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Network Connection Troubleshooting

1. Your IP address shows up as 0.0.0.0 on the printer's LCD

1.1 Your WiFi information is missing or incorrect

  • Double check your SSID (wifi name) and password.

  • For Raspberry Pi, you'll have to re-image your SD card using Raspberry Pi Imager. In the 'advanced settings' make sure the SSID (WiFi name) and password is correct.

  • For Wireless Hub, double check the wifi.txt file. Make sure there are no spaces after the colon or at the end of your SSID/password.

    Example wifi.txt:

      # Put your wifi information below, it is case sensitive. Type it directly after the colon:like this.
    network-name:ExampleNetworkName
    password:ExamplePassword

2. You’re not seeing any IP on the printer LCD or having issues finding your IP address

2.1 Check the USB cable connecting your printer to your Pi / Hub

  • Make sure it is plugged in on the Pi/Hub side, as well as the printer side.
  • Make sure it supports data transfer, not just power transfer.
  • Make sure the cable isn't broken.
  • If in doubt, try a different USB cable.

2.2 Your printer may not support custom LCD messages

Download Angry IP Scanner and scan your network to find the IP of your Raspberry Pi / Wireless Hub (Rock64).

Once you find your IP address, type in https://<YOUR_IP_ADDRESS>:8080 into your browser. For example: https://192.168.1.123:8080.

2.3 Check to see if your RPi is underpowered. Ensure your RPi power supply is rated for at least 3 amps

  • You can tell your Pi is underpowered if it continuously cycles through reboot (flickers rapidly for 5-10s, turns off, and repeats the flicker).
  • If your power supply cannot supply at least 3 amps, then performance can be unstable. Your Pi may appear to work fine with a 2 amp supply, but under heavy load, it will require more power. Invest in a high-quality 3 amp power supply to avoid future headaches.

2.4 Ensure the RPI is booting properly

You can check the green LED lights on the RPi near the power cable. You will be able to see a red solid light at all times, and a green one that may flicker.

  • When SD not read properly, solid green for 15s, blink 4 times, solid green again
  • When no SD card/ not pushed in all the way, it will blink green, then solid green
  • Good SD card, flickers green rapidly on boot, occasional flicker of green after (no solid green at all)
  • If your SD card is corrupt, it will blink green 8 times.

3. My LCD displays an IP, but the UI does not load when trying to access (IP):8080

3.1 Update Timezone

If your printer LCD displays an IP, but the UI does not display when you are trying to access, it may be that the timezone of your RPi / hub is incorrect.

  1. Open the command prompt/ terminal of your computer.
  2. 2 For Raspberry Pi, type ssh [email protected]<your_ip> (eg. ssh [email protected]).
  3. For Wireless Hub, type ssh [email protected]<your_ip> (eg. ssh [email protected]).
  4. Type in yes to connect.
  5. Enter 3dque for your password.
  6. Type in date and check to see if your date matches your local time.
  7. If it does not, type in sudo raspi-config
  8. ‍Navigate down to 'Localisation Options'
  9. Go to ‘Change Time Zone' and select your region followed by your city.
  10. Once that has been completed, use your left and right arrows to head back and finish.
  11. You should see on your command prompt/terminal that it has updated to the correct time zone.
  12. Once completed, try accessing the UI once again on your local browser.

4. You’re able to access the user interface, but it just says "Waking up printer"

  • Wait 10 minutes, then restart your pi/hub. A software update may have been installed automatically.

If that doesn't work,

  • In the top right corner, click 'logs'. This will bring up the Quinly Management Center
  • Scroll down to see all USB devices connected. If your printer shows up

Otherwise...

  • Check to see if your school or work network has a firewall that prevents you from accessing the Pi / Hub remotely.
  • Ensure the USB cable is plugged in completely. Wait a minute or two and try connecting again.
  • Try a different USB cable. Make sure your USB cable supports data transfer.

5. I can see the IP on the printer LCD, but cannot load the user interface in a browser

Check to see if your school or work network has a firewall that prevents you from accessing the RPI remotely.

  • Look in your router settings for either “Wifi Isolation” or “Network Isolation”.
  • It’s often enabled to prevent wifi devices from seeing each other or from wifi devices accessing the rest of the local network.
  • It will likely be under Wireless > Advanced Settings, it will need to be disabled.
  • You may have to contact your internet service provider to help with configuring settings for your router.

6. I can access the user interface for a while, but then it stops working

  • Use an IP scanner, such as, Angry IP Scanner or log in to your router to check if your router is changing your Raspberry Pi / Wireless Hub's IP address.
  • To solve this issue, you will have to set a static IP for your RPi / Hub. This varies from router to router, so you may need to look up directions on how to do so.

7. The IP address shows up as 127.0.0.x

You may have set a static IP for your RPi or Wireless Hub, but something else is connected to that IP address.

  • Use an IP scanner, such as, Angry IP Scanner or log in to your router to check if something else is taking that IP address.
  • If so, set a different static IP for your Pi / Hub.

8. Prints stop halfway through for no reason. Connection to the printer is unstable

This can be for a variety of reasons. Please go through the following checklist. The solutions near the top of the list are most likely to be the cause of the instability.

  • Make sure your Raspberry Pi power supply is rated for at least 3 amps.
  • Make sure the SD card in your Pi / Hub is at least 16GB, and rated as 'Class 10'.
  • Make sure the SD card is from a reliable brand. Sandisk is the only brand we recommend using.
  • Make sure your Raspberry Pi / Wireless Hub is plugged into a power outlet with a stable power supply. If you're running a high-power appliance on the same circuit (e.g. refrigerator, AC, toaster, kettle, microwave, multiple 3D printers heating up at the same time) this can cause a momentary dip in power, which can interrupt the power to the Rapberry Pi or Wireless Hub, causing instability issues.
  • Your printer is running a really old version of Marlin firmware. Update to Marlin 2 as it fixes many USB communication stability issues.
  • Your printer firmware occasionally sends malformed responses to gcode commands. This is usually fixed by reflashing firmware.
  • The USB cable connecting your Pi / Hub to your printer may have a loose connection. Try a new USB cable.
  • The USB port on your 3D printer might be broken / loose. You may need a new motherboard. (or you can try re-soldering the USB port if you have the skills & equipment for it)
  • Your SD card may be corrupted. Re-flash 3DQue software onto your SD card. If the issue persists, try a new SD card (16 GB, Class 10, Reliable brand).
  • "Just turn it off and on again". Reboot your Pi / Wireless Hub.

9. Temperatures of the printer show at the wrong temperature. The printer doesn't wipe when it cools down.

Some people report that the temperature displayed in the browser is different than the temperature displayed on the printer LCD. There can be a few reasons for this.

  1. Communication between the printer and Pi / Hub got interrupted. Please see troubleshooting section 8 above.

  2. Some Creality printers have a bug in the firmware where temperatures are not displayed properly. If you go to the gcode console, and the temperature looks like this:

    tt::25.9125.91 //0.000.00 bb::33.7533.75 //0.000.00 @@::00 [email protected]@::00\n\n

Then your machine is affected with the firmware bug. Your temperatures should look like this:

t:19.63 /0.00 b:19.47 /0.00 @:0 [email protected]:0\n

The solution for this bug is to update your printer's firmware to the latest version of Marlin.