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A user discovered that FileZilla fails to retrieve directory listings from a Bambu A1 Mini 3D printer's FTP server despite successful authentication, while other clients like WinSCP work. The root cause ties to FTP's active vs. passive data connection modes and how the printer's firmware handles or advertises data connection endpoints. The author diagnosed the issue on Linux and patched FileZilla configuration (and/or behavior) to force a compatible FTP mode and address the printer's nonstandard
A user-reported FTP interoperability bug between FileZilla and the Bambu A1 Mini 3D printer prevents directory listings despite successful logins; WinSCP reportedly works. The author analyzed FTP’s active vs. passive modes and found the printer’s FTP server mishandles the data connection negotiation, causing FileZilla’s default behavior to fail on Linux. They modified FileZilla’s connection settings/code to force a compatible passive/active mode handshake (and provided configuration steps), enabling directory listing and file transfers without switching to Windows clients. This matters for makers and IT-savvy 3D printer users who rely on cross-platform FTP tooling and highlights the need for device vendors to follow FTP standards or support modern protocols.
A Linux user reported that FileZilla cannot list files when connecting to the FTP server on a Bambu A1 Mini 3D printer, despite successful authentication. The article traces the failure to the printer firmware’s handling of FTP passive mode (PASV). FTP uses a control connection (typically port 21) plus separate data connections for directory listings and transfers. Bambu printers reportedly reject active mode (PORT), so clients must use passive mode. However, the printer’s PASV reply returns an invalid IP address, shown as “227 (0,0,0,0,7,232)”, which causes FileZilla to attempt a data connection to 0.0.0.0 and fail. The author describes modifying FileZilla as a Linux-side workaround and provides configuration guidance. Published 2026-04-13.
A Hacker News thread links to a post about modifying FileZilla to work around an FTP issue with Bambu 3D printers. Community commenters discuss Bambu printers as good entry-level machines, concerns about potential vendor lock-in via filament RFID, and practical workarounds like taping RFID tags or keeping printers on LAN and avoiding firmware updates. Users also mention using alternative slicers such as Orca Slicer instead of Bambu's ecosystem. This matters to makers and IT-savvy printer owners because FTP problems can block remote file transfers and vendor controls (RFID/firmware) affect interoperability and user choice.
A user discovered that FileZilla fails to retrieve directory listings from a Bambu A1 Mini 3D printer's FTP server despite successful authentication, while other clients like WinSCP work. The root cause ties to FTP's active vs. passive data connection modes and how the printer's firmware handles or advertises data connection endpoints. The author diagnosed the issue on Linux and patched FileZilla configuration (and/or behavior) to force a compatible FTP mode and address the printer's nonstandard responses, enabling directory listings and file transfers. This matters because many 3D printer vendors expose FTP for uploads/timelapses; interoperability fixes let Linux users integrate devices without switching clients or waiting for vendor firmware updates.