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b2eeed2622
Filament grouping already consumed per-filament forbidden nozzle volume types, but every call site passed an empty map, so a variant-restricted filament (e.g. one limited to "Direct Drive TPU High Flow") could be auto-grouped onto an incompatible nozzle flow type on multi-variant printers. - add convert_to_nvt_type() to parse extruder variant strings - add Print::get_filament_unprintable_flow(): forbidden volume types = printer extruder variants minus the filament's declared variants; filaments declaring no variants stay unrestricted - feed the map into grouping at the by-object path (Print.cpp) and all six mapping/planning sites in reorder_extruders_for_minimum_flush_volume - unit-test the string parser Non-restricted configurations produce an empty map, so existing printers' grouping and g-code are unchanged.