Just a quick post about keeping the dust out of laser cutters
Australia is a very dry dusty country, and dust is a major problem for me with the laser cutter. If dust gets on the mirrors or lens, it gets heated up by the laser which then damages (spot burns) the mirror or lens
My machine, like most, has a large extractor fan in the rear of the machine, which sucks air out.
Air is drawn into the machine though any opening in the case, including the laser cabinet, but I saw no reason for air, and therefore dust, to be drawn though that part of the machine.
The simple and cheap solution is to buy household draft proofing strip from the local hardware store, and stick it where the door to the laser cabinet abuts the cabinet.
This worked best in the left of the picture, where the door presses directly into the foam strip.
It worked slightly less well at the top of the picture as the glue on this cheap draft excluder was not strong enough to prevent it being pushed downwards.
Nevertheless, it still provides a much better seal than there was before, and as you can see in this photo, there is no dust at all. And I promise I have not just cleaned it before taking the photo.
I have cleaned it, but not for months, as hardly any dust gets in.