Single-nozzle printers (X1C, P1S, A1) report tray_now=254 for external
spool, but BambuStudio sends ams_id=255 (VIRTUAL_TRAY_MAIN_ID) in the
print command's ams_mapping2 field. Bambuddy was passing 254 as-is,
causing firmware to target AMS tray 0 instead of external spool —
resulting in 07FF_8012 "Failed to get AMS mapping table" or prints stuck
at heatbed heating when an AMS is connected but empty.
Map external spool to ams_id=255 for all non-H2D printers. H2D
dual-nozzle printers retain 254 (deputy) / 255 (main) distinction.
maziggy
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