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The Filament Track Switch (H2-series accessory, product code O2L-FTS) feeds every AMS to both extruders through a two-track switch. Port full support across the device layer, project config, and GUI. Device / config: - Model the switch-aware AMS binding (the set of extruders an AMS can feed and which input track A/B feeds it), switch readiness, the O2L-FTS firmware module, and the fun2 capability bit for checking a slice against installed hardware. - Register has_filament_switcher and enable_filament_dynamic_map as project config that persists with the project and restores from a saved 3mf, and force both back to false on every project/printer/CLI load path. Live device sync is the only thing that sets them true. GUI: - Sidebar sync activates the switch from live device state, attributes each AMS to the extruder its input track feeds, shows a floating status icon (ready / not-calibrated), and surfaces a one-time tip / not-calibrated warning. - Send dialog gains a non-blocking slice-vs-hardware mismatch warning and a blocking error when a slice needs dynamic nozzle mapping but the switch is missing or not set up. - AMS load/unload guards, AMS-view routing glyph + un-calibrated banner + hidden external-spool road, and mapping-popup external-spool lockout. - Filament pickers collapse the per-extruder split into a single deduplicated "AMS filaments" group with a smart-assign toggle when the switch is ready. - Firmware-upgrade panel lists the O2L-FTS accessory and its version. - Device-provided filament-change steps (ams.cfs) drive the change-step display when firmware sends them, including the three switch steps. - "Load current filament" asks which extruder to feed via a FeedDirectionDialog when the switch is calibrated. Inert without the accessory: every path is gated on the switch being installed (MQTT aux bit 29, default off) or ready, both project flags default false, and the per-extruder AMS attribution is byte-identical, so AMS state, the send/load UI, and sliced g-code are unchanged for every printer that does not report a Filament Track Switch.