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780b2f1ebe
The Print-level LayeredNozzleGroupResult had a single producer, the by-layer branch of ToolOrdering, which is gated to non-sequential prints. The by-object branch in Print::process computed a grouping only in auto map modes and never stored it, so a sequential slice exported with a null group result: the per-nozzle placeholder tables came up empty and any start g-code indexing nozzle_diameter_at_nozzle_id[] aborted with "Indexing an empty vector variable". A prior by-layer slice masked the bug by leaving its (never cleared) result on the Print. Now the by-object branch runs get_recommended_filament_maps in every static map mode (in manual modes the result mirrors the user's assignment, deviations throw as in by-layer) and publishes it print-wide. The config write-back stays gated to auto modes: in manual modes it would only re-store the pre-slice values. Regression test: a two-object by-object print must publish a non-null group result and resolve nozzle_diameter_at_nozzle_id[] in start g-code (both fail without the fix). Suites green (libslic3r 48929/162, fff_print 633/60); 18-fixture byte gate identical; the by-object repro project goes from the export error to valid g-code, determinism x2.