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maziggy
080176c6e5
external-spool extruder routing (#1257) X2D with 0 AMS units and two external spools (Ext-L feeding left extruder, Ext-R feeding right) showed "Required filament type not found in printer" even when the matching filament was physically loaded. Cause: useFilamentMapping derived dual-nozzle status from ams_extruder_map being non-empty -- that map is populated from AMS info bits, so dual-nozzle printers without AMS got an empty map and hasDualNozzle=false. External spools then fell through to extruderId=undefined, and the nozzle-aware filter rejected every candidate because undefined !== 0/1. Prefer the hardware-reported printerStatus.nozzles array length as the dual-nozzle signal -- populated regardless of AMS configuration -- and keep the ams_extruder_map branch as fallback for older firmware that might not surface nozzles. Affects all dual-nozzle printers running without AMS: X2D, H2D, X2 Pro. Regression test pins both layers the bug straddled -- buildLoadedFilaments extruderId assignment per external spool, and computeAmsMapping picking the correct external for a per-nozzle requirement -- so a future change that re-breaks either fails CI.