Modern 3D printers built on controllers Lerdge, require not only precise mechanics but also stable remote control. Connecting the board to a local network opens access to a web interface, allowing you to monitor the print, upload G-code, and control the temperature from any device in the house. This turns an ordinary machine into a fully-fledged element of the ecosystem. smart home.
However, the setup process often presents difficulties due to the specific firmware and driver requirements. Unlike popular Marlin systems with Klipper, the interface can behave unpredictably when switching routers or updating firmware. It's crucial to understand that the Lerdge's WiFi module operates in client (Station) mode, not as an access point, so it doesn't distribute the Internet on its own.
In this article, we'll cover every configuration step: from physically installing the module to fine-tuning a static IP address. You'll learn how to avoid common mistakes related to router frequency ranges and ensure a reliable connection between your computer and printer. Get ready for a deep dive into technical details that will save you hours of frustration.
Selecting a compatible WiFi module and preparing equipment
The first step is to check the hardware compatibility. Boards Lerdge (X, S, K series) have a specific connector for the wireless module, usually marked as WIFI or UART-WIFIStandard USB WiFi adapters like those you use on your laptop won't work here—you'll need a specialized module based on ESP8266 or ESP32 chips, flashed to the specific controller firmware version.
Users often encounter a situation where a module is physically connected, but the system doesn't detect it. This could be due to a lack of power or incorrect connector pinout. Carefully inspect the contacts on the boards. Lerdge They are sometimes positioned in a mirror image compared to other Chinese controllers. If the module heats up immediately after powering up but isn't detected in the menu, the voltage regulator may have burned out.
For successful integration, you'll need to ensure that the board's firmware version supports networking. Older firmware versions may lack the necessary drivers or have bugs in the TCP/IP stack. Before purchasing the module, go to the menu. More -> About and record the current version. Check the changelog for the latest updates on the manufacturer's official website or in specialized communities.
⚠️ Warning: Do not attempt to connect WiFi modules designed for 3.3V logic to 5V ports without checking the documentation. This will inevitably damage the UART port on the Lerdge board's processor.
Make sure your router supports the 802.11 b/g/n standard at 2.4 GHz. 3D printer modules rarely support the modern 5 GHz band. If you have a dual-band router, make sure the networks are separated or the older standard is prioritized; otherwise, the printer simply won't see your network in the list of available ones.
Physical installation and initial diagnostics
The installation process begins with completely powering down the printer. Hot-plugging the module can cause a short-term current surge, which can damage the controller's sensitive electronics. Locate the corresponding connector on the board—it's usually located near the USB and SD card ports. Carefully insert the module, observing the connector keying.
After powering on, pay attention to the module's LED indicator. In normal operation, the LED should flash at regular intervals, indicating network searching or standby mode. If the indicator is constantly lit or doesn't light at all, check the connector's tightness. Sometimes contact is lost due to vibration during printing, so it's a good idea to secure the module with heat shrink tubing or a drop of glue (avoid covering the antenna!).
☑️ Module connection diagnostics
Initial diagnostics also include checking the system's response. Go to the printer menu and find the section responsible for networking. Even if WiFi isn't configured, the system should at least display the module status as "Connected" or "Ready." If there's no WiFi setup option in the menu at all, the firmware hasn't recognized the device, and you need to recheck the connection or replace the module.
Setting up a network via the web interface and printer menu
Basic setup is performed via the built-in menu on the touch screen or via the web interface if the initial connection has already been established. In the menu Settings -> Network (or similarly), select your home network from the list. Enter the password, making sure to be case-sensitive. Password errors are the most common cause of failure, as the printer's on-screen keyboard can be difficult to use.
If automatic IP address acquisition (DHCP) is unstable, which often happens in complex home networks with multiple devices, it makes sense to assign a static address. This ensures that the printer address doesn't change after a router reboot, and your browser or slicer shortcuts don't stop working. To do this, select the "Static" mode. Static IP and enter the details that match your subnet.
How to find out the gateway and subnet mask?
Go to your computer's network settings (Windows: cmd -> ipconfig, macOS/Linux: ifconfig). Find the "Default Gateway" and "Subnet Mask" lines. Use these values for the printer, changing only the last digit of the IP address to a free one, for example, 192.168.1.150.
After entering all the parameters, you need to save the settings and reboot the network module. This is usually done by pressing the button Apply or ReconnectThe process takes 10 to 30 seconds. During this time, the printer may temporarily stop responding to screen button presses—this is normal behavior and indicates the network stack is rebooting.
| Parameter | Description | Example of meaning |
|---|---|---|
| SSID | Your WiFi network name | Home_Network_5G |
| IP Address | A unique address on a local network | 192.168.1.120 |
| Subnet Mask | Subnet mask (usually default) | 255.255.255.0 |
| Gateway | Your router's address | 192.168.1.1 |
Working with drivers and software
Connecting a computer to a printer over a network often requires installing specialized software or virtual COM port drivers if you're using serial connection emulation over WiFi. In Windows, you may need to manually search for the driver in Device Manager if the system doesn't find it automatically. Look for drivers for the chip. CH340 or CP2102, depending on the implementation of the bridge in your module.
Linux and macOS users typically don't have driver issues, as serial port support is built into the kernel. However, port permissions may restrict the connection. In this case, you need to add the current user to the group. dialout or ttyThe command looks something like this: sudo usermod -a -G dialout $USER.
Configuring your firewall is important. Antivirus software and built-in Windows security may block incoming connections from the printer, considering them suspicious. When you first start network communication, allow access for the application you use to manage the printer (e.g., Pronterface, OctoPrint, or a browser).
⚠️ Please note: 3D printer control interfaces and controller firmware are frequently updated. The menu item locations or option names in your Lerdge version may differ from the screenshots online. Always consult the latest documentation for your specific board revision.
Solving common connection problems
One of the most common issues is when a printer connects to the router but has no internet access or can't be pinged from the computer. This is often due to router security settings, such as AP Isolation. If this feature is enabled, devices on the WiFi network cannot see each other. Disable it in the router settings.
It's also worth paying attention to the encryption type. Older WiFi modules may not support the WPA3 standard or mixed WPA2/WPA3 mode. Try temporarily switching your router to WPA3-only mode. WPA2-PSK (AES)This is the most compatible standard, guaranteed to work with most IoT devices.
If the connection constantly drops during long prints, check the signal strength. A 3D printer is often placed on the floor or in an alcove, where the signal is weak. The printer's metal casing also shields the signal. Try moving the router closer or using a WiFi repeater. An unstable signal will result in lost data packets and printing halts.
Security and remote access
By connecting your printer to the network, you potentially expose it to a device with direct access to electricity and heating elements. Basic security requires changing default passwords if the firmware allows them. Never expose the printer's control interface to the open internet (forward ports on the router) without using a VPN or authorization.
For secure remote monitoring, it's best to use cloud intermediary services or set up a tunnel. Direct access from an external network to the printer's local IP address is a risk that could be exploited by attackers for attacks or simply for pranks. Remember, a compromised 3D printer can cause a fire.
Update your board firmware regularly LerdgeDevelopers are fixing vulnerabilities and improving the stability of the network stack. Stay up-to-date on official resources and community forums. The security of your smart home depends on attention to detail.
Why doesn't the printer see my WiFi network in the list?
Most likely, your router is operating at 5 GHz or using channels higher than 11, which are not supported by the module. Switch the router to 2.4 GHz mode and select channels 1-11. Also, check that the network name (SSID Broadcast) isn't hidden.
Can Lerdge be used with OctoPrint?
Yes, but the functionality will be limited. Lerdge has its own web interface. Deep integration with OctoPrint may require installing plugins or using serial-over-USB emulation over the network, if the firmware supports it.
How do I reset network settings on a printer?
In the Network menu, find the "Reset Settings" or "Restore Default" option. If you can't access the menu, you can try reflashing the firmware by clearing the settings (usually the "Wipe Settings" option during boot), but this will reset all parameters, including calibration.
Does WiFi affect print quality?
The WiFi module itself generates electromagnetic interference. If the module cable is routed near stepper motor or end-stop wires, ringing may occur on the printed circuit board. Use shielded cables and keep the antenna away from sensitive electronics.