Articles on: Troubleshooting

Why is my Elegoo printer offline?

Why is my Elegoo printer offline?


Elegoo Centauri Carbon and Centauri Carbon 2 printers connect to SimplyPrint through the SimplyPrint Client, a small app on a computer or Raspberry Pi on your network. When one shows offline, work through these steps in order.


Using an Elegoo Neptune 4 or another Elegoo printer with Klipper? That connects through Moonraker instead. See Why is my Klipper-powered printer offline?


What this guide covers


1. Check the Client is running and up to date

  1. Open http://localhost:8000 on the device that runs the Client, or http://<device-ip>:8000 from another computer.
  2. Go to Settings > About, click Check, and install any update.


Check: the Client opens, and Settings > About says it is up to date.


Many connection problems are already fixed in a newer version, so do this before anything else. Running prints keep going while the Client restarts. See How to update the SimplyPrint Client.


2. Run Diagnose

  1. Click Printers and find the Elegoo printer.
  2. If it isn't online, click Diagnose on its card.
  3. Follow the Try this next steps it shows.


Check: Diagnose says the printer is reachable, and the printer comes online.


3. Check the IP address

  1. On the printer's screen, find its current IP address in the network settings.
  2. In the Client, click Edit on the printer's card and compare IP address. If it is different, enter the new one and click Save changes.
  3. In your router, give the printer a fixed IP address or a DHCP reservation, so it keeps the same address.


Check: the printer reconnects and shows online in the Client.


The printer and the Client must be on the same network. A guest network or a separate VLAN often blocks the connection.


4. Centauri Carbon 2: LAN Only mode and the access code

The Centauri Carbon 2 needs LAN Only mode and its access code.


  1. On the printer, open Settings, scroll down and press LAN Only.
  2. Make sure LAN Only Mode is on, and note the IP address and access code shown there.
  3. In the Client, click Edit on the printer's card. Enter the Access code exactly as shown, with the same upper and lower case letters, then click Save changes.


Check: the printer shows online in the Client.


The Client doesn't find the printer

  • Enter the IP address by hand when you add the printer, instead of waiting for the scan.
  • The setup code doesn't appear, or the Client says it is waiting for one? Reload the Client's page.
  • Still nothing? Make sure the device running the Client can reach SimplyPrint, especially on a school or company network. See the network requirements.


Still on the early Elegoo beta client?

Before the SimplyPrint Client, a small group of beta testers connected Centauri Carbon printers with a separate Elegoo beta client. The SimplyPrint Client replaces it.


  1. Stop the beta client on the device that runs it: press Ctrl + C in the terminal window that runs simplyprint-centauri, or close that window. If you set it up to start by itself, turn that off too.
  2. Install the SimplyPrint Client. See How to install the SimplyPrint Client.
  3. Add the printer in the Client, click Set up in SimplyPrint, and choose Link to existing to keep the printer's history.


Check: the printer is online in SimplyPrint with its old name and history.


Still offline?

Download the Client's logs (Logs > download icon > Select all > Download) and send the .zip with your printer model and firmware version. See Manage the SimplyPrint Client: download the logs.


Updated on: 27/10/2026

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