CC2 wont connect

[EPRRSystems]

When connecting to my CC2 it finds the printer but wont connect. Any ideas??

[danielcherubini]

Hi, Without debug logs i cant really help much

https://github.com/danielcherubini/elegoo-homeassistant/wiki/Enabling-Debug-Logging

[EPRRSystems]

2026-02-07 19:57:42.918 WARNING (MainThread) [custom_components.elegoo_printer] Registration timeout
2026-02-07 19:57:42.919 ERROR (MainThread) [custom_components.elegoo_printer] Failed to register with CC2 printer
2026-02-07 19:57:42.919 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:57:42.919 DEBUG (MainThread) [custom_components.elegoo_printer] CC2 MQTT listener cancelled
2026-02-07 19:57:42.919 INFO (MainThread) [custom_components.elegoo_printer] CC2 MQTT listener stopped
2026-02-07 19:57:42.920 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:57:48.383 DEBUG (MainThread) [custom_components.elegoo_printer] CONFIGURATION {'brand': 'ELEGOO', 'camera_enabled': False, 'cc2_access_code': None, 'cc2_token_status': 1, 'connection': 'F01VP58UKQ99B7D', 'external_ip': None, 'firmware': None, 'has_vat_heater': False, 'id': 'F01VP58UKQ99B7D', 'ip_address': '192.168.100.100', 'is_proxy': False, 'model': 'Centauri Carbon 2', 'mqtt_broker_enabled': False, 'name': 'Centauri Carbon 2', 'open_centauri': False, 'printer_type': 'fdm', 'protocol': None, 'protocol_version': 'CC2', 'proxy_enabled': False, 'proxy_video_port': None, 'proxy_websocket_port': None, 'transport_type': 'cc2_mqtt'}
2026-02-07 19:57:48.383 DEBUG (MainThread) [custom_components.elegoo_printer] Testing connectivity to printer: Centauri Carbon 2 at 192.168.100.100 (transport: cc2_mqtt)
2026-02-07 19:57:48.384 INFO (MainThread) [custom_components.elegoo_printer] Using CC2 MQTT transport for printer Centauri Carbon 2
2026-02-07 19:57:48.400 DEBUG (MainThread) [custom_components.elegoo_printer] CC2 printer MQTT broker at 192.168.100.100:1883 is reachable
2026-02-07 19:57:48.400 DEBUG (MainThread) [custom_components.elegoo_printer] Connecting to printer: Centauri Carbon 2 at 192.168.100.100 with proxy enabled False
2026-02-07 19:57:48.400 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:57:48.400 INFO (MainThread) [custom_components.elegoo_printer] Connecting to CC2 printer Centauri Carbon 2 at 192.168.100.100:1883
2026-02-07 19:57:48.428 DEBUG (MainThread) [custom_components.elegoo_printer] Subscribed to topic: elegoo/F01VP58UKQ99B7D/1_HA_2bc05b06/api_response
2026-02-07 19:57:48.432 DEBUG (MainThread) [custom_components.elegoo_printer] Subscribed to topic: elegoo/F01VP58UKQ99B7D/api_status
2026-02-07 19:57:48.435 DEBUG (MainThread) [custom_components.elegoo_printer] Subscribed to topic: elegoo/F01VP58UKQ99B7D/1_HA_2bc05b06_req/register_response
2026-02-07 19:57:48.435 DEBUG (MainThread) [custom_components.elegoo_printer] Registering with CC2 printer: 1_HA_2bc05b06
2026-02-07 19:57:51.436 WARNING (MainThread) [custom_components.elegoo_printer] Registration timeout
2026-02-07 19:57:51.436 ERROR (MainThread) [custom_components.elegoo_printer] Failed to register with CC2 printer
2026-02-07 19:57:51.436 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:57:51.436 DEBUG (MainThread) [custom_components.elegoo_printer] CC2 MQTT listener cancelled
2026-02-07 19:57:51.436 INFO (MainThread) [custom_components.elegoo_printer] CC2 MQTT listener stopped
2026-02-07 19:57:51.438 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:58:01.794 DEBUG (MainThread) [custom_components.elegoo_printer] CONFIGURATION {'brand': 'ELEGOO', 'camera_enabled': False, 'cc2_access_code': None, 'cc2_token_status': 1, 'connection': 'F01VP58UKQ99B7D', 'external_ip': None, 'firmware': None, 'has_vat_heater': False, 'id': 'F01VP58UKQ99B7D', 'ip_address': '192.168.100.100', 'is_proxy': False, 'model': 'Centauri Carbon 2', 'mqtt_broker_enabled': False, 'name': 'Centauri Carbon 2', 'open_centauri': False, 'printer_type': 'fdm', 'protocol': None, 'protocol_version': 'CC2', 'proxy_enabled': False, 'proxy_video_port': None, 'proxy_websocket_port': None, 'transport_type': 'cc2_mqtt'}
2026-02-07 19:58:01.794 DEBUG (MainThread) [custom_components.elegoo_printer] Testing connectivity to printer: Centauri Carbon 2 at 192.168.100.100 (transport: cc2_mqtt)
2026-02-07 19:58:01.794 INFO (MainThread) [custom_components.elegoo_printer] Using CC2 MQTT transport for printer Centauri Carbon 2
2026-02-07 19:58:01.812 DEBUG (MainThread) [custom_components.elegoo_printer] CC2 printer MQTT broker at 192.168.100.100:1883 is reachable
2026-02-07 19:58:01.812 DEBUG (MainThread) [custom_components.elegoo_printer] Connecting to printer: Centauri Carbon 2 at 192.168.100.100 with proxy enabled False
2026-02-07 19:58:01.812 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:58:01.812 INFO (MainThread) [custom_components.elegoo_printer] Connecting to CC2 printer Centauri Carbon 2 at 192.168.100.100:1883
2026-02-07 19:58:01.842 DEBUG (MainThread) [custom_components.elegoo_printer] Subscribed to topic: elegoo/F01VP58UKQ99B7D/1_HA_9111b8ae/api_response
2026-02-07 19:58:01.847 DEBUG (MainThread) [custom_components.elegoo_printer] Subscribed to topic: elegoo/F01VP58UKQ99B7D/api_status
2026-02-07 19:58:01.858 DEBUG (MainThread) [custom_components.elegoo_printer] Subscribed to topic: elegoo/F01VP58UKQ99B7D/1_HA_9111b8ae_req/register_response
2026-02-07 19:58:01.858 DEBUG (MainThread) [custom_components.elegoo_printer] Registering with CC2 printer: 1_HA_9111b8ae
2026-02-07 19:58:04.860 WARNING (MainThread) [custom_components.elegoo_printer] Registration timeout
2026-02-07 19:58:04.860 ERROR (MainThread) [custom_components.elegoo_printer] Failed to register with CC2 printer
2026-02-07 19:58:04.860 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer
2026-02-07 19:58:04.860 DEBUG (MainThread) [custom_components.elegoo_printer] CC2 MQTT listener cancelled
2026-02-07 19:58:04.860 INFO (MainThread) [custom_components.elegoo_printer] CC2 MQTT listener stopped
2026-02-07 19:58:04.862 INFO (MainThread) [custom_components.elegoo_printer] Closing CC2 connection to printer

[danielcherubini]

Issue Identified and Fixed

The connection problem you're experiencing with your CC2 printer has been identified and fixed!

The Problem

When you see the printer but can't connect, it's typically an authentication issue. The integration was using a hardcoded fallback password ("123456") when no access code was provided during setup. However, many CC2 printers ship with different defaults:

• Empty password (no password at all) - most common factory default
• Custom access code set by the user in printer settings

When the integration tried to authenticate with the wrong password, the printer would silently reject it, causing the connection to fail.

There was also a bug where even if the integration discovered the correct password was an empty string, it wouldn't save it to your configuration due to Python's falsy checks.

The Fix

A comprehensive fix has been implemented in PR #330:

1. Multi-password fallback: When no access code is provided, the integration now tries multiple common passwords automatically:

   • Empty password (most common)
   • "123456" (documented default)

2. Improved setup flow: New two-step authentication that explicitly asks if your printer requires an access code, with clear instructions (Settings → Network → Access Code on the printer).

3. Actual connection testing: The integration now validates the connection during setup instead of accepting printers without testing.

4. Fixed persistence bug: Empty passwords are now properly saved to your configuration.

5. Better error messages: When authentication fails, you'll see helpful guidance pointing to exact printer settings.

Next Steps

This fix should land today. Once it's released:

1. Remove and re-add your CC2 printer in Home Assistant
2. When asked "Does your printer require an access code?", select:
   • No if you haven't set a custom code (most common)
   • Yes if you've configured a custom access code in printer settings
3. The integration will automatically try the correct passwords
4. Your printer should connect successfully!

Check back soon for the release, and please let us know if this resolves your issue!

[EPRRSystems]

Thanks for responding so quickly. I can now connect but only if the printer is in LAN only mode. Is this something you could look at when you have some time?

[danielcherubini]

we're tracking it in #329

[danielcherubini]

CC2 looks like its lan-only mode for now.. something must have changed on elegoo's side.. will figure this out going forward.