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The print uploaded, the printer took the command, and stopped at once with HMS 0500-4047 -- "the available hotend quantity or model does not match the sliced file". nozzle_mapping told the printer one of the plate's filaments went to no hotend while ams_mapping named the tray it comes from, and the firmware will not start a job on that contradiction. Each filament in a 3MF names the group it belongs to, and on every other dual-nozzle Bambu the group number is also the extruder index, so it was read as one. On a rack machine it is not: the rack carriage holds six hotends to the fixed carriage's one, so the slicer writes a group per nozzle rather than per carriage. The failing plate carried groups 0, 1 and 2 against a two-entry physical_extruder_map, and the filament in group 2 was dropped -- indistinguishable downstream from a slot the plate does not print, which is what reached the wire as -1. extract_nozzle_mapping_from_3mf now resolves the group through the table the file states for itself, the <nozzle id extruder_id> elements in slice_info.config. Files carrying no such table keep the direct index, so H2D slices are unaffected. A filament that still cannot be placed drops the whole mapping with a logged reason instead of half an answer: the firmware then picks its own nozzle, which is the pre-existing behaviour and far better than an answer that contradicts itself. Two related faults fixed in the same pass. The mapping was read across every plate in the file, so on a multi-plate project a slot took its extruder from whichever plate came last; it is now scoped to the plate being dispatched, in extract_filament_requirements as well. And the array is now one entry per filament slot, matching BambuStudio's own dispatch of [1, 16, 16] for a three-filament plate, rather than padded to a fixed 32. Verified against the file that failed: slot extruders [-1, 1, 0] became [0, 1, 0], and the wire [-1, 16, 1, -1 x29] became [1, 16, 1].