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The reporter's P1S heated up, sat at Heatbed preheating for ten and a half minutes, then paused with 07FF_8012, "Failed to get AMS mapping table". Resuming only reheated it. Prints that fed from the AMS were fine. The plate was one filament of a seven-filament MakerWorld project, mapped by hand to the external spool. slice_info.config numbers filaments across the whole project, so the mapping for that plate is [-1,-1,-1,-1,-1,-1,254]: six placeholders and the spool holder. The command builder decides whether a print needs the AMS by asking whether the mapping is entirely external, and six -1s answer no. So the print went out as use_ams=true carrying a flat mapping of nothing but -1 -- 254 is deliberately never sent raw, the firmware reads it as AMS tray 0 -- which is exactly the mapping table the firmware then could not find. The builder cannot fix this itself. Down there a -1 is either padding for a filament this plate does not print, which is BambuStudio's own convention, or a slot that never resolved to a tray, and sending the second one to the spool holder is what #2589 exists to prevent. They are the same byte. The scheduler knows. extract_filament_requirements drops every filament with used_g <= 0, so it names precisely the slots the plate prints. When all of those are an explicit 254/255, dispatch now sends use_ams=false and the print runs. When one of them resolved to nothing, the flag is left alone and the firmware rejects the print as it does today -- deliberately, because that is the case where guessing would print a filament in the wrong material without saying so. Single-nozzle only, mirroring the reconcile in the command builder: on a two-extruder printer use_ams selects which nozzle to feed rather than whether to use the AMS, so an H2D with a spool on each side must keep the flag it was given. Judged generously from the model name and from live telemetry -- a second nozzle reporting a diameter, an extruder map, or more than one external feed -- because a wrong yes only preserves existing behaviour while a wrong no would reroute the print. H2S stays single-nozzle (#1386). Nothing in the command builder changed. Its own reconcile keeps the exact semantics #2589, #2595 and #797 gave it, and now usually agrees with a decision that was already made one layer up. Where the file has no parseable filament list the mapping is left exactly as before, the same evidence-only convention as #2771, and the parse itself sits behind a check for anything external at all so an AMS-only print never opens the file. Covered end to end at the dispatcher, including the reporter's seven-filament shape, a plate mixing the spool holder with an AMS tray, a consumed slot that never resolved, both external feeds on a dual-nozzle machine, and a 3MF with no filament list at all.