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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].