2.0.0rc1 Bambu connection issues

[St-Aris]

The problem

Seeing inconsistent behaviour with bambu connector. Errors in the octoprint log file may corroborate.

Steps to repro:

1. Check the Set as default connection settings and Auto-connect on server startup options (note these to not stay checked in the UI so unsure if they are being set permanently)
2. Manually connect to bambu printer
3. Switch bambu printer off
4. Printer shows as Offline after about a minute
5. Switch printer back on.
6. Printer does not go operational.
7. I press connect and it connects.

Octoprint shows these logs continuously until I press connect:

2026-04-29 09:17:36,133 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:17:38,577 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:17:49,470 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:17:55,481 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:02,365 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:08,221 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:15,304 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:21,265 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:27,638 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:33,431 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:39,936 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:46,041 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:52,753 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:18:58,328 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:05,282 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:09,808 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:18,161 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:20,986 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:30,171 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:31,002 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:43,526 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:44,517 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:56,965 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:19:57,482 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:09,943 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:10,959 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:22,145 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:23,143 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:33,849 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:35,496 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:46,107 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:47,897 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:20:58,164 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin
2026-04-29 09:21:00,089 - octoprint_bambu_connector.connector - ERROR - Error while processing BPM update
Traceback (most recent call last):
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 857, in _on_bpm_update
    self._update_state_from_state(printer)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 981, in _update_state_from_state
    self.set_state(new_state, error=error)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint_bambu_connector/connector.py", line 303, in set_state
    self._listener.on_printer_files_available(True)
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/printer/standard.py", line 1585, in on_printer_files_available
    storage = PrinterFileStorage(self._connection)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/octopi/oprint/lib/python3.11/site-packages/octoprint/filemanager/storage/printer.py", line 69, in __init__
    raise ValueError(
ValueError: Connection must implement octoprint.printer.PrinterFilesMixin

Did the issue persist even in safe mode?

I cannot test this issue in safe mode (state why below)

If you could not test in safe mode, please state why ("currently printing" is NOT an excuse!)

Connection type gives no options in Safe mode

Version of OctoPrint

2.0.0rc1

Operating system running OctoPrint

octopi 1.11

Browser and version of browser, operating system running browser

Firefox latest

Printer model & used firmware incl. version

Cambu A1 1.03.30.01

Systeminfo Bundle

octoprint-systeminfo-20260429092935.zip¹

Checklist of files to include below

• Contents of the JavaScript browser console (always include in cases of issues with the user interface)
• Screenshots and/or videos showing the problem (always include in case of issues with the user interface)
• GCODE file with which to reproduce (always include in case of issues with GCODE analysis or printing behaviour)

Additional information & file uploads

Since I selected the default connection settings & auto connect - i'd expect octoprint to connect to the printer as soon as it switches on.

Footnotes

1. octoprint-systeminfo-20260429092935.zip (bundleviewer) (download)
   OctoPrint: 2.0.0rc1
   Python: 3.11.2
   OS: Linux-6.12.75+rpt-rpi-v7-armv7l-with-glibc2.36
   RPi: Raspberry Pi 2 Model B Rev 1.1
   OctoPi: 1.1.0 (build 2025.05.13.134411)
   Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:150.0) Gecko/20100101 Firefox/150.0 ↩

[foosel]

Please open issues about the bambu connector on its own repo: https://github.com/OctoPrint/OctoPrint-BambuConnector. I'm moving this one.

[St-Aris]

Would the auto connect on server startup not working be a bambu connector plugin issue - or an octoprint issue?

[jneilliii]

The auto connect feature is part of core but there may be something with the collector plugin that needs to be implemented for it to work. I haven't had a chance to look yet at this issue.

[jneilliii]

Since I selected the default connection settings & auto connect - i'd expect octoprint to connect to the printer as soon as it switches on.

The plugin is functioning as expected. The auto connect option that you are mentioning is for when OctoPrint starts up, not when you printer is powered on and starts up. The plugin does not monitor or poll the IP address of the printer until there is a response. OctoPrint will remain disconnected until you press the Connect button in this case.

The "Error while processing BPM update" message is something that I wonder could potentially be used to create a connection automatically. It's acting like the underlying BPM module that is communicating to the printer is staying alive and when the printer comes back on it's trying to send updates to the plugin but the plugin isn't in a "connected" state to receive them, hence the error. I'm thinking maybe the internal disconnect function isn't getting called in the plugin when the printer goes offline, hence bpm's quit command is never sent like it is when you press the disconnect button in OctoPrint. More testing necessary to verify.

[St-Aris]

Are you sure about that? It was a while ago, but when i used octoprint with a serial/usb printer previously i don't recall having to press connect each time my printer was switched on. It just connected.

[St-Aris]

Please reopen 😀. Closed in error.

[jneilliii]

Are you sure about that? It was a while ago, but when i used octoprint with a serial/usb printer previously i don't recall having to press connect each time my printer was switched on. It just connected.

If you had the port lister plugin installed with a saved serial connection then it would auto-reconnect. Otherwise it does not.

[St-Aris]

Aha - yes you are right - that rings a bell now. I set this up what feels like 10 years ago and just left it. It just worked :)

Perhaps the port lister could be updated for these new connectors, or a feature could be added into Octoprint itself to enable this. It only makes sense to automatically connect to a printer when it switches on.