The page is for model NEJE 3 Max (460x810mm)installation manual.

What NEJE 3 Max has improved:

  • You can safely and stably upgrade to the latest GRBL firmware through NEJE software, When using the device for the first time, please open the NEJE software to update to the latest firmware.
  • NEJE 3 Max optimizes the low-light experience in GRBL mode for diode lasers, and the low-light settings can be adjusted through the laserGRBL software.
  • NEJE 3 Max is compatible with M8, M7, Door functions, and automatically adapts to lightburn, laserGRBL and NEJE software for better automation of processes.
  • The motor is automatically locked when power is turned on, and secondary processing can be performed when repeating the engraving work, so that the position information will not be lost.
  • NEJE win software adds area customization settings, NEJE provides the function of expanding the orbits, both the Y-axis area and the X-axis area can be freely expanded, and the laser module also automatically engraves silently.
  • NEJE 3 Max comes standard with a high-pressure air assist kit.
  • NEJE 3 Max adopts all-metal frame + PC CNC structural parts, which improves the stability of the structure and enhances the smoothness of movement. It also adopts easy maintenance driving structure.
  • NEJE 3 Max comes standard with M8 air valve kit for controlling air assist, M7 relay switch kit for controlling smoke exhaust system, and Door switch for emergency stop.
  • NEJE 3 Max is equipped with a towline as standard to organize air pipes and wires for easy installation into a closed box.
  • NEJE has greatly enhanced the anti-static and surge design under the new control system. NEJE has passed the very severe test in the experiment, which has greatly improved the reliability of the NEJE control system. The new system does not require additional grounding to protect equipment.
  • The new laser uses a high temperature resistant window to protect the lens, which effectively improves the service life of the lens.

Step 1: Structural Install

Tutorial for 3 Max V2 Installation (video)

NEJE 3 Max with A40640 Laser Module Installation Instructions:

The Louisiana Hobby Guy review.

In order to ensure that the product is absolutely reliable after each user receives the product, NEJE has done a complete machine test for each device, you only need to simply install 6 screws to complete the initial assembly.

It is recommended to install the X-axis drag chain support frame first, and then install the X sliding assembly;

The M7 relay module is generally used for the control of the smoke exhaust system. Some users also use it to control the oxygenator, which is not very safe! M8 air valve is generally used to control the air circuit of the user. You need to cut the air pipe according to the actual situation, and connect the other end to the air compressor or other air source; Y-R motor don't forget to connect.

M7 relay expansion accessories, can be used to control AC or DC power supply smoke exhaust system, can also be used to control other circuits, used as M8, there are safety risks when operating high-voltage circuits, requiring professional operation; M8 valve expansion accessories, can be used To control the air compressor switch.

NEJE did not match the M4 screws to fix the air valve. NEJE designed this air valve with a control line length of 1 meter, mainly for external use. NEJE retained the machine installation plan, and some users may receive products that do not include 2 M4x6mm screws, sorry for the inconvenience.


It is recommended that the 4 feet be fixed on the wooden table top with corner codes, if you are interested, you can download the CAD file Laser_Box.DWG to make a simple protective box.

Push the left and right sides to the end position to ensure parallelism; connect the power supply, the motor will automatically lock the motor after power on;

Make sure to push this laser Gantry to the TOP RAIL BY HAND when assembly is done! This will ensure the left and right stepper motors and timing belts are in sync. The TOP RAIL has hard, equal stops; the bottom does not!

When you are ready, you can start the following work.

Step 2: Safety Attention


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!

Step 3: Place Materials

Make sure the plane of the engraved material is at the same distance from the laser, so that the focus position is consistent and the engraved image is burned evenly.

Step 4: Adjust Focus

When carving or cutting 3mm materials, set the focus directly on the surface of the material; when cutting 4mm material, set the focus at 1mm position under the material surface.

E40 is a fixed focus design module. Please do not rotate the internal lens like the A40640 module, which will cause damage that cannot be repaired. At present, the focus of the E40 is 5mm from the heat sideline.

The A40640 is a variable -scorched knife module, with high energy density and knife -shaped design, making the A40640 a module with the highest efficiency and extremely exquisite sculpting effect. Neje is recommended to use the X -axis scan when scanning the Lightburn scan operation. Line Interval ( mm): 0.35-0.4

 The NEJE A40640 module adjusts the focus to 55mm by default. 
 This is because the NEJE factory has to ensure the consistency of product testing. 
 When you receive the product, it is recommended to use a flat-blade screwdriver to 
 adjust the focus to 10-15mm from the heat sink, The first time I use suggestions to adjust to 15mm position.

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

The default weak light is the unique design of Neje. This is to directly use the output light to locate the carving area. If you are used to using the operation method of CO2, you can set the weak light intensity or turn off through Lasergrbl.

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.

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.


Step 5: About air assist

Method 1: Do not use air pumps. A40640 and E40 modules (after removing the air mouth) can be carved and cut directly (the thickness is recommended to be less than 3mm, the fir board can be less than 8mm), the built -in fan has the function of smoke exhaust. Generally, This is the most commonly used way and the most portable.

Method 2: Use the oxygen hemers to protect the lens. This method can provide oil -free and water -free gas source protection lens. It does not receive pollution for a long time. It is suitable for long -term carvings and thin density materials for thin materials, but it cannot provide sufficient air pressure to increase MDF The carving and cutting performance of materials such as board, leather, hard paper and other materials.

Method 3: Use the inner diameter of about 1mm metal trachea as an air assist. This method can be provided with lower -cost inkjet equipment to provide more than 30PSI pressure, and small air compressor engine oil and water will not pollute the lens. For MDF boards, leather, hard paper, etc. The cutting of materials has a improvement effect.

Method 4: (suitable for professional players): use standard metal wind mouth+industrial oil and water filter+woodworking air compressor. This method is suitable for long -term multi -frequency operation cutting tasks, with E40 and E80 modules, to enhance the cutting performance of more powerful and portable operations, control through the M8 instruction+electromagnetic air valve The performance is very low. If you are a professional player, you can simply purchase a professional small oil and water filter, but don't forget to release the sewage in the air pump frequently)


Step 6: Software Download

Install Driver(The old Win system needs to be installed, Ignore if driver is already installed)

.NET Framework 4.8 — Win software operating environment, Ignore if win10 and above

NEJE_v6.1.8.exe When using the machine for the first time, please open the NEJE Win software first to check the latest firmware update. The NEJE team will continue to optimize the NEJE firmware and GRBL firmware to provide you with more surprising experiences.

official website of laserGRBL

official website of Lightburn

NEJE APP for Android v3.0.3.apk Download from Google Play Store (Support OS: Android 5.0 or later)

N-Scanner for Android (mainly uses the fast transmission between the engraving materials in your mobile phone and the NEJE Win software. You can directly shoot the image or file through the mobile phone or quickly transfer the content of the photo stored in the mobile phone to the computer for editing and engraving)

"NEJE 3"NEJE APP for iphone, iPad, macbook Support OS: iPhone (iOS 10.0 or later), iPad (iPadOS 10.0 or later), Mac (macOS 11.0 or later)

Step 7: Software operation

NEJE A40640 Laser & Material Database

NEJE E40 Laser & Material Database

Firmware Update

When using the device for the first time, please check whether there is a firmware update. The Neje team will continue to optimize the software and firmware to help you get a more portable operating experience.

Module carving parameter settings, please find the corresponding model model in the menu. Neje provides a typical parameter settings of laser materials.

Start with NEJE Win Software

NEJE V6.1.2:

Choose an image (.bmp .jpg) from: Photo Gallery, My Collection, Load Image from My Computer, Insert Text, “NEJE Scanner”APP:

Cut the range that needs to be engraved:

Set image size:

To adjust the rendering, or not to:

Special effects processing:

Box positioning:

Point positioning, precise control at 0.075mm accuracy:


Start with “NEJE 3” Android APP


Grbl Configuration

How to set low light intensity in GRBL?

Write any value from 0.08 - 0.5, The value means % laser intensity, please proceed with caution,If you modify the parameters and cannot restore the default firmware, you can re-update the firmware in NEJE Win software.

Please refer to the official instructions for laserGRBL. It should be noted that NEJE 3 Max has added M8, M7 and Door to adapt to laserGRBL. In addition to the low-light settings mentioned above, you need to add M8 to the .nc file to control the air to open, M7 controls the exhaust to open, M9 controls them to close.

Start with Lightburn

Initialize lightburn settings:

Area setting: X: 810×460 Y.

Origin X0,Y0: Front Left. Auto “Home”.


How to start M7 in lightburn:

Device Settings

Start G-code: M7

For the use of lightburn software, please refer to the lightburn official documentation. It should be noted that the M8 function needs to be turned on in the lightburn layer setting, and the M7 needs to be manually turned on by referring to the previous method. Lightburn defaults to signal the M9 to turn off the engraving end, and the Door function only works in lightburn mode. Can be stopped, but cannot resume engraving after stopping, NEJE mode and laserGRBL mode can resume engraving after the Door function is activated;

Offline control

NEJE 3 Max built -in Neje and GRBL dual firmware. The Neje firmware can be used as a controller. It can be used as a virtual instruction controller. Through Neje software, the .gc file exported by LightBurn through the latest Neje Win software transmits files to the device through wireless ways, or can also Perform the operation directly through the Neje software control .gc file. This is currently the most advanced and more portable control method.

The Neje control board has updated the NEJE traditional “One Key Start” function, which can manually switch mode, positioning, start, suspension, shutdown and other operations.


  • Dust cleaning: regularly clean the dirt and dust on the tracks and wheels, and check the tightness of the timing belt.
  • Lens cleaning: Smoke from engraving or cutting, or oily air sources may contaminate the lens. After contaminating the lens, the lens will be broken due to the high temperature of the laser. It is recommended to use alcohol to clean the lens surface frequently;
  • Moisture-proof storage: If your laser machine is not used for a long time, we suggest adding some anti-rust oil to the metal places such as the screws and bearings of the machine to avoid metal rust, and store it in a dry environment.


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