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b12aad6a8c
New printer option fan_direction (undefine/left/right/both, default undefine) declares which side the auxiliary part-cooling airflow comes from. When set and the printer has an auxiliary fan, auto-orient adds a yaw rotation so the dominant overhang area faces the airflow, and newly added primitive shapes are pre-oriented the same way (except the Cube, whose axis-aligned bounding box the pressure-advance pattern calibration depends on). - FanDirection enum + fan_direction printer option (Accessory group, enabled only with auxiliary_fan) - orient engine: weighted overhang areas per candidate, yaw-direction search, vertical rotation applied on top of the primary orientation; the cooling weights are taken from the candidate actually chosen, including the flat-bottom tie-break - orient_for_cooling() for primitive placement - set fan_direction=left on H2C/H2D/H2D Pro/X1/X1E/P1S 0.4 profiles (X1C/H2S/P2S/X2D/Qidi X-Max 4 already carried the key, which now takes effect) With fan_direction unset or no auxiliary fan the vertical rotation stays identity and auto-orient results are unchanged; slicing and g-code are never affected.