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- Print::get_nozzle_config_index / get_filament_config_indx resolve a filament's variant slot per layer from the nozzle group result, with hashed index caches; when no group result is published (sequential prints), they fall back to the static filament->extruder mapping so behavior is unchanged - filament_map_2 caches each filament's resolved print-variant slot; rebuilt in Print::apply after the filament_map diff handling and in the filament-map write-back - filament retract overrides now key by slot indices: apply_override fallback indexing flips to 0-based, Print::apply passes filament_map/extruder indices, the write-back passes filament_map_2 (identical resolution while slots equal extruders) - filament_volume_map/filament_nozzle_map/filament_map_2/ filament_self_index become PrintConfig static members (required for member access); grouping input guards tightened so their registered 1-element defaults are never mistaken for real per-filament maps (single-filament manual mode keeps the mix-marker fallback) - update_filament_self_index_cache refreshed at every full-config assignment - tests: 0-based apply_override fallback, get_config_index_base hit/miss/mixed-type cases The resolvers are not consumed by the g-code writer yet. Non-Hybrid g-code is unchanged except the config header, which now serializes the three new static keys (defaults until the per-filament producer lands); verified by the 19-fixture byte gate: 3 added header lines per fixture, zero motion changes.