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Leo,
I have to admit that the unit I have is a 100W full industrial system.
By that I mean it came with a humongous fume extraction system that I vent to the outside, a proper refrigeration system to cool the tube water, and a small blower to push air over the lens area to keep it clean.
(This was my big retirement present to myself)
I'd suggest something at least to the standard of welding fume removal, with filters as appropriate. I believe there are also systems for use by nail salons-they're quit fum-ey.
I'd also suggest the refrigeration pathway. Some people simply use a bucket of cold water and feed the pump lines through that, but it quickly warms up and efficiency drops off.
Finally, the tube you linked to is peak rated at 50W. If you use it at that power, it probably won't last long. My branded '100W laser' has a 120W tube, with the instruction to only use as much power as you need.
It is more likely that the 50W will give about 40-45, and the 40W about 30-35.
Not wanting to dissuade you at all, it's a great project. I've made a CNC metal milling machine, a CNC foam cutter (for wings) and a CNC router myself.
Gives you a great sense of achievement when they produce something!
Cheers,
Neville
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