Air Assist Nozzles are only available for A40640 laser module - focus at about 30mm for cutting:

STL Download: A40640_P.STL

Air Assist Nozzles are only available for A40640 laser module - focus at about 55mm for cutting:

STL Download: 40640_3d.STL

STL and Gcode File Download: 40qz.STL , 40qz.gcode, This part is included in the NEJE 3 series machine kit or the module purchased separately;

NEJE solution：

4060.gcode — Print directly via 3d printer

AIR1.STL

AIR2.STL—The tracheal interface is 2mm in diameter, if you have other sizes, you can change it

tine 33 solution：

https://www.thingiverse.com/thing:4835350 — adapter

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https://www.thingiverse.com/thing:4835361 —improvised air assist:

The latest model of 2s machine, upgrade adjustment function, you can adjust the focal length without this device. It is recommended to use N30820, N30610, B30635 modules for the 2s machine;