Laser Engraver Blogs

If your Nano Duo screen is stuck on the LONGER logo during startup, the issue is usually related to corrupted or incomplete firmware. Fortunately, the problem can typically be resolved by reflashing the firmware using the official recovery method.

This guide explains the complete process step by step in a beginner-friendly format while preserving the original flashing procedure and settings exactly as required.

Table of Contents

1. What This Guide Covers
2. Quick Answer
3. Why This Process Matters
4. Before You Start
   • Requirements
   • Precautions
5. Step-by-Step Tutorial
6. Common Problems and Solutions
7. Tips for Better Results
8. Frequently Asked Questions
9. Final Thoughts

What This Guide Covers

This tutorial explains how to recover a Nano Duo machine when the display freezes on the LONGER startup logo.

You will learn:

• How to prepare the firmware flashing tool
• Which firmware file to use
• How to configure the correct flashing parameters
• How to erase and reflash the firmware safely
• What to do if the process does not complete successfully

The instructions below preserve the original operation sequence and parameter values exactly.

Quick Answer

If the Nano Duo screen stays stuck on the LONGER logo during startup, reflash the firmware using flash_download_tool_3.9.5.exe, select ESP32-S3, load firmware_grbl.bin, set the firmware address to 0x0, choose the correct COM port, set BAUD: 912600, then click ERASE followed by START. After the process displays FINISH, restart the machine.

Why This Process Matters

Firmware controls the startup and operation of the Nano Duo. If the firmware becomes damaged, incomplete, or corrupted, the machine may fail to boot normally and remain frozen on the LONGER logo screen.

Reflashing the firmware restores the machine’s core system files and allows the Nano Duo to start correctly again. Following the official flashing sequence carefully helps avoid additional startup issues or failed firmware recovery attempts.

Before You Start

Requirements

Before beginning, prepare the following items:

• Nano Duo machine
• Windows computer
• USB cable compatible with the machine
• flash_download_tool_3.9.5.exe
• firmware_grbl.bin firmware file

Follow official machine specifications or instructions if additional drivers or accessories are required.

Precautions

Before performing firmware recovery, keep these important safety notes in mind:

• Do not disconnect the USB cable during flashing.
• Do not power off the machine while firmware is being written.
• Make sure the correct COM port is selected.
• Double-check all parameters before clicking START.
• Close unnecessary software to reduce communication interruptions.
• Use a stable power source during the process.

Incorrect flashing parameters or interrupting the process may prevent the machine from booting properly.

Step-by-Step Tutorial

Step 1: Prepare Tools

Action

Use the flash_download_tool_3.9.5.exe tool.

Expected Result

The firmware flashing tool is available and ready to launch on your computer.

Important Notes

Ensure the tool is fully downloaded before opening it. Running incomplete or corrupted files may cause flashing errors.

Step 2: Preparing Firmware

Action

Prepare the firmware file:

firmware_grbl.bin

Expected Result

The firmware file is ready to be selected inside the flashing tool.

Important Notes

Do not rename the firmware file. Keep it in an easy-to-find folder on your computer.

Step 3: Open the Flash Tool

Action

Open the flash_download_tool_3.9.5.exe tool, select ESP32-S3, and click OK.

Expected Result

The tool enters the main flashing interface homepage.

Important Notes

Selecting the correct chip type is critical. Ensure ESP32-S3 is selected exactly as specified.

Step 4: Configure Firmware and Flash the Machine

Action

After entering the homepage:

1. Click the three dots in the middle.
2. Find the prepared firmware and open it.
3. Change the firmware to: 0x0
4. Select the COM port corresponding to the machine's port number.
5. Select BAUD: 912600
6. Click ERASE and wait for the status to complete.
7. Click START and wait for the status to display FINISH.
8. Power off and restart the machine.

Expected Result

The firmware flashing completes successfully, and the machine restarts normally instead of remaining stuck on the LONGER logo.

Important Notes

• Wait patiently during both the ERASE and START processes.
• Do not disconnect cables or close the software during flashing.
• The process may take several minutes depending on the computer and connection stability.
• If the status does not display FINISH, repeat the procedure carefully.

Conclusion

That’s the complete procedure for resolving the issue where the Nano Duo screen is stuck displaying the LONGER logo. The success of this process mainly depends on accurate parameter configuration and following the flashing steps in the correct order. As long as each setting is verified carefully and the sequence is strictly followed, the firmware recovery can be completed smoothly and safely.

Engraving defects such as misalignment, distorted lines, and incomplete circles are common issues encountered during laser engraving. These problems are typically related to mechanical instability or improper motion control settings. This article outlines the root causes and provides practical solutions to restore engraving accuracy on Longer laser engravers.

1. Common Issues

Users may observe the following symptoms during operation:

• Engraved patterns appear offset or shifted
• Straight lines become wavy or uneven
• Circular shapes are not fully closed
• Repeated designs show inconsistent positioning

These issues indicate that the motion system is not operating with the required precision.

2. Mechanical Adjustment

2.1 Eccentric Nut Calibration

The eccentric nuts control the pressure between the rollers and the guide rails. Improper adjustment can lead to instability or excessive resistance.

If the nuts are too loose, the laser module may wobble during movement, causing misalignment. If they are too tight, movement becomes restricted and may introduce vibration.

Adjust the eccentric nuts so that the rollers maintain firm contact with the rails while still allowing smooth and consistent movement.

2.2 Timing Belt Tension

Timing belts play a critical role in motion accuracy. Insufficient tension can result in positioning errors and deformation of engraved shapes.

Check both X-axis and Y-axis belts and ensure they are properly tensioned. The belts should feel firm when pressed lightly, without noticeable slack. Avoid overtightening, as this may increase wear on motors and bearings.

2.3 Timing Pulley Alignment

Misaligned pulleys can cause the timing belt to rub against the pulley edges, leading to friction, noise, and unstable motion.

Ensure that the timing belts run parallel to the motion axis. Adjust the pulley position if necessary to eliminate lateral friction and ensure smooth transmission.

2.4 Fastener Inspection

Loose mechanical components are a major source of engraving inaccuracies.

Inspect and tighten all relevant screws and connections, including:

• X-axis timing pulley set screws
• Y-axis motor couplings
• Pulley mounting screws

All components should be securely fixed to prevent any movement during operation.

3. Software Optimization

Mechanical adjustments should be complemented by proper software configuration.

3.1 Overcut Setting in LightBurn

Incomplete circles or open paths are often caused by insufficient overlap between the start and end points of a path.

In LightBurn, the Overcut parameter can be used to extend the cutting path slightly beyond the endpoint.

Set the Overcut value to 0.3 mm in the Advanced settings. This ensures that closed shapes such as circles are fully completed without visible gaps.

4. Additional Recommendations

Regular maintenance is essential to maintain engraving accuracy over time.

• Keep guide rails clean and free of dust or debris
• Periodically check belt tension and component tightness
• Use appropriate speed and power settings for detailed work
• Perform routine calibration to ensure consistent performance

5. Conclusion

Engraving misalignment, warped lines, and incomplete circles are typically caused by mechanical looseness, improper belt tension, pulley misalignment, or incorrect software settings. By systematically inspecting and adjusting both hardware and software parameters, users can effectively eliminate these issues and achieve precise, high-quality engraving results with Longer laser engravers.

This guide explains how to optimize camera brightness on the Nano Duo system when using its visual alignment function. Proper camera exposure is essential for accurate positioning, clearer preview images, and improved engraving precision.

In some scenarios, the camera may appear too dark, making it difficult to clearly view the working area. This can be caused by automatic exposure settings or insufficient lighting conditions. To address this, you can disable auto exposure and further adjust the camera brightness using external tools.

Video Guide 1: Camera Auto Exposure Off Control Function Activation

The first step in improving camera brightness is to disable the automatic exposure function. Auto exposure can sometimes reduce image brightness too aggressively, especially in low-light environments.

In the following guide, you will learn how to:

• Access the camera control settings
• Turn off the auto exposure feature
• Manually adjust exposure to improve brightness
• Stabilize image output for better alignment accuracy

Video Guide 2: Using AMCap to Further Solve Dark Camera Lighting Issues

If disabling auto exposure does not fully resolve the issue, you can use AMCap to further enhance camera brightness and improve image visibility.

AMCap is a camera control software that allows you to fine-tune camera parameters such as brightness, contrast, and gain.

In this guide, you will learn how to:

• Connect the Nano Duo camera to AMCap
• Adjust brightness and gain settings
• Improve image clarity under low-light conditions
• Optimize camera output for better visual alignment

Conclusion

Camera brightness plays a critical role in achieving accurate engraving results with the Nano Duo system. When the camera image appears too dark, disabling auto exposure and manually adjusting brightness using AMCap are effective solutions.

By following the steps demonstrated in the two video guides, users can achieve:

• Clearer camera previews
• More accurate positioning
• Improved engraving precision

Regularly checking and optimizing camera settings will help ensure consistent performance and better overall results when using the Nano Duo system.

Vision Correction Function

Before using the visual function of the frame machine, you must complete a visual alignment process. First, mark the patterns ①②③④ on the engraving target, then take a photo with the camera, and sequentially mark these points on the image in order. Before starting, ensure that no other program is using the frame machine’s camera.

Precautions Before Operation

l Place the engraving paper in the working area. Recommended scale value: 95.

l When performing the visual calibration function, ensure that no other cameras are connected and that the machine’s camera is not in use.

l During visual calibration, do not move the machine or engraving paper, and ensure that all steps are completed in a single session.

l Each marker pattern supports only a single calibration. To perform visual calibration again, you need to engrave a new marker pattern.

l Before performing visual calibration, always reset the machine to prevent it from colliding with the frame during engraving.

l Ensure that the camera lens is perpendicular to the surface of the engraving object to prevent calibration deviations caused by angled views (use a spirit level).

l Adjust the camera to a working distance of 550 mm from the surface of the engraving object to ensure the field of view fully covers the entire machine.

l Ensure the surface of the engraving object is level to prevent calibration deviations caused by unevenness.

l Ensure the bracket is positioned at the center of the machine’s front crossbeam.

Precautions for the Longer B1 Machine

l When using the Longer B1 machine, adjust the canvas size to 430 mm × 430 mm

Modification method:

1. Click on the Serial Log

2. Enter $130=430 and $131=430 separately in the input box. After entering, send $130 and $131 until you see the Canvas update.

Engraving Mark Patterns

You will use your laser to engrave the target pattern on a piece of material and mark the center of the target.

Step 1

After connecting the frame machine, click the camera icon in the menu bar to enter the visual calibration page.

Before entering the visual calibration page, scale and move the canvas aside so that the entire canvas can be fully viewed when the visual function page opens.

Step 2

Enter appropriate speed and power settings to achieve moderate engraving without burning through. Adjust the scale value up or down so that the canvas can accommodate the marker pattern.

Step 3

Click the border preview button to display the marker pattern on the canvas without exceeding the canvas size.

Note: After modifying parameters such as speed, power, or scale, be sure to click the “Border Preview” button again to synchronize the marker pattern on the canvas.

Step 4

Start engraving. If the pattern is not clear enough, you can adjust the settings and run it again. Once the pattern is clearly visible and easy to view, click Next.

Capture Target Mark Image

During this process, you will capture the alignment image. You may need to wait a few seconds on this screen for the camera to successfully capture it.

When the machine’s camera is detected, click the Capture button. You should see the camera view displayed in the lower-left corner of the window, with all four target points visible. The captured image appears on the right, as shown. Click Next once all four target points are clearly visible in the captured image.

Mark the Target

In this step, you need to mark each target by double-clicking the center of each target in sequence.

Hold the spacebar to move the image with the mouse, and use the scroll wheel to zoom in or out to ensure precise clicking on the center. A red marker will appear each time you double-click. If a marker is placed incorrectly, click “Undo Marker” to delete it and try again. Double-clicks must follow the order indicated on the marker pattern (1, 2, 3, 4). Once all four target points are marked, click “Finish” to complete the process.

If the metal plate on your LONGER Nano Duo becomes bent or creased, replacing it can help restore proper structural alignment and machine stability. This guide explains the official replacement process step by step while adding beginner-friendly explanations, safety precautions, troubleshooting advice, and maintenance tips to help you complete the repair successfully.

Table of Contents

• What This Guide Covers
• Why This Process Matters
• Before You Start
  • Requirements
  • Precautions
• Step-by-Step Tutorial
  • Step 1: Remove the L-Shaped Support Frame
  • Step 2: Remove the Toothed Connector
  • Step 3: Remove the Damaged Metal Plate
  • Step 4: Install the New Metal Plate
  • Step 5: Reassemble the Components
• Common Problems and Solutions
• Tips for Better Results
• Frequently Asked Questions
• Final Thoughts

What This Guide Covers

This tutorial explains how to perform a Nano Duo Z-axis metal plate replacement using the official LONGER procedure.

Quick Answer

To replace the Nano Duo Z-axis metal plate:

1. Remove the L-shaped support frame.
2. Remove the toothed connector using a hex wrench.
3. Remove the positioning pieces and damaged metal plate.
4. Install the new metal plate.
5. Reassemble the toothed connector and support frame.

The metal plate is intentionally thin, so it may crease if external pressure is applied. Replacing it restores proper support and alignment.

Why This Process Matters

In the LONGER Nano Duo, the middle metal plate is designed to be thin so the L-shaped support frame can fit tightly against the column. While this design improves fitment, it also means the plate can crease if excessive pressure is applied.

A damaged or bent plate may lead to:

• Improper support frame alignment
• Reduced structural stability
• Difficulty securing components
• Uneven positioning during operation

Replacing the damaged plate helps maintain the machine’s intended structure and ensures components fit correctly.

Before You Start

Requirements

Before beginning the Nano Duo Z-axis metal plate replacement, prepare the following:

• Replacement metal plate
• Hex wrench
• Clean workspace
• Adequate lighting

Follow official machine specifications or instructions.

Precautions

Before disassembling the machine:

• Power off the Nano Duo completely.
• Disconnect the power cable.
• Work on a stable surface.
• Keep screws and small parts organized during removal.
• Avoid applying unnecessary force to surrounding components.

Because the replacement plate is thin, handle it carefully to avoid bending it during installation.

Step-by-Step Tutorial

Step 1: Remove the L-Shaped Support Frame

Action

Rotate the hand-tightening nut counterclockwise to remove the L-shaped support frame.

Expected Result

The L-shaped support frame should detach from the column, allowing access to the internal metal plate assembly.

Important Notes

• Turn the hand-tightening nut slowly to avoid stripping or damaging the threads.
• Place the removed support frame in a safe location to prevent scratches or deformation.
• If the frame feels stuck, do not force it. Carefully check whether the nut has been fully loosened.

Step 2: Remove the Toothed Connector

Action

Use a hex wrench to remove the four screws shown in the figure and take off the toothed connector.

Expected Result

The toothed connector should separate from the assembly once all four screws are removed.

Important Notes

• Keep all four screws together to avoid losing them.
• Loosen screws evenly instead of removing one completely before the others.
• Use the correct hex wrench size to avoid damaging the screw heads.

The toothed connector helps secure the assembly, so proper reinstallation later is important.

Step 3: Remove the Damaged Metal Plate

Action

Remove the positioning pieces at the top and bottom of the column and take out the damaged metal plate.

Expected Result

The creased or damaged metal plate should slide out from the column assembly.

Important Notes

• Observe the orientation of the positioning pieces before removal.
• Handle the positioning pieces carefully to avoid misplacement.
• If the damaged plate is bent severely, remove it slowly to avoid scratching nearby components.

At this stage, inspect the surrounding area for debris or dust buildup before installing the new plate.

Step 4: Install the New Metal Plate

Action

Place the new metal plate in position and reinstall the positioning pieces at the top and bottom of the column as shown in the figure.

Expected Result

The replacement metal plate should sit securely in the correct position inside the column assembly.

Important Notes

• Ensure the metal plate sits flat and aligned properly.
• Reinstall the positioning pieces in their original locations.
• Do not bend the new plate during installation.

If the plate does not fit smoothly, stop and verify orientation before continuing.

Step 5: Reassemble the Components

Action

Use the hex wrench to tighten the screws to secure the toothed connector, then reinstall the L-shaped support frame. The metal plate replacement is now complete.

Expected Result

The Nano Duo assembly should be fully reassembled with the new metal plate securely installed.

Important Notes

• Tighten the screws evenly for balanced pressure.
• Avoid overtightening.
• Confirm the L-shaped support frame fits tightly against the column.

After reassembly, visually inspect the machine to ensure all parts are correctly seated.

Common Problems and Solutions

Tips for Better Results

• Work slowly during disassembly and reassembly.
• Take photos before removing components if you are a beginner.
• Keep the work area clean to prevent losing small parts.
• Avoid placing heavy objects on the Nano Duo column assembly.
• Inspect the metal plate periodically if the machine is transported frequently.
• Use proper tools to reduce the risk of stripped screws.

Regular maintenance can help extend the lifespan of your LONGER Nano Duo and reduce future repair needs.

Frequently Asked Questions

1. Why does the Nano Duo metal plate crease easily?

The metal plate is intentionally designed to be thin so the L-shaped support frame can fit tightly against the column. Because of this design, the plate may crease if external pressure is applied.

2. Do I need special tools for this repair?

The official procedure mentions using a hex wrench. Follow official machine specifications or instructions for compatible tool sizes.

3. Can I continue using the Nano Duo with a bent metal plate?

A creased plate may affect fitment and alignment. Replacing the damaged plate is recommended to maintain proper assembly stability.

4. How long does the replacement process take?

The official guide does not specify a repair time. The process is relatively straightforward, but beginners should work carefully and allow extra time.

5. What should I do if the toothed connector does not align correctly?

Check whether the new metal plate and positioning pieces are installed correctly before tightening the screws.

6. Can overtightening damage the assembly?

Yes. Applying excessive force may damage screws or deform components. Tighten screws securely but carefully.

7. Where can I find official Nano Duo resources?

LONGER provides official Nano Duo downloads, manuals, firmware, and troubleshooting resources on its support pages. LONGER Nano Duo Support Center

Final Thoughts

Replacing the Nano Duo Z-axis metal plate is a straightforward maintenance procedure when performed carefully and in the correct order. By following the official LONGER process, you can restore proper support frame alignment and maintain the structural stability of your laser engraver.

Always handle the replacement plate gently during installation, keep hardware organized, and follow official machine instructions whenever additional specifications are required. Proper maintenance and careful handling can help prevent future damage and keep your LONGER Nano Duo operating smoothly.

If wavy traces appear during border tracing on the Nano Duo, the issue is caused by outdated firmware. Updating the firmware can resolve the problem and restore smooth, accurate tracing performance.

This guide walks you through the official firmware update process step by step while also providing beginner-friendly explanations, troubleshooting advice, and safety tips.

Table of Contents

1. What This Guide Covers
2. Quick Answer
3. Why This Process Matters
4. Before You Start
5. Requirements
6. Precautions
7. Step-by-Step Tutorial
8. Common Problems and Solutions
9. Tips for Better Results
10. Frequently Asked Questions
11. Final Thoughts

What This Guide Covers

This tutorial explains:

• Why wavy traces appear during border tracing
• How to update Nano Duo firmware correctly
• How to use the SD card firmware upgrade process
• What the firmware upgrade options mean
• Common firmware update troubleshooting methods

Quick Answer

If your Nano Duo creates wavy traces during border tracing, update the firmware using an SD card.

The basic process is:

1. Download the latest firmware from the official website
2. Save the firmware to the SD card
3. Insert the SD card into the Nano Duo
4. Open the Settings menu
5. Enter Firmware Update
6. Select the component upgrade option

This resolves border tracing issues caused by old firmware versions.

Why This Process Matters

Firmware controls the internal operation of the Nano Duo machine, including motion control, galvo performance, and screen communication.

When the firmware becomes outdated, users may experience:

• Wavy border tracing
• Inaccurate movement
• Irregular engraving paths
• Reduced tracing precision

Updating the firmware helps improve machine stability and ensures the Nano Duo operates with the latest optimizations and fixes.

Before You Start

Firmware updates are important system-level operations. Before beginning, make sure the machine is powered properly and avoid interrupting the upgrade process.

A failed firmware update caused by power loss or SD card issues may prevent the machine from operating correctly.

Requirements

Before updating the Nano Duo firmware, prepare the following:

• Nano Duo laser engraver
• SD card
• Latest firmware downloaded from the official website
• Stable power connection
• Access to the machine touchscreen interface

Precautions

Before starting the firmware update process, follow these precautions carefully:

• Do not remove the SD card during the update
• Do not power off the machine during firmware installation
• Ensure the firmware file is fully downloaded before copying it to the SD card
• Use a properly functioning SD card
• Keep the machine connected to stable power throughout the process
• Follow official machine specifications or instructions

Step-by-Step Tutorial

Step 1: Download the Latest Firmware and Insert the SD Card

Action

Download the latest firmware from the official website and save it to the SD card.
Turn on the machine and insert the SD card into the slot on the side of the machine. When an upward arrow and the word “SD” appear on the main interface, it means the file has been successfully read.

Expected Result

The Nano Duo detects the SD card and recognizes the firmware files successfully.

Important Notes

• If the SD icon does not appear, reinsert the SD card carefully
• Ensure the firmware files were copied correctly to the SD card
• Avoid removing the SD card once detected by the machine

Step 2: Enter the Settings Screen

Action

On the main interface, tap the “Settings” option to enter the settings screen, which includes basic settings such as network, language, etc.

Expected Result

The settings menu opens successfully, allowing access to firmware management features.

Important Notes

• Navigate carefully through the touchscreen interface
• Do not modify unrelated settings unless necessary

Step 3: Open the Firmware Update Screen

Action

Tap the “Firmware update” option to enter the upgrade screen, then tap the upward arrow button to start the component upgrade.

Expected Result

The firmware upgrade interface appears and the machine begins preparing the selected component update.

Important Notes

• Ensure the SD card remains inserted during the process
• Wait patiently while the system reads the upgrade files

Step 4: Select the Firmware Component to Upgrade

Action

“Screen” represents the screen component upgrade, “Galvo” represents the galvo component upgrade, and “Main Control” represents the main control component upgrade. Select the component you want to upgrade to proceed.

Expected Result

The selected firmware component begins upgrading successfully.

Important Notes

• Upgrade the correct component based on the firmware package
• Do not interrupt the machine while upgrading
• The upgrade process may take several minutes depending on the component

Important Note About Retrieval Failed Message

Note

When there are no new firmware components on the SD card, the screen will display “Retrieval failed.”

Explanation

This message usually means:

• The firmware file is missing
• The wrong firmware version was copied
• The SD card was not prepared correctly
• No new upgrade package exists on the card

Verify the firmware files and try again if necessary.

Common Problems and Solutions

Tips for Better Results

• Use a reliable SD card with stable read performance
• Keep backup copies of firmware files on your computer
• Perform firmware updates in a stable environment without power interruptions
• Update all required components if recommended by official instructions
• Restart the machine after completing the upgrade process
• Regularly check for official firmware updates to improve performance and stability

Frequently Asked Questions

Q1: Why does my Nano Duo create wavy border traces?

Wavy traces are usually caused by outdated firmware affecting motion or galvo control performance. Updating the firmware resolves this issue.

Q2: What does the “SD” icon mean on the main interface?

The upward arrow and “SD” indicator mean the Nano Duo successfully detected and read the firmware files from the SD card.

Q3: What should I do if “Retrieval failed” appears?

This means the machine cannot find valid firmware files on the SD card. Recheck the firmware package and copy the correct files again.

Q4: Can I remove the SD card during the firmware update?

No. Removing the SD card during the upgrade may interrupt the process and cause firmware installation failure.

Q5: What does “Galvo” mean in the firmware update menu?

“Galvo” refers to the galvo component upgrade, which controls laser scanning movement and positioning accuracy.

Q6: Is it necessary to update all components?

Only update the components required by the firmware package or official instructions. Follow official machine specifications or instructions.

Q7: How long does the firmware update take?

The update duration varies depending on the component being upgraded. Wait until the process completes fully before operating the machine.

Final Thoughts

Updating the Nano Duo firmware is the official solution for fixing wavy traces during border tracing. By carefully following the firmware upgrade process using the SD card method, you can improve tracing accuracy and restore smooth machine operation.

Always follow the official firmware instructions, keep the machine powered during updates, and avoid interrupting the installation process for the best results.

Nano DUO is equipped with a built-in screen that allows users to perform basic machine operations directly from the device. One of the most important functions is switching between the 450 nm Blue Laser and the 1064nm Infrared Laser directly through the screen interface. This guide preserves the original operation sequence exactly while providing beginner-friendly explanations, safety tips, troubleshooting advice, and practical guidance for daily use.

Table of Contents

1. What This Guide Covers
2. Quick Answer
3. Why This Process Matters
4. Before You Start
   • Requirements
   • Precautions
5. Step-by-Step Tutorial
6. Common Problems and Solutions
7. Tips for Better Results
8. Frequently Asked Questions
9. Final Thoughts

What This Guide Covers

This tutorial explains:

• How to switch between the red and blue lasers on Nano DUO
• How to use the built-in screen correctly
• How to select the correct Light Source setting
• Important compatibility notes for LightBurn and LaserGRBL
• Common issues during laser switching

This article keeps the original tutorial steps, menu names, and settings unchanged.

Quick Answer

To switch between red and blue lasers on Nano DUO using the screen:

1. Tap File scanning and select the engraving file.
2. In Light Source, tap the dropdown menu.
3. Select:
   • 450 nm [Blue Laser]
   • or 1064nm [Infrared Laser]

Important:

• Make sure the SD card is inserted into the slot.
• Only files generated by LightBurn and LaserGRBL support red and blue laser switching.
• Files generated by LaserBurn integrate dual-laser commands into the *.gc file, so the light source cannot be changed through the screen.

Why This Process Matters

The Nano DUO supports dual-laser operation, allowing users to work with different materials and engraving effects using separate laser wavelengths.

The two laser options serve different purposes:

• 450 nm [Blue Laser]
  • Commonly used for wood, leather, coated metals, cardboard, acrylic, and many engraving materials.
• 1064nm [Infrared Laser]
  • Typically used for certain metal marking applications and specialized engraving tasks.

Correctly selecting the laser source ensures:

• Proper engraving results
• Better material compatibility
• Reduced engraving errors
• Stable machine operation
• Safer workflow

Using the wrong laser source may lead to weak engraving results, poor marking quality, or failed engraving jobs.

Before You Start

Requirements

Before switching lasers on Nano DUO, prepare the following:

• Nano DUO laser engraver
• Properly inserted SD card
• Engraving file generated by:
  • LightBurn
  • or LaserGRBL
• Connected and powered-on machine
• Proper laser safety glasses

Follow official machine specifications or instructions.

Precautions

Before operating the machine:

• Always wear laser safety protection.
• Ensure the work area is clean and ventilated.
• Never look directly at the laser beam.
• Confirm the engraving file is compatible with the selected laser source.
• Do not remove the SD card while reading files.
• Avoid changing settings during active engraving.

Important:

Only files generated by LightBurn and LaserGRBL support red and blue laser switching through the screen.

Files generated by LaserBurn contain integrated dual-laser commands inside the *.gc file. In this case, the light source cannot be changed from the Nano DUO screen.

Step-by-Step Tutorial

Step 1: Tap File scanning and select the desired engraving file

Action

On the Nano DUO screen:

1. Tap File scanning
2. Select the desired engraving file

Expected Result

The machine loads the selected engraving file from the SD card and prepares it for processing.

Important Notes

Make sure the SD card is inserted into the slot.

If the SD card is missing or not recognized:

• The file list may not appear
• The machine may fail to load engraving files
• The screen may display no available files

For best compatibility:

• Ensure the SD card is functioning correctly
• Use properly exported engraving files
• Avoid removing the SD card during operation

Follow official machine specifications or instructions.

Step 2: In Light Source, tap the dropdown menu and select:

450 nm [Blue Laser]

or 1064nm [Infrared Laser]

Action

Locate the Light Source option on the screen.

Tap the dropdown menu and select one of the following:

• 450 nm [Blue Laser]
• 1064nm [Infrared Laser]

Expected Result

The Nano DUO changes the active laser source based on your selection.

The machine is now configured to engrave using the chosen laser type.

Important Notes

Only files generated by LightBurn and LaserGRBL support red and blue laser switching.

Since LaserBurn integrates commands that enable simultaneous dual-laser engraving into the *.gc file, the light source cannot be changed through the screen.

This is an important compatibility limitation that beginners often overlook.

If the dropdown menu does not allow switching:

• Verify the file source
• Check whether the file was generated in LaserBurn
• Re-export the file if necessary

Do not modify unsupported files manually.

Common Problems and Solutions

Tips for Better Results

Use Compatible Software

For screen-based laser switching, use:

• LightBurn
• LaserGRBL

These programs support Nano DUO laser source switching properly.

Verify the Laser Before Starting

Always confirm the selected Light Source before engraving.

This helps prevent:

• Incorrect engraving results
• Material damage
• Failed projects

Keep the SD Card Stable

Avoid:

• Removing the SD card during operation
• Using damaged SD cards
• Using corrupted engraving files

Organize Your Files Clearly

Use clear filenames when exporting projects.

This makes it easier to identify:

• Blue laser projects
• Infrared laser projects
• Material-specific settings

Test Small Samples First

Before engraving expensive materials:

• Run a small test pattern
• Verify the selected laser source
• Confirm engraving quality

Frequently Asked Questions

1. Can I switch between lasers directly on the Nano DUO screen?

Yes. Nano DUO includes a built-in screen that allows switching between:

• 450 nm [Blue Laser]
• 1064nm [Infrared Laser]

2. Which software supports laser switching through the screen?

Only files generated by:

• LightBurn
• LaserGRBL

support switching lasers through the screen.

3. Why can’t I change the Light Source option?

If the file was generated by LaserBurn, the *.gc file already contains integrated dual-laser commands.

In this case, the light source cannot be changed through the screen.

4. What does 450 nm [Blue Laser] mean?

450 nm refers to the wavelength of the Blue Laser module used by Nano DUO.

5. What does 1064nm [Infrared Laser] mean?

1064nm refers to the Infrared Laser wavelength supported by Nano DUO.

6. Why is my SD card not showing files?

Possible reasons include:

• SD card not inserted properly
• Unsupported formatting
• Corrupted files
• Damaged SD card

Follow official machine specifications or instructions.

7. Is it safe to switch lasers during engraving?

Do not change laser settings during active engraving.

Always configure the Light Source before starting the job.

Final Thoughts

Switching between red and blue lasers on Nano DUO using the built-in screen is a straightforward process when the correct workflow is followed. The key points are inserting the SD card correctly, selecting the engraving file through File scanning, and choosing the proper Light Source option.

Most importantly, remember that only LightBurn and LaserGRBL generated files support screen-based laser switching. Files created in LaserBurn already contain integrated dual-laser commands inside the *.gc file, preventing manual switching from the screen.

By following the original operation sequence exactly and understanding the compatibility limitations, beginners can safely and efficiently use both laser modes on Nano DUO.

Proper control of the LED light on the Nano Duo laser engraver is important for improving visibility, ensuring accurate camera alignment, and enhancing the overall engraving experience. The LED lighting helps illuminate the working area, making it easier to position materials and monitor the engraving process.

The Nano Duo system provides multiple methods to control the LED light depending on the software you are using. Below are the detailed instructions for each supported platform.

1. LightBurn

After successfully connecting Nano Duo to LightBurn, you can control the LED light through the console by sending G-code commands.

Open the console input box and enter the following commands, then press Enter to execute:

$nano/led=off 【Turn off LED】
$nano/led=on 【Turn on LED】

These commands allow direct control over the LED light. Turning off the LED can be useful when working with reflective materials or when reducing ambient interference during engraving. Turning it on helps improve visibility when positioning materials or previewing the work area.

Make sure the device is properly connected before sending commands to avoid communication errors.

2. LaserGRBL

LaserGRBL also supports LED light control using the same command-based method.

After successfully connecting Nano Duo, open the console input box and enter the following commands:

$nano/led=off 【Turn off LED】
$nano/led=on 【Turn on LED】

Press Enter after inputting each command to send it to the device.

This method is particularly useful for users who prefer a lightweight control interface or who are working in a GRBL-based workflow. The LED can be toggled at any time during setup or operation, allowing flexible adjustment based on lighting conditions.

3. LaserBurn PC

In LaserBurn PC software, LED control is integrated into the control interface, allowing for more intuitive operation without manually entering commands.

On the control page, locate and click the Engraving section. You will find an LED Light button that allows you to directly turn the LED light on or off.

This provides a convenient way to control lighting during setup or engraving without needing to use console commands.

Additionally, you can access advanced control options through the top menu. Click the menu button to open the command input window. In this window, you can enter the following commands and click Send to execute:

$nano/led=off 【Turn off LED】
$nano/led=on 【Turn on LED】

This method combines both manual command input and graphical control, giving users more flexibility depending on their workflow preferences.

Conclusion

The Nano Duo LED light can be controlled through multiple software platforms, including LightBurn, LaserGRBL, and LaserBurn PC. Whether using direct console commands or built-in interface controls, users can easily switch the LED light on or off based on their needs.

Proper LED control improves visibility, enhances camera alignment, and contributes to more accurate engraving results. By understanding and using these control methods, users can optimize their working environment and achieve better engraving performance.

Nano Duo is designed as a high-speed engraving system. However, engraving lag may occur when the data transmission speed from the software to the machine cannot keep up with the engraving speed. This can result in delays, pauses, or uneven engraving performance.

To ensure smooth operation, it is important to optimize data transmission efficiency and reduce communication bottlenecks. One of the most effective solutions is enabling G-code clustering within the software.

It is important to note that engraving via SD card does not rely on real-time data transmission from the computer. As a result, this method does not experience lag and is recommended for high-speed or complex engraving tasks.

1. LightBurn

Click the button in the top menu bar, enable the Enable GCode Clustering option, and click OK.

2. LaserBurn PC

Click the button in the top menu bar to open the Machine Settings interface, enable the Enable GCode Clustering option, and click Save.

Conclusion

Engraving lag on Nano Duo is typically caused by limitations in real-time data transmission rather than hardware performance issues. By enabling G-code clustering in supported software such as LightBurn and LaserBurn PC, users can significantly improve data flow efficiency and reduce or eliminate lag.

For the best results, it is also recommended to use SD card engraving when working with high-speed or complex designs, as it ensures stable and uninterrupted operation. By applying these optimizations, users can achieve smoother engraving performance and more consistent output quality.

During engraving, a sudden stop can interrupt the workflow and affect the final output quality. On Nano Duo, this issue is typically related to either data communication problems or safety-triggered machine alarms. Understanding the root cause is essential for quickly restoring normal operation.

1. Data Loss or Connection Interruption

When Nano Duo is connected via a data cable, stable communication between the computer and the machine is required throughout the engraving process. If this connection is interrupted, the machine may stop immediately.

Common causes include:

• Loose or improperly connected USB port
• Damaged or low-quality data cable
• Interference in the communication line

If any of these issues occur, the data transmission may be interrupted, causing the engraving process to stop.

To resolve this issue:

• Ensure the data cable is securely connected on both ends
• Replace the cable with a high-quality or new one if necessary
• Avoid moving or disturbing the cable during operation

Using a stable and reliable connection is critical for uninterrupted engraving, especially during long or complex jobs.

2. Machine Alarm Triggered

Nano Duo is equipped with safety protection features that will automatically stop the machine if abnormal movement is detected.

If the machine experiences shaking, tilting, or unexpected motion during engraving, the system will trigger an alarm. When this happens:

• The machine will stop immediately
• The red indicator light will turn on
• The system enters an alarm state to prevent further issues

This is a protective mechanism designed to ensure user safety and prevent damage to the machine or workpiece.

How to Recover from an Alarm

Once the cause of the alarm is removed and the machine is stabilized, engraving can resume normally.

If the alarm does not clear automatically, follow these steps:

Connect the Nano Duo to a computer
Open LightBurn or LaserBurn software
Open the console input window
Enter the command:

$X

Press Enter to send the command and clear the alarm state.

After the alarm is cleared, the machine will return to normal operation and can continue engraving.

Conclusion

A sudden stop during engraving on Nano Duo is usually caused by either a loss of data connection or a machine-triggered alarm due to instability. By ensuring a stable cable connection and maintaining a secure working environment, users can significantly reduce the likelihood of interruptions.

In the event of an alarm, clearing it using the $X command restores normal operation quickly. Proper handling of these situations helps maintain smooth engraving performance and ensures consistent output quality.