The first and most obvious way to install an air assist into your k40 laser engraver would be to purchase a premade nozzle for your laser lens with a built air assist port from a manufacturer.
Laser cutter air assist nozzle.
The palletized system also provides 90 psi air for the purge and nozzle cooling requirement.
For laser cutting with compressed air on the sp500 there are additional copper nozzles with a hole diameter of 1 7mm for the short nozzles.
This auction is for a brand new 3d printed air assist head for your k40 and similar style laser cutters.
This directs air away from your lens assembly keeping the path of your laser clean so the beam can stay sharp greatly improving the quality and precision of your work.
Same with the laser too much smoke or other obstacles the power will go down and the quality with it.
Air assist is the help of a air stream keeping the cut or engraving clean from debris and smoke.
With these nozzles you can simply get a small air compressor and the correct sized flexible hose that will attach directly to the air intake port on the.
The laser beam works similar to your headlights on the car too much fog and the visibility goes down.