Mainsail Crew Mainsail — Klipper 3D Printer Web UI — Default Password
Default username and password for the Mainsail Crew Mainsail — Klipper 3D Printer Web UI: (blank) / (blank). Learn how to log in and how to change the default credentials.
Web UI (port 80) is completely open with no authentication — any host on the network can access and control the printer. MainsailOS (official Raspberry Pi image) sets default SSH credentials: pi/raspberry (standard Raspberry Pi OS default). Securing the web UI requires adding nginx basic_auth or a reverse proxy.
| Username | Password | Access | Notes |
|---|---|---|---|
(blank / none) | (blank / none) | Web UI | No authentication; web UI fully open |
pi | raspberry | SSH | MainsailOS Raspberry Pi image SSH default |
Responsible use
This database lists publicly documented default credentials so administrators can find and change them. Only use these on systems you own or are authorized to test.
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