommend changing the water regularly,
This is a brief blog post to get an idea into the public domain to prevent its being patented. I’ll probably work up more detail later. Plastic extrusions are widespread: guttering, pipes, curtain rails and so on are all examples.