Install the module height adjuster on the z-axis, and adjust the module height and focus by adjusting the M5 Allen key to slide the module up and down.



Please do not leave the equipment when the equipment is working, long-term stay may cause the material to burn!

Please wear protective glasses before operation!

Please do not touch the laser outlet with your hands. It may burn your hands!

Please avoid strongly impact on the machine!

Children under 14 years of age are prohibited from using this product!

Children over 14 years of age need adult supervision when using this product!

Avoid accidental touch by pets!

Adjust Focus

Correct focus adjustment for cutting with A40640 at focus 30mm.

The A40640 is an adjustable focus module. Guide image above is a guide for the best adjustment settings. You can use a flat-blade screwdriver to adjust the focus position. Proper focus selection is a critical factor for cutting. You may need to try more few times. In addition, adding air assist will enhance cutting and engraving results, resulting in cleaner edges and enhanced cutting thickness and cutting efficiency.

When the focus is adjusted to about 30mm from the light outlet with a flat-blade screwdriver, you can get a focus of 0.04×0.06mm, which is suitable for engraving stainless steel or black alumina and cutting etc.

Focus to 55mm, suitable for cutting thicker materials.

Low Light Adjustment

Set the right low light to find the focus more accurately.

Adjust the suitable low light through the software. The NEJE mode can be adjusted in the “Settings” column of the NEJE Win software; the GRBL mode can be adjusted in the “Grbl Configuration” of the laserGRBL software, which has been explained above.

Put a gray cardboard on the surface of the white material (such as plywood) as a focus reference to find the precise focus. A fine focal point can be observed through the protective goggles or the shade of the module.


Find the best focus by rotating the lens. If it is a module with a fixed focus, it is enough to find the distance between the module and the object. Usually, we use a certain thickness of material to pad under the module to help find the best position.

Power Setting

A40640 is a module specially designed for top engraving capability, the lightweight design enables fast engraving and perfect high energy density light spot, if more than 80% of your work is engraving, you can set 100% power, if you mainly use For cutting, it is recommended to set the power at 80%. A good thermal balance is conducive to the continuous stability of the power. 100% power can provide 12W+ pulse output, 80% power can provide continuous 10W output.

About air assist


 The air nozzle must be aligned with the cutting port to blow off the carbonized material, 
 otherwise it will be ineffective.
 The focus must be located at the lower position of the material surface, otherwise there 
 will be a certain degree of inhomogeneity in the X and Y axes. 
 This is the optical feature of the optical diode laser, not a quality problem.

When do you need air assist

Air-assisted engraving or cutting can only be used for engraving or cutting that produces more carbonized substances. Generally, the depth of engraving is less than 1mm, and the cutting of plywood less than 2mm does not require air assist. A small fan can be used to blow off the smoke generated by the engraving. Air assist is not recommended when engraving images, and adding air assist at this time will destroy image details.

What kind of air pump is suitable for cutting

The main meaning of air assist is to blow off the carbonized material produced by cutting, and the general oxygener and electromagnetic inflator have almost no meaning. only the pressure of the oil pump and air compressor (0.4-1.5mPa) has the effect of blowing away the carbonized material. but it should be noted that the air of the oil pump contains oil and cannot be directly used for the air-assisted module of the closed cavity, otherwise the oil will contaminate the lens, resulting in power drop or damage to the lens. The air pressure of the air compressor can be used for a short time with the closed cavity, but When used for a long time, the water-containing gas will contaminate the lens, cause the power to drop, and even damage the lens.

How to add air assist on the A40640 laser module

The NEJE A40640 module is an adjustable focus module. For the consistency of testing, the NEJE factory adjusts the module to 55mm focal length by default. This focal length is suitable for cutting thicker materials. This focal length is generally not commonly used. When you are suitable for the first use of the product, it is recommended to use a flat-head screw to adjust the focal length to about 30mm, which is 1-2mm away from the light baffle. This focal length has a very high focal power density and can directly engrave grayscale stainless steel images\ gray-black stone and other hard materials, NEJE A40640 can directly engrave 3D hardwood and other materials, and does not require air assistance, due to the high energy density design, A40640 can directly vaporize general wooden materials during the engraving and cutting process, so it is also unecessary to add air assist.

Download STL Files for NEJE laser module

Solution with Universal Air Assist Kit

Can be used with oil pump or air machine (can contain a small amount of water and oil)


STL and Gcode File Download:



This solution is not very robust, it is possible to print stronger 3D printed components and add glue to stabilize the structure.

Solution with clean air source (air compressor + air filter equipment)

If you cut sheets for a long time, air assist can help you complete the project more efficiently. You can add air assist at around 30mm or at 55mm, depending on the thickness of your material; NEJE will provide 2 different focal lengths. Download the air-assisted 3D printing module, the 3D printing material is more lightweight, and it will hardly affect the weight of the module. However, when using it, it needs to align the light outlet. If it is not aligned with the center of the light outlet, it may cause the laser to burn the 3D printing Gas nozzle.

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



E30130 module can directly use clean air source (4mm air pipe).


Please make sure that the air outlet is aligned with the focus point;

Cutting MDF board requires 0.6-1.5mPa air pressure to efficiently clean the carbonized material. The MDF board needs high-pressure gas to assist in cutting. The ordinary oxygener cannot provide high-pressure gas.

The air-assisted module designed in the cavity, try to choose a clean origin, oily or unclean origin may be Causes the lens to be broken at high temperature;

A40640 modules and modules with similar external air sources can work without air assistance, and the modules designed with the cavity must work under the conditions of increased air assistance, otherwise it is easy to contaminate the lens and cause the lens high temperature rupture;


Radiator Size:	40 x 50 x 60 mm
Weight:	204g
Speed of the Fan:	10600RPM(Double ball bearing)
Interface:	PH2.0 4Pin
Drive Design:	Built-in  
Input:	12V 4A +
Optical Power:	10W +
Wavelength:	450nm
Laser Class:	Class 4
Number of Diodes:	2
Light Source:	2 X LD + FAC Tech + C-Lens
PWM Input:	VPP(3.3-12V), Recomend 1KHz, 
Quiet Design:	Drive the built-in control ic, judge the working state and adjust the fan work.
Max Cutting & Carving Depth:	20mm (The data is tested by NEJE users, and it needs to be done under more accurate focusing and adding correct and certain strength of air assist.)
Brushed Stainless Steel Carving:	Yes
Mirror Stainless Steel Carving:	Yes

Material Database

NOTE: The data below need to add air assist correctly (0.6-1.5mPA) with laserGRBL or lightburn; lightburn: 60mm/min=1mm/sec,S1000=100% Power (In lightburn, the unit is 60mm/s)

A40640 Material Database


12V: Power positive .

GND: Power ground or power negative.

TTL/PWM: TTL = PWM, input 3.3V~12V to turn on laser module, conect to GND to turn off laser module.

Temperature: do not connect, please ignore.

Connect 12V and GND pin to 12V power, ensure the power adapter is sufficient, 5A is recommended.

Connect TTL/PWM pin to your control board PWM output pin.


Control Board

Multi-interface adapter board:

NEJE PWM Control Borad with Temperature Display:


Although this module adopts internal air-assisted design, long-term use may not prevent dust or a small amount of smoke from affecting the lens. It is recommended to clean the lens with a clean cotton swab. Dust or smoke may overheat the lens and cause the lens to burn out. Re-acquire the lens Will delay your use.

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