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Three fixes for inventory spool usage not updating after prints: 1. Store ams_mapping from print command (reprint, library print, queue) so the usage tracker maps 3MF slots to the actual physical trays the user selected, not the default slicer mapping. 2. Track last_loaded_tray on printer state — the last valid tray_now (0-253) seen during printing. On H2D printers, tray_now is always 255 in AMS data; the real tray resolves via snow field ~44s after print start but reverts to "unloaded" at completion. The fallback chain is: tray_now_at_start > current tray_now > last_loaded_tray. 3. Use color similarity (Euclidean RGB distance, threshold 50) instead of exact hex match for auto-unlink fingerprint checks. RFID sensors report slightly different shades across reads (e.g. distance ~43.6 for the same spool), causing false assignment unlinks after prints.