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- **Filament Override for Model-Based Queue** ([#486](https://github.com/maziggy/bambuddy/issues/486)) — When scheduling a print to "any printer" (model-based assignment), you can now override the 3MF's original filament choices. A new section in the print modal shows the filaments required by the sliced file and lets you swap each slot to any compatible filament loaded across printers of the selected model. The scheduler matches against the overridden type and color instead of the original 3MF values, preferring printers with exact color matches. On dual-nozzle printers (H2D), the override dropdown only shows filaments on the correct extruder for each slot. New `GET /printers/available-filaments` endpoint aggregates loaded filaments across all active printers of a given model. Backend stores overrides as a JSON column on the queue item and applies them at scheduling time by merging into filament requirements before AMS mapping. Translations added for all 6 locales (en, de, fr, it, ja, pt-BR).
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-- **SpoolBuddy Integration** — SpoolBuddy is now an optional add-on module within Bambuddy for managing filament spools with NFC scanning and precision weight measurement. Hardware: Raspberry Pi 4B + 7" touchscreen (1024x600) + PN5180 NFC reader + NAU7802 scale. **RPi daemon** (`spoolbuddy/daemon/`): asyncio-based Python service with concurrent NFC polling (300ms, MIFARE Classic with Bambu HKDF-SHA256 key derivation), scale reading (10 SPS, 5-sample moving average, stability detection), and 10s heartbeat — posts events to the Bambuddy backend via REST API with exponential backoff reconnect and 100-event in-memory buffer on failure. **Backend**: new `SpoolBuddyDevice` model for device registration, 10 REST endpoints under `/spoolbuddy/*` (device register/heartbeat, NFC tag-scanned/tag-removed, scale reading/weight-update, calibration tare/set-factor/get), 6 new WebSocket broadcast message types (`spoolbuddy_weight`, `spoolbuddy_tag_matched`, `spoolbuddy_unknown_tag`, `spoolbuddy_tag_removed`, `spoolbuddy_online`, `spoolbuddy_offline`), and a background watchdog task that marks devices offline after 30s without heartbeat. **Frontend**: dedicated kiosk-optimized UI at `/spoolbuddy` routes designed for a fixed 1024x600 pixel display with 48px minimum touch targets — includes Dashboard (50/50 split with live weight display in 72px tabular-nums and state-dependent spool info/actions), AMS Overview (printer selector + slot grid), Inventory (touch-friendly 2-column card grid with search), Printers (status cards with live data), and Settings (scale calibration with live weight, NFC reader status, device info). `useSpoolBuddyState` hook manages a reducer-based state machine driven by WebSocket CustomEvents. Translations added for all 6 locales (en, de, fr, it, ja, pt-BR).
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