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Clifford GarwoodandClaude Opus 5
c94e8324d0
The IMEX branch of the 1st->2nd layer temperature transition is mutually exclusive with the standard per-extruder path in its `else`, but it skipped the head carrying the print's own toolpaths on the premise that "the standard per-extruder temp path already addresses it". That path is the `else` branch and never runs for a parallel mode, so the printing head received no transition at all and held nozzle_temperature_initial_layer for the entire job. Emit for every carriage the mode drives, the printing one included. The printing head takes this layer's own filament; the parallel carriages, which carry no toolpaths of their own, keep resolving through the per-plate head map with pem inversion as the fallback. The lookup now goes through get_filament_config_index() like the standard path, since a variant-expanded printer gives a filament its own column and a raw index would read the wrong one. Reproduced on a 4-carriage IQEX in copy mode: the only temperature command in the whole file set the idle secondary carriage to the value it already had, while the head doing the printing never left its first-layer temperature. The defect is invisible whenever initial and regular temperatures match, which is why earlier per-tool validation passed. Tests cover both gantry counts, since the active set comes from the mode's tool roster: an IDEX copy mode drives two carriages, an IQEX mode drives four, and the IQEX case asserts a first-layer filament and a second-layer transition for each of the four. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>