The file 'Neje 20W N30820 / Neje 30W A30130 Air Support Nozzle 3D Printer Model' is (STL) file type, size is 250.4KB.
Simply mount air nozzle on focusing lens.This should also fit on other Neje laser modules like A30130External diameter of air input is 5mm.
Nozzle mounted on laser:https://www.youtube.com/watch?v=fPiL8KUA4E4
