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maziggy
29379e3be7
Reporter @Andlar94 hit a permanent "Build plate not empty" on every print start on an A1 with an external RTSP camera. The runtime auto-check at main.py:1819 called check_plate_empty with use_external=external_camera_enabled, but the manual UI routes (camera.py) declared use_external: bool = False and the frontend client always sent use_external=false. So calibration captured a built-in frame and stamped it as the reference; the runtime check captured an external frame and diffed it against that reference -- a permanent mismatch. Centralise the default on the backend: both routes now take bool | None, deriving the default from the printer's external_camera_enabled + external_camera_url + external_camera_type. The frontend client stops sending the flag unless the caller explicitly sets it, so the existing UI call sites immediately benefit and any future caller gets the right camera automatically. Explicit overrides still win. Adds 4 regression tests pinning the new default for both the external-enabled and external-disabled cases, plus the explicit override path so a future "always built-in" caller stays supported.
