Files
bambuddy/backend/app/utils
maziggy 4925b4c830 fix(slice): re-slice correctness — model label, honest errors, filament usage, nozzle guard
Five follow-up fixes to cross-printer re-slicing, all surfaced while
  testing archive re-slices.

  1. Re-sliced archive now records the printer it was sliced FOR.
     slice_and_persist_as_archive copied sliced_for_model from the source
     archive, so re-slicing X1C->H2D still showed "X1C sliced". Read it
     from the freshly-sliced 3MF's parsed metadata instead, falling back
     to the source only when absent.

  2. Real slicer rejections are surfaced instead of silently masked.
     _run_slicer_with_fallback retried with the 3MF's embedded settings on
     any sidecar 5xx — including genuine content rejections (object off
     the bed, incompatible filament temps), which "succeeded" only by
     re-slicing for the source's original printer. A new
     _slicer_rejection_message detects the slicer's own error string and
     surfaces it as a 400; the embedded-settings fallback is kept only for
     true CLI crashes.

  3. A failed slice opens an error modal, not a 3s toast. The slicer's
     reason is actionable and a toast hides it before it can be read. New
     AlertModal (acknowledge-only); SliceJobTrackerContext shows it on a
     failed job. New slice.failedTitle key in all 9 locales.

  4. Sliced files no longer report "0 g" filament usage. The sidecar
     doesn't always populate the X-Filament-Used-* headers;
     ThreeMFParser._parse_gcode_header now also reads the slicer's own
     "total filament weight/length" from the G-code header, and both
     slice-persist paths fall back to it when the sidecar reports 0.

  5. Nozzle-class re-slice guard. Re-slicing across the single-nozzle <->
     dual-nozzle boundary (e.g. X1C -> H2D) fails BambuStudio's
     multi-extruder validation; both slice routes now reject it up front
     with a clear 400. The dual-nozzle model classification — previously
     an inline tuple duplicated across start_print and the K-profile
     routes — is centralized into DUAL_NOZZLE_MODELS / is_dual_nozzle_model
     in printer_models.py, consumed by all three sites and the guard.

  Full cross-nozzle-class re-slicing (dual-nozzle project_settings
  reconciliation) remains separately tracked.

  Tests: _slicer_rejection_message, _canonical_printer_model,
  guard_nozzle_class_reslice, is_dual_nozzle_model, the G-code-header
  filament parse, AlertModal, and end-to-end slice-API coverage including
  an X1C-archive-to-H2D 400. Backend ruff + i18n parity clean; frontend
  build clean.
2026-05-22 12:34:08 +02:00
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