Lasergravierer-Blog

A UV printer is a high-precision digital printing device that utilizes ultraviolet (UV) light to instantly cure specialized UV inks, thereby enabling the creation of high-precision, durable, and customizable images on material surfaces. Unlike traditional inkjet or screen printing methods—which rely on the natural drying of ink—UV printing technology allows ink droplets to cure the very moment they make contact with the material surface, thereby achieving highly efficient printing with virtually zero waiting time. It can be widely applied to the surfaces of glass, wood, metal, plastics, leather, acrylic, and various other rigid or flexible materials.

Desktop UV Printer is a high-precision digital printing device that uses ultraviolet (UV) light to instantly cure specially formulated UV ink, enabling durable, high-resolution, and customizable graphics to be printed directly onto material surfaces.

1. UV Printer Working Principle

UV printing works by combining digital inkjet printing with UV curing technology. The printing process involves the coordinated operation of several critical components.

1.1 UV Ink System

UV ink contains photoinitiators, resins, pigments, and other functional additives. When the ink is exposed to ultraviolet light, the photoinitiators absorb the energy and start a chemical reaction. This reaction quickly hardens the liquid ink, forming a solid layer on the material surface.

Key components include:

• Photoinitiators: Photoinitiators take in UV energy and produce free radicals. These radicals start a chemical reaction that cures the ink, usually in acrylate or epoxy-based resins.
• Resin Matrix: The resin binder gives the printed layer adhesion, flexibility, and durability. Acrylate resins are often used because their hardness and elasticity can be easily adjusted.
• Pigments and Dispersants: Pigments give the ink vibrant colors. Dispersants keep the pigments evenly distributed, allowing the printer to produce fine details.
• Additives: Reduces surface tension, improves leveling, and enhances adhesion and light resistance.

1.2 High-Precision Printhead Technology

UV printers typically use piezoelectric printheads (such as those in the Epson or Ricoh series). Their operating principle involves generating pressure via piezoelectric ceramic elements to precisely eject ink droplets onto the surface of the material. These capabilities are widely implemented in both industrial flatbed UV printer systems and compact Desktop UV Printer solutions.

Key features include:

• Micro-Droplet Control: Ink droplets can be as small as 1–5 picoliters, enabling extremely high resolution and fine detail reproduction.
• High Jetting Frequency: High-frequency droplet ejection allows printers to maintain both printing speed and image precision.
• Variable Droplet Technology: Advanced printheads can produce droplets of varying volumes, enabling smooth color gradients and extended dynamic color range.

1.3 UV Curing System

The curing system is a critical part of any UV printer. It typically uses UV LED lamps or mercury vapor lamps that emit ultraviolet light at specific wavelengths, such as 365 nm, 385 nm, or 405 nm.

Key mechanisms include:

• Photopolymerization Reaction: UV light excites the photoinitiators and generates free radicals. These radicals start a rapid cross-linking reaction in the resin monomers, forming a hard and durable ink layer.
• Instant Curing Advantage: The ink cures within 0.1 to 1 second after it touches the substrate. Because the reaction is so fast, the ink does not spread. This helps maintain sharp edges and high printing accuracy.
• Uniform UV Intensity: Even UV light distribution helps maintain consistent color saturation. It also prevents printing defects caused by uneven or insufficient curing.

1.4 Substrate Positioning and Platform System in UV Printers

The accuracy of the printing platform plays an important role in overall print quality.

• Vacuum Suction Platform: A vacuum table secures substrates of different shapes and sizes, preventing movement during printing.
• Three-Axis Motion System: High-precision motion systems control movement along the X, Y, and Z axes, enabling micron-level positioning accuracy and supporting multi-layer printing.

This architecture is commonly used in flatbed UV printer designs, while smaller Desktop UV Printer models integrate compact versions of these positioning systems.

1.5 Control System and RIP Software

The Raster Image Processor (RIP) software serves as the "brain" of UV printing, translating design files into executable printing instructions.

Its main functions include:

• Color Management: Performs color separation and ICC profile calibration to ensure that printed colors precisely match the original design.
• Image Processing: Supports gradients, halftone processing, transparency control, and layered texture planning.
• Motion Control: Synchronizes the firing of the print heads with the UV lamp curing process to achieve continuous and precise print output.

2. UV Printing Workflow

The UV printing process typically consists of several sequential stages.

• Design and Image Processing: Import JPG, PNG, PSD, or vector files into the operating software; adjust dimensions, resolution, and color levels; and generate color separations, embossing effects, and transparency effects.
• Material Preparation and Positioning: Depending on the material type, perform surface cleaning or pre-treatment (e.g., degreasing or dust removal), and secure the material using vacuum suction or fixtures.
• Precision Inkjet Printing: The printhead deposits micro-droplets of UV ink onto the substrate surface according to the digital image data.
• Instant UV Curing: UV lamps irradiate the ink to achieve instantaneous curing, forming a stable ink layer with strong adhesion.
• Multi-Layer Printing: For 3D textures, embossed patterns, or relief structures, the process of ink deposition followed by UV curing can be repeated multiple times to build up thickness and create tactile effects.
• Post-Processing and Inspection: After printing, additional finishing steps may include protective coatings or light polishing. Quality checks are performed to evaluate adhesion strength, color saturation, and scratch resistance.

3. Technical Advantages of UV Printing

• Broad Material Compatibility: A UV printer can print directly on a wide range of materials including glass, metal, wood, plastic, leather, and acrylic, in most cases without requiring primers or additional surface treatments.
• High-Resolution Detail: Supports resolutions of 1440 DPI and higher, enabling the precise rendering of fine text, color gradients, and intricate patterns.
• Instant Curing and High Productivity: Because UV ink cures immediately, there is no drying time, greatly improving production efficiency and making UV printing suitable for both small-batch customization and large-scale manufacturing.
• Excellent Durability: The ink layer is scratch-resistant, waterproof, and UV-resistant, ensuring long-term usability in both indoor and outdoor environments.
• Environmental Benefits: UV inks typically produce low volatile organic compound (VOC) emissions, and the curing process generates minimal harmful gases, supporting environmentally responsible manufacturing.
• Expandable Printing Capabilities: Multi-layer printing allows 3D embossing, spot varnish effects, localized thickening, transparent coatings, and matte textures, expanding UV printing beyond traditional flat graphics.

4. Applications and Future Development Trends of UV Printing

UV printing technology is widely applied across numerous high-precision printing sectors.

• Personalized Customization: Compact Desktop UV Printer systems are commonly used to produce custom phone cases, notebooks, promotional gifts, and handcrafted products.
• Industrial Manufacturing: Flatbed UV printers are used to produce equipment nameplates, control panels, industrial labels, signage systems, and packaging components.
• Creative & Artistic Sector: UV printing enables artwork reproduction, layered textures, and customized interior decorations.
• Functional Printing: UV printers can produce markings with high temperature resistance, chemical resistance, or anti-counterfeiting security features, making them valuable for industrial and security applications.

5. Conclusion

Through the integration of precision inkjet technology, instant UV curing, and multi-layer printing capabilities, UV printing continues to push the boundaries of materials and manufacturing processes.

From flat graphics to three-dimensional textures, and from standard color printing to advanced surface effects, modern UV printers, ranging from industrial flatbed systems to compact desktop solutions, provide powerful tools for industrial production, personalized manufacturing, and high-precision digital printing.

As these technologies continue to evolve, UV printing is driving the digital printing industry into a new era of innovation, efficiency, and creative possibility. For creators and small businesses looking to take advantage of these advancements, Longer ePrint UV Printer offers a practical and powerful entry point, combining dual-head efficiency, high-resolution output, and the flexibility to print on a wide range of materials in a compact desktop format.

By choosing a solution designed for both performance and versatility, users can more easily turn creative ideas into high-quality finished products while scaling their production with confidence.

UV printing technology has become increasingly popular among small businesses, makers, and home studios. Compact UV printers now allow users to print directly onto materials such as wood, metal, acrylic, plastic, leather, and fabric. However, one issue that many new users underestimate is temperature management, especially during the winter months.

UV inks are chemically engineered materials. When exposed to low temperatures, they can become unstable, which may affect printhead performance, droplet consistency, and overall print quality.

After years working in UV printer development and testing—including compact systems designed for creators and small workshops—I’ve seen many printing issues that were ultimately traced back to improper ink storage during cold weather.

In this guide, we will cover:

• How cold temperatures affect UV ink

• Proper UV ink storage during winter

• Transportation precautions

• Inspection steps after delivery

• Preparation tips before printing

We will also explain how modern printers such as Longer ePrint UV printer help mitigate these issues with built-in ink temperature control systems.

1. Why Temperature Matters for UV Ink?

UV ink is composed of several sensitive chemical components, including:

• Pigments

• Photoinitiators

• Oligomers

• Monomers

• Stabilizers

These ingredients are formulated to work together within a specific temperature and viscosity range. When temperatures drop too low, several problems may occur:

• Ink viscosity increases

• Pigment particles may settle

• Droplet formation becomes inconsistent

• Nozzle clogging becomes more likely

In our internal testing labs, we once evaluated ink stored overnight in a warehouse that dropped to around 3°C (37°F). The ink had not frozen, but viscosity increased enough to cause intermittent jetting instability and color inconsistency during printing.

After allowing the ink to return to room temperature for several hours, the printer resumed normal operation. This example highlights how temperature management directly affects printing reliability.

2. UV Ink Storage Guidelines in Winter

2.1 Maintain a Safe Temperature Range

Most UV ink manufacturers recommend storing ink between: 5°C and 25°C (41°F – 77°F). This temperature range keeps the ink chemically stable and ensures proper viscosity. Recommended storage practices include:

• Store ink indoors

• Keep ink in temperature-controlled environments

• Avoid garages, sheds, or outdoor storage

• Never leave ink in vehicles overnight during winter

When temperatures fall below 0°C (32°F), UV ink may partially freeze or thicken significantly. This can disrupt pigment dispersion and affect long-term print quality.

2.2Keep Ink Bottles Sealed and Protected from Light

UV inks contain photoinitiators, which react when exposed to ultraviolet light. For this reason, ink bottles should always be:

• Tightly sealed after use

• Stored in shaded or dark environments

• Protected from prolonged light exposure

Air exposure can also cause gradual evaporation or contamination, which may reduce ink stability over time. Professional print shops often store UV ink inside opaque storage cabinets to minimize environmental exposure. 

2.3 Avoid Repeated Freeze–Thaw Cycles

Repeated freezing and thawing is one of the most damaging conditions for UV ink. Multiple freeze-thaw cycles can cause:

• Pigment separation

• Breakdown of dispersant chemistry

• Permanent viscosity changes

In real printing environments, this often results in:

• Unstable ink jetting

• Inconsistent color output

• Increased risk of nozzle clogging

If ink has frozen, it should be carefully inspected before use.

3. Winter Transportation Tips for UV Ink

Shipping UV ink in cold climates presents additional challenges. Ink packages may pass through unheated trucks or warehouses, exposing them to freezing temperatures for extended periods.

3.1 Use Insulated Packaging

For winter shipping, it is recommended to use:

• Insulated boxes

• Thermal liners

• Foam padding

• Insulated packing materials

Some suppliers also include heat packs inside the package to help maintain internal temperature. One important note should be noted, heat packs should not directly touch the ink bottles, as localized heat may degrade the ink.

3.2 Reduce Shipping Time

The longer UV ink remains in transit during winter, the higher the risk of temperature exposure. To reduce this risk:

• Choose faster shipping services

• Avoid weekend shipping delays

• Minimize warehouse transfer time

In several field cases we studied, ink shipments delayed over winter weekends were more likely to arrive partially frozen.

3.3 Label Packages as Temperature  Sensitive

Shipping labels such as the following can help alert logistics staff:

• “Temperature Sensitive”

• “Protect From Freezing”

• “Handle With Care”

Although not all shipping systems are temperature controlled, these labels improve handling awareness.

4. Inspecting UV Ink After Winter Delivery

When receiving UV ink during winter, users should perform a quick inspection before storage or installation.

4.1 Visual Inspection

Check the ink bottle for the following conditions:

• Signs of freezing or solidification

• Bottle deformation or swelling

• Leakage or damage

• Visible separation or sediment

If the ink appears frozen or damaged, contact the supplier before using it.

4.2 Controlled Thawing

If ink arrives extremely cold or partially frozen, allow it to warm gradually. A safe method is to place the sealed bottle in warm (not hot) water for a short period. Avoid high heat, which may alter the chemical composition of the ink. After thawing, gently shake the bottle and observe:

• Pigment distribution

• Color consistency

• Texture

If separation remains or sediment cannot be mixed back into the ink, it should not be used.

5. Preparing UV Ink Before Printing

5.1 Allow Ink to Reach Room Temperature

Before installing UV ink in a printer, allow it to sit at approximately: 20°C – 28°C (68°F – 82°F) for around 6–12 hours. This ensures the ink returns to its ideal viscosity for stable droplet formation.

5.2 Maintain Stable Printer Temperature

Cold environments can also affect the printer itself. If printing in garages, basements, or workshops during winter, maintaining stable ambient temperatures can reduce:

• Nozzle clogging

• Ink flow issues

• Inconsistent curing

Many modern desktop UV printers now integrate ink heating systems for this purpose.

6. How the Longer ePrint UV Printer Helps Maintain Stable Ink Performance?

Modern compact desktop UV printers increasingly include features designed to improve reliability in non-industrial environments. Longer ePrint UV printer incorporates an automatic printhead heating system designed to maintain optimal ink viscosity.

The system operates within the following range:

• Heating begins when temperature drops below 25°C

• Heating stops when temperature reaches 30°C

This automatic regulation helps maintain stable ink flow and improves:

• Droplet consistency

• Printhead reliability

• Long-term print quality

For creators and small businesses working from home studios, workshops, or small production spaces, this feature significantly reduces the risk of cold-weather printing issues.

Combined with its dual-printhead architecture, 1440 DPI resolution, and compatibility with over 300 materials, the Longer ePrint provides a stable and versatile UV printing solution for both personal and commercial applications.

7. Winter UV Printer Maintenance Checklist

To keep your Desktop UV printer running reliably during winter, follow this simple checklist:

• Store UV ink between 5°C and 25°C
• Avoid freezing conditions
• Use insulated packaging for winter shipping
• Inspect ink immediately after delivery
• Allow ink to warm to room temperature before printing
• Maintain stable printer operating temperatures
• Use printers with ink heating systems when possible

Following these steps can significantly reduce printing problems and extend both ink life and printer lifespan.

8. FAQ About UV Ink Storage in Winter

Can UV ink freeze?

Yes. If exposed to temperatures below 0°C (32°F), UV ink may partially or fully freeze. Freezing can damage the internal pigment dispersion and affect printing performance.

Can frozen UV ink still be used?

Sometimes. If the ink is thawed slowly and returns to a normal appearance without separation, it may still function properly. However, severely frozen ink should be replaced.

What temperature should UV ink be before printing?

UV ink should ideally be between 20°C and 28°C (68°F – 82°F) before printing to ensure proper viscosity and stable droplet formation.

Do modern Desktop UV printers help manage ink temperature?

Yes. Some modern compact Desktop UV printers include ink heating systems to stabilize viscosity. For example, the Longer ePrint UV printer automatically warms ink when temperatures fall below 25°C, helping maintain consistent print performance.

Conclusion

Winter conditions can introduce challenges for desktop UV printing, particularly when it comes to ink storage and transportation. Fortunately, most problems can be avoided through proper handling practices and by using printers designed with temperature stability in mind.

By storing ink correctly, inspecting shipments carefully, and maintaining proper operating temperatures, users can ensure consistent printing performance throughout the colder months.

For creators, makers, and small business owners looking for a more reliable solution, choosing a machine built with stability and efficiency in mind can make all the difference. Longer ePrint UV Printer is designed to deliver consistent output across a wide range of environments, helping reduce common issues caused by temperature fluctuations while improving overall productivity with its dual-head efficiency.

For many users entering the UV printing space, combining the right equipment with proper handling habits can be the key to avoiding frustrating printing issues and achieving smooth, reliable production all year round.

Nano Duo allows precise color engraving on stainless steel by forming oxide layers or thin-film interference colors. Using the LaserBurn software, users can easily test and determine optimal engraving parameters to achieve the desired colors on stainless steel. This guide covers material preparation, parameter testing, layer-based color engraving, and practical use cases.

Stainless Steel Color Engraving Principle

Color formation by laser:

When stainless steel is heated by a laser, colored oxides or a transparent oxide film form on its surface. Thin-film interference causes various colors to appear. Oxidation products of metallic elements also contribute to the coloration.

Oxide color

Oxidation products of stainless steel elements naturally display color.

Oxide thin film interference

Under suitable laser energy, a colorless transparent oxide film forms on the surface, producing optical interference and resulting in various colors.

Material Preparation

Software: LaserBurn

Machine: Nano Duo

Material: Stainless Steel

File: Color Engraving File

Note: Material testing is required before engraving to obtain optimal parameters.

Use Cases

Medical devices, decorative items, automotive marking, architectural decoration, etc.

How do I use Nano Duo to test parameters for different colors on stainless steel?

This color engraving parameter guide is based on the Longer Nano Duo model machine, using stainless steel as the metal material. Utilizing the "Material Test" function in the LaserBurn software, the preparation of engraving parameter test files is greatly simplified. Users can input relevant parameter ranges in the "Material Test Generator" to automatically generate test files. Key parameters include power, speed, interval, and number of engraving passes; these combinations directly affect the engraved color. By setting appropriate parameter ranges according to the specific dimensions of the material, users can generate corresponding engraving test files.

Operating procedures:

Step 1

Open LaserBurn and ensure the device is successfully connected to the software (click "Device" in the upper right corner—"Connect"—select "Nano Duo"—click "Confirm").

(Connection page)

(Operation page in connection)

(Page after successful connection)

Step 2

Draw a 10×10 mm square on the canvas and set it to Fill mode. Click "Array" in the toolbar and select "Material Test." A parameter matrix interface will appear.

Recommended parameter range for Nano Duo:

Power: 50% to 100%

Speed: 1000 mm/min to 3000 mm/min

Matrix layout: 10×10

Ensure all parameters are correct, then click Confirm to create the test file. Finally, click Device → Engraving → Laser Focus (two points coincide) → Frame → Start Engraving, and wait for completion.

After the engraving test is completed, the system will generate a color matrix (as shown in the figure). Users can select the desired color from the matrix and find the corresponding laser power and speed. The horizontal axis of the matrix represents the power parameter, and the vertical axis represents the speed parameter. Users can easily determine the required engraving settings by matching the coordinate positions.

How to create colorful sculptures

As shown in the image, we import the image and perform a layer split on the vector image:

Step 1

First, select the part of the vector image to be sculpted.

Step 2

Click the bottom right corner to set layer 1.

Step 3

As shown in the image, we set the leaf part as a layer.

Step 4

Next, set the second layer.

Step 5

As shown in the image, select the center part of the letter.

Step 6

Then, set the 3rd layer.

Final Result

Finally, we obtain the complete layered vector of the material, as shown in the figure. Then we match the corresponding parameters for the desired colors. After completion, the engraving will produce the ideal color image.

We eventually received a colored badge.

Conclusion

By properly testing and setting parameters, the Nano Duo can achieve high-quality color engraving on stainless steel. Users can adjust power, speed, interval, and passes to achieve the desired color effects. This method is suitable for decorative items, metal signage, and other precision applications, providing a reliable solution for stainless steel color engraving.

Introduction

The NanoDuo Visual Correction function is designed to improve engraving accuracy by using the machine’s built-in camera to align the engraving position with the working area. By calibrating the camera and the laser workspace, the system can automatically adjust the engraving placement based on the captured image.

Before using the NanoDuo's several vision-related features for the first time, you'll need to perform visual alignment. This involves sculpting a target marker pattern and then marking it in the photo sent by the camera. Before starting, ensure that no other apps are using the NanoDuo's camera.

Precautions

• Place the engraving paper in the engraving work area (use the provided white engraving paper).

• When using the vision correction function, ensure no other cameras are connected and that the machine's camera is not in use.

• Do not move the machine or the engraving paper during the vision correction process. Ensure the correction process is completed in one go.

• Do not reuse the engraved pattern for correction; a new marking pattern must be engraved.

Engraved Marking Graphics

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

1. first step

After connecting the nanoDuo, click the camera icon that appears in the menu bar to enter the vision correction function page.

Before entering the visual correction function page, please scale the canvas and move it to the side so that the entire canvas can be seen properly after the visual function page is opened.

2. Step 2

Enter the appropriate speed and power settings to achieve moderate engraving without burning through, and increase or decrease the scaling value until the canvas can accommodate the marked pattern.

3. Step 3

Click the Border Preview button to display the marker pattern on the canvas, ensuring it does not exceed the canvas size.

Note: Each time you modify the speed, power, and scaling values, you need to click the border preview button again to update the marker pattern on the canvas.

 4. Step 4

Click Start. If it's not clear enough, you can adjust the settings and run it again. When the pattern is clear and easy to see, click Complete. You may need to wait a few seconds on this screen for the camera to successfully capture your image.

Introduction

This document summarizes the common causes and solutions for CH340 driver installation issues on both Windows and macOS systems. It explains how to resolve problems related to system compatibility, driver conflicts, permission restrictions, USB cable issues, and security settings. It also provides methods to verify whether the driver is installed correctly and suggests alternative solutions if installation continues to fail.

By following the troubleshooting steps in this guide, users can quickly diagnose driver installation problems and restore normal communication between their device and computer.

Windows System

Common Causes and Solutions

1. System Compatibility Issues

Windows 10 and Windows 11 usually include a built-in driver for the CH340 chip. However, automatic installation may occasionally fail.

Solution

Download and install the latest driver manually from the official website:
https://www.wch.cn

Install the latest version of the driver package CH341SER.EXE.

2. Old Driver Conflicts

If an older version of the CH340 driver was previously installed, it may conflict with the new installation.

Solution

1. Open Device Manager.

2. Click View → Show hidden devices.

3. Expand Ports (COM & LPT).

4. Right-click any CH340/CH341 related devices and uninstall them.

5. Select Delete the driver software for this device if prompted.

6. Reinstall the latest driver.

3. Driver Signature Issues

Some systems, especially Windows 7 and certain Windows 10 configurations, may block unsigned drivers.

Solution

1. Restart your computer.

2. Enter Advanced Startup Options.

3. Select Disable driver signature enforcement.

4. Run the driver installer again.

4. Insufficient Permissions

Installing drivers requires administrator privileges.

Solution

Right-click the installer and select Run as administrator.

5. USB Cable or Port Problems

Some USB cables only support charging and do not transfer data. If such a cable is used, the device will not be recognized even if the driver is installed.

Solution

• Use a USB cable that supports data transfer.

• Connect the cable directly to the computer’s USB port (preferably USB 2.0).

How to Confirm the Driver Installation

1. Connect the Longer laser engraver to your computer.

2. Open Device Manager.

Under Ports (COM & LPT) you should see something similar to:

USB-SERIAL CH340 (COM3)

If this appears, the driver has been installed successfully.

If a yellow warning icon appears, the driver installation may have failed or there may be a driver conflict.

Alternative Solutions

If the driver still cannot be installed:

• Try using another computer to rule out system-related issues.

• Replace the adapter module with FT232 or CP2102, which often offer better compatibility.

macOS System

1. Check Whether a Driver Is Needed

Starting from macOS 10.13, the CH340 chip may sometimes be recognized automatically without installing a driver.

1. Connect your Longer laser engraver.

2. Open Terminal and enter:

ls /dev/tty.*

If you see a device such as:

/dev/tty.wchusbserial1410

The device has been detected successfully and no driver installation is required.

2. Install the Driver (If the Device Is Not Recognized)

Download the Driver

Official driver
https://www.wch.cn/downloads/CH341SER_MAC_ZIP.html

Open-source driver (recommended)
https://github.com/adrianmihalko/ch340g-ch34g-ch34x-mac-os-x-driver

The open-source version often provides better compatibility with newer macOS systems.

Allow System Extensions

During installation, macOS may display a message such as “System Extension Blocked.”

To allow the driver:

1. Open System Settings / System Preferences.

2. Go to Security & Privacy.

3. Under the General tab, click Allow for WCH Electronics Co., Ltd.

Restart Your Computer

After installation, restart your Mac so the driver can be loaded correctly.

Troubleshooting Common Issues

Driver Installed but No Port Appears

Open Terminal and run:

ls /dev/tty.*

Disconnect and reconnect the USB cable to check whether a new device appears.

Apple Silicon Macs (M1 / M2 / M3)

Many official drivers were originally designed for Intel-based Macs, which may cause compatibility issues on Apple Silicon devices.

For better stability, we recommend using the open-source driver from GitHub mentioned above.

Permission Restrictions on New macOS Versions

Recent macOS versions such as Big Sur, Monterey, and Ventura enforce stricter security policies for third-party drivers.

If the Allow option does not appear in Security & Privacy, you may need to:

1. Restart your Mac in Recovery Mode.

2. Temporarily disable System Integrity Protection (SIP).

3. Install the driver again.

Alternative Options

If you still cannot install the CH340 driver, you may consider these alternatives:

• Use an FTDI USB-to-serial module, which macOS supports natively without additional drivers.

• Use a Wi-Fi connection if your GRBL controller board supports wireless communication.

Nano Pro can be used for color engraving tests on stainless steel materials. By adjusting parameters such as power, speed, interval, and number of passes, different color effects can be achieved on stainless steel surfaces.

This article introduces the principles of stainless steel color laser engraving using Nano Pro, parameter testing methods, layered engraving workflow, and important precautions. By adjusting power, speed, interval, and passes, different color effects can be achieved on stainless steel surfaces.

1. Principle of Laser Color Engraving

The technical principle of color laser engraving varies depending on the material, but it mainly relies on two core methods: one is generating color naturally through oxidation reactions; the other is achieving the desired color effect through coloring agents.

For stainless steel color engraving, the technology is mainly divided into two categories. The first is that the laser beam instantly heats the metal surface, triggering physical or chemical reactions with the surrounding environment, thereby changing the surface color. The second is that the laser forms colored oxides on the metal surface or generates a transparent oxide film, producing various colors through thin-film interference effects.

By precisely adjusting key parameters such as laser power, engraving speed, interval, and passes, the reaction depth on the metal surface can be effectively controlled, achieving various color effects to meet different process requirements.

2. Stainless Steel Color Engraving Parameters

2.1 How to Test Different Color Parameters on Stainless Steel Using Nano Pro

The color engraving parameters in this example are based on the LONGER Nano Pro model, using stainless steel as the material.

With the "Material Test" function in LightBurn, the preparation of engraving parameter test files is greatly simplified. Users only need to enter the relevant parameter ranges in the "Material Test Generator" to automatically generate the test file. Key parameters include Power, Speed, Interval, and Passes. The combination of these parameters directly affects the final engraved color. By setting appropriate parameter ranges according to the material size, the corresponding test file can be generated.

The operation process is shown in the figure: first, start LightBurn, import the configuration file, select the correct serial port, and load the Nano Pro machine configuration. When the console displays "Nano Pro connected successfully," click "Laser Tools" in the toolbar to continue.

In the second step, after clicking "Laser Tools," select "Material Test." A matrix parameter setting interface will appear. Set the required matrix parameters in this interface. For Nano Pro, the recommended parameter range is Power 50%–100%, Speed 1000mm/min–3000mm/min, with an 11×11 matrix layout. After confirming the settings, click "Start" to begin the engraving test.

After completing the test, a color matrix will be generated. Users can select the desired color and find the corresponding power and speed parameters. The horizontal axis represents power, and the vertical axis represents speed. By matching the coordinates, the required settings can be determined.

2.2 How to Engrave a Color Artwork

Open LightBurn, click File → Import to load the layered image file, then connect to the Nano Pro machine.

After importing the image, perform layer processing on the vector graphic:

1) Select the vector section to be engraved.

2) Click the lower right corner and assign it to Layer 1.

3) As shown in the figure below, we set the butterfly section as a layer.

4) Then assign it to Layer 2.

5) Select the inner part of the butterfly.

6) Assign it to Layer 3.

After completing the layer separation, assign the corresponding color parameters to each layer. Once finished, start engraving to obtain the desired color result.

The final result is a blue butterfly.

3. Notes for Nano Pro Stainless Steel Color Engraving

3.1 Minimum Power

Important: When engraving stainless steel with Nano Pro, the power must remain above 50%. Power below 50% will result in very light coloration, mainly producing a single yellow tone. Engraving results are closely related to laser power, so precise adjustment is essential for achieving the desired color.

3.2 Minimum Stainless Steel Thickness and Surface Finish

During engraving, stainless steel plates that are too thin may deform due to heat accumulation. It is recommended to use stainless steel plates with a thickness of no less than 2 cm. Matte or brushed stainless steel surfaces are recommended for better engraving results. Industrial-grade or mirror-finish stainless steel is not recommended.

Common stainless steel surface finishes are shown below.

3.3 Ensure Level Positioning During Engraving

When using the recommended engraving parameters, ensure accurate laser focus and keep the Nano Pro machine level. Incorrect focus height will directly affect color uniformity and accuracy. Therefore, always calibrate the focus height before each operation.

Conclusion

By following the above methods, color engraving can be achieved on stainless steel using Nano Pro. Proper parameter testing, correct layer setup, and attention to power and material requirements are the key factors for obtaining stable color results.

Introduction

The Batch Fill function is designed to improve engraving efficiency by automatically identifying and copying a selected pattern onto multiple materials with similar contours. Using the camera to capture and recognize material outlines, the system replicates the design across all qualified objects in a single operation, ensuring consistent positioning and alignment.

Material Requirements

To ensure accurate recognition and proper batch placement, materials must meet the following conditions:

• All materials must be identical in shape, color, and material type.

  • Dimensional variation between targets must not exceed 10%.

  • Area variation must not exceed 25%.

• The material color must be clearly distinguishable from the background for accurate contour detection.
  

• Materials with highly reflective or glossy surfaces are not recommended.

• At least two or more materials must be fully visible and placed within the effective engraving area.

  • Minimum spacing between objects must be 5 mm.

• Material thickness must be less than 5 mm.

Precautions Before Use

• Ensure the camera function is operating properly before starting.

• Select the specific element(s) you want to batch fill.

  • The system will automatically remove any unselected elements before performing the batch operation.

• You must manually place the first pattern onto one material surface.

  • The batch fill process will replicate this pattern based on its position and angle.

• Keep the base plate clean, free of debris, dust, or scratches to ensure accurate detection.

Batch Filling Process

1. Place the Materials

1. Place materials of the same size, shape, and color on the base plate.

   • Maintain spacing greater than 5 mm between objects.

2. Ensure all materials are positioned within the effective engraving range.

• Figure 1: Correct placement

• Figure 2: Incorrect placement – objects too close together

• Figure 3: Incorrect placement – objects overlapping

• Figure 4: Incorrect placement – objects of different shapes

2. Capture Material Image

• Click Capture to take a photo of the materials and generate the contour outlines.

3. Set the Design Position

1. Create or import your design on the canvas.

2. Drag the design onto one material, ensuring it is fully positioned within the material boundary.

4. Batch Copy and Place Patterns

• Select the positioned design and click Batch Fill.

• The system will automatically detect the remaining material outlines.

• The design will be copied to each recognized object at the same relative position and angle.

5. Start Engraving

1. Adjust the appropriate material parameters.

2. Follow the normal engraving workflow.

3. Start the job to engrave all patterns on the canvas simultaneously.

Introduction

This guide explains how to use and calibrate the built-in camera function of the Nano Duo in LightBurn. Proper camera calibration ensures accurate visual positioning, improves engraving precision, and minimizes alignment deviations between the on-screen design and the actual engraved result.

Required materials: red cardstock, calibration card.

1. Open the LightBurn software, connect the Duo device, and then click Galvo Engraving Mode → BL 450 nm. (The connection is considered successful only if the following device information is displayed in the console.)

The above applies to versions below 2.0.00

The above applies to versions 2.0.00 and above.

2. Click Laser Tools → Calibrate Camera Lens in the upper left corner.

The above applies to versions below 2.0.00

The above applies to versions 2.0.00 and above.

3. Once you are on the Calibrate Camera Lens homepage, select USB Camera (the built-in camera).→ Standerd Lens→Next

The above applies to versions below 2.0.00

The above applies to versions 2.0.00 and above.

4. After proceeding to the next page, capture the images in the order of ①②③④ shown in the top left image, repeating this process nine times in different directions before proceeding to the next step of visual alignment. (If you proceed directly to visual alignment without performing visual calibration, engraving deviations may occur.)

Error demonstration: Overexposure, too bright

Correct demonstration

5. The following message indicates that the visual calibration operation has been completed. Please click "Align Camera" to enter the visual alignment page.

(1) The first method to access the visual alignment page

(2) The second method to access the visual alignment page

6. Remove the calibration card here, then select USB Camera (the built-in camera) and click Next.

7. In the parameter settings page, the necessary parameters to adjust are Fill Speed and Fill Power, as well as Line Speed and Line Power.7. After setting up, click Frame → Start, and then click Next when the sculpting is complete.

8. On this page, click Capture Image → Next.

9. Double-click the center point of the graphic in the order of 1, 2, 3, 4 until it looks like the second image, then click Next.

10. The following message indicates that the visual alignment operation has been completed.

11. Finally, verify if there are any obvious deviations, then return to the creation page→Window→Check Camera Control, and in the Camera Control page, select the camera module→Update Overlay

The above applies to versions below 2.0.00

The above applies to versions 2.0.00 and above.

12.Import the carving material, place it on the carving area in the canvas, and then click Frame (to confirm the carving position) → Start (to start carving).

13. After the carving is complete, click "Update Overlay" again to check if the carved position on the canvas matches the actual carved position. A deviation of 0.5-1 mm is normal. If the deviation is large, you need to repeat the visual alignment operation in step 7 above.)

Offline engraving on the Ray5 Series allows you to operate your laser projects directly from a TF card without connecting to a computer. This tutorial walks you through preparing GCode files, confirming engraving boundaries, and executing offline engraving for both old and new Ray5 models.

Table of Contents

1. What This Guide Covers
2. Quick Answer: How to Use TF Card for Offline Engraving
3. Why This Process Matters
4. Before You Start
   • Requirements
   • Precautions
5. Step-by-Step Tutorial
6. Model Version Differences
7. Common Problems and Solutions
8. Tips for Better Results
9. Frequently Asked Questions
10. Final Thoughts

What This Guide Covers

This guide provides a comprehensive walkthrough for performing offline engraving on Ray5 Series laser engravers. You will learn:

• How to prepare GCode files for offline use
• How to load and run engraving directly from a TF card
• Differences between old and new Ray5 models
• Tips for avoiding common errors and ensuring precise engraving

Quick Answer: How to Use TF Card for Offline Engraving

To perform offline engraving on the Ray5 Series:

1. Save your design as a GCode file (.gc or .nc) onto a TF card.
2. Insert the TF card into the Ray5 control box.
3. Access the file list via the File menu and select your design.
4. Verify the engraving boundary using Frame mode.
5. Start engraving and monitor the process.

Why This Process Matters

Offline engraving offers several advantages:

• Reduces dependence on a connected computer
• Avoids connectivity issues with USB or Wi-Fi
• Supports multiple projects simultaneously
• Provides consistent, repeatable results for professional-quality work

This method is ideal for both hobbyists and small businesses seeking efficient workflows.

Before You Start

Requirements

• Ray5 Series laser engraver (old or new version)
• TF card compatible with your machine
• Engraving file in GCode format (.gc or .nc)
• Safety equipment: laser safety glasses and proper ventilation

Precautions

• Only use TF cards recommended by the manufacturer
• Do not remove the TF card during engraving
• Confirm the machine’s working area before starting
• Keep fingers and other objects away from the laser head during operation
• Follow official machine specifications or instructions

Step-by-Step Tutorial

Step 1: Prepare Engraving File

Action: Save the engraving file in GCode format (.gc or .nc) to the TF card. Users can design patterns using LightBurn and export the GCode file directly to the TF card.
Expected Result: The TF card contains a ready-to-use engraving file.
Important Notes: Ensure the design dimensions fit the material and the machine’s working area.

Step 2: Start Offline Engraving

Action: Insert the TF card into the Ray5 control box and press File to access the TF card file list. Select the imported GCode file.

Expected Result: The file loads on the machine, ready for engraving.

Action: Enter the engraving preparation interface and click Frame to verify the engraving boundary.

Expected Result: The machine outlines the engraving area, confirming placement and size.

Action: After confirming the working area, press Start Engraving to begin the process.

Expected Result: The Ray5 laser engraves the selected design offline.

Important Notes: Interface layouts differ between old and new Ray5 models. Ensure you are following instructions corresponding to your version.

Model Version Differences

• Old Version Ray5: No air pump interface above the touchscreen

• New Version Ray5: Air pump interface located above the touchscreen

Understanding these differences helps ensure you navigate the interface correctly and avoid misconfigurations.

Common Problems and Solutions

Tips for Better Results

• Always use clean, properly formatted TF cards
• Secure material flat on the work area to prevent shifting
• Test engravings on scrap material before finalizing
• Keep lenses, mirrors, and the workspace clean
• Use adequate ventilation to minimize smoke residue

Frequently Asked Questions

Q1: Can I use any TF card with Ray5 Series?
A: Only use cards recommended by the manufacturer to prevent errors or device damage.

Q2: Do old and new Ray5 models operate the same offline?
A: Core steps are identical, but interface layouts and air pump placement differ.

Q3: What GCode formats are supported?
A: .gc and .nc files are supported for offline engraving.

Q4: How do I ensure the engraving fits the material?
A: Use Frame mode to preview the boundary before starting.

Q5: Can I pause offline engraving?
A: Yes, but never remove the TF card during operation.

Q6: Why is my TF card not recognized?
A: Ensure it is formatted correctly and compatible with the Ray5 Series.

Q7: Can I edit files on the machine?
A: Follow official machine specifications or instructions—editing on the device is not supported.

Final Thoughts

The Ray5 Series supports reliable offline engraving using a TF card. Properly preparing GCode files, verifying the engraving boundary, and understanding model differences ensures stable, professional-quality results. This method allows you to operate efficiently, minimize errors, and achieve consistent outcomes, making it ideal for hobbyists and small-scale production.

Video Tutorial