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H2D Pro firmware interprets use_ams as a nozzle index when sent as integer (1 = deputy nozzle) instead of boolean. Bambu Studio sends use_ams: true (boolean) while using integers for calibration fields. Bambuddy was converting all boolean fields to integers for H2D series, routing filament to the deputy nozzle instead of main, causing extrusion motor overload at ~75% print completion. Keep use_ams as boolean for all printers, matching Bambu Studio format.