Initial Commit for OrcaPrinterAgent AMS Sync

scripts/test_moonraker_lane_data.py

@@ -24,7 +24,7 @@ NAMESPACE = "lane_data"
 
 # Repo-relative paths for the offline generic-map check
 REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-MOONRAKER_AGENT_CPP = os.path.join(REPO_ROOT, "src", "slic3r", "Utils", "MoonrakerPrinterAgent.cpp")
+AMS_PAYLOAD_CPP = os.path.join(REPO_ROOT, "src", "slic3r", "Utils", "AmsPayload.cpp")
 OFL_FILAMENT_DIR = os.path.join(REPO_ROOT, "resources", "profiles", "OrcaFilamentLibrary", "filament")
 LANE_KEYS = [f"lane{i}" for i in range(1, 9)]  # lane1-lane8
 MATERIALS = ["PLA", "ABS", "PETG", "ASA", "ASA Sparkle", "TPU", ""]
@@ -41,16 +41,16 @@ MATERIAL_TEMPS = {
 }
 
 def parse_cpp_type_map():
-    """Extract the normalized-type -> OFL generic family table from MoonrakerPrinterAgent.cpp.
+    """Extract the normalized-type -> OFL generic family table from AmsPayload.cpp.
 
-    Reads MoonrakerPrinterAgent::map_filament_type_to_generic_id's type_to_ofl_family
+    Reads map_filament_type_to_generic_id's type_to_ofl_family initializer so the
-    initializer so the check tracks the C++ normalization without a duplicated list.
+    check tracks the C++ normalization without a duplicated list.
     """
-    with open(MOONRAKER_AGENT_CPP, encoding="utf-8") as f:
+    with open(AMS_PAYLOAD_CPP, encoding="utf-8") as f:
         src = f.read()
     m = re.search(r"type_to_ofl_family\s*=\s*\{(.*?)\n\s*\};", src, re.DOTALL)
     if not m:
-        raise RuntimeError(f"type_to_ofl_family table not found in {MOONRAKER_AGENT_CPP}")
+        raise RuntimeError(f"type_to_ofl_family table not found in {AMS_PAYLOAD_CPP}")
     pairs = re.findall(r'\{\s*"([^"]+)"\s*,\s*"([^"]+)"\s*\}', m.group(1))
     if not pairs:
         raise RuntimeError("type_to_ofl_family table parsed empty")

src/slic3r/CMakeLists.txt

@@ -740,6 +740,8 @@ set(SLIC3R_GUI_SOURCES
     Utils/OrcaMqttConnection.hpp
     Utils/OrcaPrinterAgent.cpp
     Utils/OrcaPrinterAgent.hpp
+    Utils/AmsPayload.cpp
+    Utils/AmsPayload.hpp
     Utils/OrcaCloudSignalingChannel.cpp
     Utils/OrcaCloudSignalingChannel.hpp
     Utils/QidiPrinterAgent.cpp

src/slic3r/GUI/Plater.cpp

@@ -727,6 +727,7 @@ struct Sidebar::priv
     ScalableButton *  m_bpButton_add_filament;
     ScalableButton *  m_bpButton_del_filament;
     ScalableButton *  m_bpButton_ams_filament;
+    bool              m_ams_sync_button_show{true}; // last applied AMS sync button visibility
     ScalableButton *  m_bpButton_set_filament;
     int m_menu_filament_id = -1;
 
@@ -3427,6 +3428,22 @@ void Sidebar::remove_unused_filament_combos(const size_t current_extruder_count)
     }
 }
 
+void Sidebar::update_ams_sync_button()
+{
+    if (!p->m_bpButton_ams_filament || !wxGetApp().preset_bundle)
+        return;
+    // BBL printers always advertise AMS sync; other agents follow the active
+    // agent's filament sync mode, which flips to subscription only after the
+    // printer's get_capabilities reply arrives.
+    const bool show = wxGetApp().preset_bundle->use_bbl_network() ||
+                      (wxGetApp().getAgent() && wxGetApp().getAgent()->get_filament_sync_mode() != FilamentSyncMode::none);
+    if (p->m_ams_sync_button_show == show)
+        return;
+    p->m_ams_sync_button_show = show;
+    p->m_bpButton_ams_filament->Show(show);
+    p->m_bpButton_ams_filament->GetParent()->Layout();
+}
+
 void Sidebar::update_all_preset_comboboxes()
 {
     PresetBundle &preset_bundle = *wxGetApp().preset_bundle;
@@ -3444,7 +3461,7 @@ void Sidebar::update_all_preset_comboboxes()
         //p->btn_connect_printer->Hide();
         p->m_printer_connect->Hide();
         //only show sync-ams button for BBL printer
-        p->m_bpButton_ams_filament->Show();
+        update_ams_sync_button();
         //update print button default value for bbl or third-party printer
         p_mainframe->set_print_button_to_default(MainFrame::PrintSelectType::ePrintPlate);
     } else {
@@ -3453,11 +3470,7 @@ void Sidebar::update_all_preset_comboboxes()
         p->m_printer_connect->Show(!use_printer_agents);
 
         // ORCA: show/hide sync-ams button based on filament sync mode
-        auto agent = wxGetApp().getAgent();
+        update_ams_sync_button();
-        if (agent && agent->get_filament_sync_mode() != FilamentSyncMode::none)
-            p->m_bpButton_ams_filament->Show();
-        else
-            p->m_bpButton_ams_filament->Hide();
 
         // Orca: with "Support 3MF as gcode" (use_3mf) the local export is a .gcode.3mf bundle, so when no
         // printer host/IP is configured the default action is "Export plate sliced file" (mirrors the
@@ -22152,10 +22165,14 @@ void Plater::update_machine_sync_status()
     DeviceManager *dev_maneger = wxGetApp().getDeviceManager();
     if (!dev_maneger) {
         GUI::wxGetApp().sidebar().update_sync_status(nullptr);
+        GUI::wxGetApp().sidebar().update_ams_sync_button();
         return;
     }
     MachineObject *obj = wxGetApp().getDeviceManager()->get_selected_machine();
     GUI::wxGetApp().sidebar().update_sync_status(obj);
+    // The agent's sync mode flips once the printer's get_capabilities reply
+    // arrives; re-evaluate the filament-sync button on every device update.
+    GUI::wxGetApp().sidebar().update_ams_sync_button();
 }
 
 bool Plater::get_machine_sync_status()

src/slic3r/GUI/Plater.hpp

@@ -169,6 +169,8 @@ public:
     void init_filament_combo(PlaterPresetComboBox **combo, const int filament_idx);
     void remove_unused_filament_combos(const size_t current_extruder_count);
     void update_all_preset_comboboxes();
+    // Show/hide the AMS filament-sync button from the active agent's sync mode.
+    void update_ams_sync_button();
     //void update_partplate(PartPlateList& list);
     void update_presets(Slic3r::Preset::Type preset_type);
     //BBS

src/slic3r/Utils/AmsPayload.cpp

@@ -0,0 +1,493 @@
+#include "AmsPayload.hpp"
+
+#include "libslic3r/Preset.hpp"
+#include "libslic3r/PresetBundle.hpp"
+#include "slic3r/GUI/GUI_App.hpp"
+#include "slic3r/GUI/DeviceManager.hpp"
+#include "slic3r/GUI/DeviceCore/DevFilaSystem.h"
+#include "slic3r/GUI/DeviceCore/DevManager.h"
+#include "slic3r/GUI/DeviceCore/DevStorage.h"
+#include "slic3r/GUI/DeviceCore/DevFirmware.h"
+
+#include <boost/algorithm/string.hpp>
+#include <boost/log/trivial.hpp>
+#include <wx/thread.h>
+
+#include <algorithm>
+#include <cctype>
+#include <chrono>
+#include <cstdint>
+#include <map>
+#include <mutex>
+#include <sstream>
+
+namespace Slic3r {
+
+std::string map_filament_type_to_generic_id(const std::string& filament_type)
+{
+    std::string upper = filament_type;
+    boost::trim(upper);
+    std::transform(upper.begin(), upper.end(), upper.begin(),
+                   [](unsigned char c) { return static_cast<char>(std::toupper(c)); });
+
+    // Normalize reported material names to an OrcaFilamentLibrary generic family. The
+    // family's filament_id is resolved from the loaded system presets below rather than
+    // hardcoded, so profile id re-mints never require touching this table.
+    // scripts/test_moonraker_lane_data.py parses this initializer; keep the {"A", "B"} format.
+    static const std::map<std::string, std::string> type_to_ofl_family = {
+        // PLA variants
+        {"PLA", "PLA"},
+        {"PLA-CF", "PLA-CF"},
+        {"PLA SILK", "PLA Silk"},
+        {"PLA-SILK", "PLA Silk"},
+        {"PLA HIGH SPEED", "PLA High Speed"},
+        {"PLA-HS", "PLA High Speed"},
+        {"PLA HS", "PLA High Speed"},
+
+        // ABS/ASA variants
+        {"ABS", "ABS"},
+        {"ASA", "ASA"},
+
+        // PETG/PET variants
+        {"PETG", "PETG"},
+        {"PET", "PETG"},
+        {"PCTG", "PCTG"},
+
+        // PA/Nylon variants
+        {"PA", "PA"},
+        {"NYLON", "PA"},
+        {"PA-CF", "PA-CF"},
+        {"PPA", "PPA-CF"},
+        {"PPA-CF", "PPA-CF"},
+        {"PPA-GF", "PPA-GF"},
+
+        // PC variants
+        {"PC", "PC"},
+
+        // PP/PE variants
+        {"PE", "PE"},
+        {"PP", "PP"},
+
+        // Support materials
+        {"PVA", "PVA"},
+        {"HIPS", "HIPS"},
+        {"BVOH", "BVOH"},
+
+        // TPU variants
+        {"TPU", "TPU"},
+
+        // Other materials
+        {"EVA", "EVA"},
+        {"PHA", "PHA"},
+        {"COPE", "CoPE"},
+        {"SBS", "SBS"},
+    };
+
+    auto it = type_to_ofl_family.find(upper);
+    if (it == type_to_ofl_family.end())
+        return UNKNOWN_FILAMENT_ID;
+
+    if (auto* bundle = GUI::wxGetApp().preset_bundle) {
+        const Preset* preset = bundle->filaments.find_preset("Generic " + it->second + " @System");
+        if (preset != nullptr && preset->is_system && !preset->filament_id.empty())
+            return preset->filament_id;
+    }
+
+    // Unknown material, or no loaded preset data to resolve against
+    return UNKNOWN_FILAMENT_ID;
+}
+
+std::string normalize_ams_color(const std::string& color)
+{
+    std::string value = color;
+    boost::trim(value);
+
+    // Remove 0x or 0X prefix if present
+    if (value.size() >= 2 && (value.rfind("0x", 0) == 0 || value.rfind("0X", 0) == 0)) {
+        value = value.substr(2);
+    }
+    // Remove # prefix if present
+    if (!value.empty() && value[0] == '#') {
+        value = value.substr(1);
+    }
+
+    // Extract only hex digits
+    std::string normalized;
+    for (char c : value) {
+        if (std::isxdigit(static_cast<unsigned char>(c))) {
+            normalized.push_back(static_cast<char>(std::toupper(static_cast<unsigned char>(c))));
+        }
+    }
+
+    // If 6 hex digits, add FF alpha
+    if (normalized.size() == 6) {
+        normalized += "FF";
+    }
+
+    // Validate length - return default if invalid
+    if (normalized.size() != 8) {
+        return "00000000";
+    }
+
+    return normalized;
+}
+
+bool parse_moonraker_lane_data(const nlohmann::json& body,
+                               std::vector<AmsTrayData>& trays,
+                               int& max_lane_index)
+{
+    // Expected structure: { "result": { "namespace": "lane_data", "value": { "lane1": {...}, ... } } }
+    if (!body.is_object() || !body.contains("result") || !body["result"].is_object() ||
+        !body["result"].contains("value") || !body["result"]["value"].is_object()) {
+        BOOST_LOG_TRIVIAL(warning) << "AmsPayload: unexpected lane_data response structure";
+        return false;
+    }
+
+    const auto& value = body["result"]["value"];
+    trays.clear();
+    max_lane_index = 0;
+
+    for (const auto& lane_item : value.items()) {
+        const auto& lane_obj = lane_item.value();
+        if (!lane_obj.is_object()) {
+            continue;
+        }
+
+        // Extract lane index from the "lane" field (tool number, 0-based)
+        int lane_index = -1;
+        const auto lane_it = lane_obj.find("lane");
+        if (lane_it != lane_obj.end() && lane_it->is_string()) {
+            try {
+                lane_index = std::stoi(lane_it->get<std::string>());
+            } catch (...) {
+                lane_index = -1;
+            }
+        }
+
+        if (lane_index < 0) {
+            continue;
+        }
+
+        AmsTrayData tray;
+        tray.slot_index = lane_index;
+        if (const auto it = lane_obj.find("color"); it != lane_obj.end() && it->is_string())
+            tray.tray_color = it->get<std::string>();
+        if (const auto it = lane_obj.find("material"); it != lane_obj.end() && it->is_string())
+            tray.tray_type = it->get<std::string>();
+        if (const auto it = lane_obj.find("bed_temp"); it != lane_obj.end() && it->is_number())
+            tray.bed_temp = it->get<int>();
+        if (const auto it = lane_obj.find("nozzle_temp"); it != lane_obj.end() && it->is_number())
+            tray.nozzle_temp = it->get<int>();
+
+        // Presence is independent of declared material: a physically loaded lane
+        // with no user-declared material must not read as empty. Prefer an
+        // explicit signal, fall back to the legacy "has a material type" rule.
+        const auto has_it = lane_obj.find("has_filament");
+        const auto loaded_it = lane_obj.find("loaded");
+        if (has_it != lane_obj.end() && has_it->is_boolean())
+            tray.has_filament = has_it->get<bool>();
+        else if (loaded_it != lane_obj.end() && loaded_it->is_boolean())
+            tray.has_filament = loaded_it->get<bool>();
+        else
+            tray.has_filament = !tray.tray_type.empty();
+
+        max_lane_index = std::max(max_lane_index, lane_index);
+        trays.push_back(tray);
+    }
+
+    if (trays.empty()) {
+        BOOST_LOG_TRIVIAL(info) << "AmsPayload: no lanes found";
+        return false;
+    }
+
+    return true;
+}
+
+void resolve_tray_info_idx(std::vector<AmsTrayData>& trays)
+{
+    auto* bundle = GUI::wxGetApp().preset_bundle;
+    for (auto& tray : trays) {
+        // Absent lanes render as placeholders; resolving an empty type is busy
+        // work at best and could bind a bogus id.
+        if (!tray.has_filament)
+            continue;
+        // A vendor-aware resolver may already have matched this lane; only fill
+        // what is still empty so the generic fallback cannot overwrite it.
+        if (!tray.tray_info_idx.empty())
+            continue;
+        tray.tray_info_idx = bundle
+            ? bundle->filaments.filament_id_by_type(tray.tray_type)
+            : map_filament_type_to_generic_id(tray.tray_type);
+    }
+}
+
+nlohmann::json build_bbl_ams_json(const std::vector<AmsTrayData>& trays,
+                                  int ams_count,
+                                  int max_lane_index)
+{
+    nlohmann::json ams_array = nlohmann::json::array();
+
+    // ams_exist_bits marks the units; tray_exist_bits marks the occupied
+    // slots. uint64_t: unsigned long is 32-bit on MSVC, so 1UL << 32+ is UB.
+    // BBL's fields are 64-bit; a lane past 63 cannot be represented at all.
+    uint64_t ams_exist_bits = 0;
+    uint64_t tray_exist_bits = 0;
+
+    auto set_exist_bit = [](uint64_t& bits, int index) {
+        if (index < 0)
+            return;
+        if (index >= 64) {
+            BOOST_LOG_TRIVIAL(warning) << "AmsPayload: lane index " << index << " exceeds the 64-bit exist-bits field; bit dropped";
+            return;
+        }
+        bits |= (uint64_t{1} << index);
+    };
+
+    for (int ams_id = 0; ams_id < ams_count; ++ams_id) {
+        set_exist_bit(ams_exist_bits, ams_id);
+
+        nlohmann::json ams_unit = nlohmann::json::object();
+        ams_unit["id"] = std::to_string(ams_id);
+        ams_unit["info"] = "0002";  // treat as AMS_LITE
+
+        nlohmann::json tray_array = nlohmann::json::array();
+        int max_slot_in_this_ams = std::min(3, max_lane_index - ams_id * 4);
+        for (int slot_id = 0; slot_id <= max_slot_in_this_ams; ++slot_id) {
+            int slot_index = ams_id * 4 + slot_id;
+
+            // Find tray with matching slot_index
+            const AmsTrayData* tray = nullptr;
+            for (const auto& t : trays) {
+                if (t.slot_index == slot_index) {
+                    tray = &t;
+                    break;
+                }
+            }
+
+            nlohmann::json tray_json = nlohmann::json::object();
+            tray_json["id"] = std::to_string(slot_id);
+            tray_json["tag_uid"] = "0000000000000000";
+
+            if (tray && tray->has_filament) {
+                set_exist_bit(tray_exist_bits, slot_index);
+
+                // Present lanes never carry tray_slot_placeholder: a loaded but
+                // undeclared lane stays occupied with an empty type, which is
+                // what distinguishes it from an absent slot.
+                tray_json["tray_info_idx"] = tray->tray_info_idx;
+                tray_json["tray_type"] = tray->tray_type;
+                tray_json["tray_color"] = normalize_ams_color(tray->tray_color);
+
+                // Add temperature data if provided
+                if (tray->bed_temp > 0) {
+                    tray_json["bed_temp"] = std::to_string(tray->bed_temp);
+                }
+                if (tray->nozzle_temp > 0) {
+                    tray_json["nozzle_temp_max"] = std::to_string(tray->nozzle_temp);
+                }
+            } else {
+                tray_json["tray_info_idx"] = "";
+                tray_json["tray_type"] = "";
+                tray_json["tray_color"] = "00000000";
+                tray_json["tray_slot_placeholder"] = "1";
+            }
+
+            tray_array.push_back(tray_json);
+        }
+        ams_unit["tray"] = tray_array;
+        ams_array.push_back(ams_unit);
+    }
+
+    // Format as hex strings (matching BBL protocol)
+    std::ostringstream ams_exist_ss;
+    ams_exist_ss << std::hex << std::uppercase << ams_exist_bits;
+    std::ostringstream tray_exist_ss;
+    tray_exist_ss << std::hex << std::uppercase << tray_exist_bits;
+
+    nlohmann::json ams_json = nlohmann::json::object();
+    ams_json["ams"] = ams_array;
+    ams_json["ams_exist_bits"] = ams_exist_ss.str();
+    ams_json["tray_exist_bits"] = tray_exist_ss.str();
+    return ams_json;
+}
+
+// --- Removal/absence state and op capability ---------------------------------
+
+// Last ams_count rendered per device: clear_ams_payload_for_device walks the
+// same unit set to mark them all absent.
+static std::mutex              g_ams_state_mutex;
+static std::map<std::string, int>             g_ams_last_count;
+static std::map<std::string, std::vector<std::string>> g_ams_ops;
+static std::map<std::string, bool>            g_ams_capability;
+
+static void remember_ams_count(const std::string& dev_id, int ams_count)
+{
+    if (dev_id.empty() || ams_count <= 0)
+        return;
+    std::lock_guard<std::mutex> lock(g_ams_state_mutex);
+    g_ams_last_count[dev_id] = std::max(g_ams_last_count[dev_id], ams_count);
+}
+
+void register_ams_ops(const std::string& dev_id, const std::vector<std::string>& ops)
+{
+    if (dev_id.empty())
+        return;
+    std::lock_guard<std::mutex> lock(g_ams_state_mutex);
+    g_ams_ops[dev_id] = ops;
+}
+
+bool ams_op_supported(const std::string& dev_id, const std::string& op)
+{
+    std::lock_guard<std::mutex> lock(g_ams_state_mutex);
+    auto it = g_ams_ops.find(dev_id);
+    if (it == g_ams_ops.end())
+        return true; // no OrcaSonar capabilities seen: never gate
+    return std::find(it->second.begin(), it->second.end(), op) != it->second.end();
+}
+
+void register_ams_capability(const std::string& dev_id, bool has_ams)
+{
+    if (dev_id.empty())
+        return;
+    std::lock_guard<std::mutex> lock(g_ams_state_mutex);
+    g_ams_capability[dev_id] = has_ams;
+}
+
+bool has_ams_capability(const std::string& dev_id)
+{
+    std::lock_guard<std::mutex> lock(g_ams_state_mutex);
+    auto it = g_ams_capability.find(dev_id);
+    return it != g_ams_capability.end() && it->second;
+}
+
+void build_ams_payload_for_device(const std::string& dev_id,
+                                  const std::optional<std::string>& printer_type,
+                                  int ams_count,
+                                  int max_lane_index,
+                                  const std::vector<AmsTrayData>& trays,
+                                  const QueueOnMainFn& queue_fn,
+                                  const TrayInfoResolver& vendor_resolver)
+{
+    remember_ams_count(dev_id, ams_count);
+    // A caller on the GUI thread must mutate DeviceManager inline: invoking
+    // queue_fn (CallAfter) would defer the work until after the caller has
+    // already read DevFilaSystem. Background callers route through queue_fn.
+    const bool on_main = wxIsMainThread();
+    auto apply = [dev_id, printer_type, ams_count, max_lane_index, trays, vendor_resolver]() {
+    // Look up MachineObject via DeviceManager
+    auto* dev_manager = GUI::wxGetApp().getDeviceManager();
+    if (!dev_manager) {
+        return;
+    }
+    MachineObject* obj = dev_manager->get_my_machine(dev_id);
+    if (!obj) {
+        return;
+    }
+
+    // Resolve preset ids here: reads the GUI preset bundle, which is only safe
+    // on the main thread. trays is a copy, so mutating it is fine. The optional
+    // vendor resolver runs first; the generic resolver fills the rest.
+    std::vector<AmsTrayData> resolved = trays;
+    if (vendor_resolver)
+        vendor_resolver(resolved);
+    resolve_tray_info_idx(resolved);
+
+    // Wrap in the expected structure for ParseV1_0
+    nlohmann::json print_json = nlohmann::json::object();
+    print_json["ams"] = build_bbl_ams_json(resolved, ams_count, max_lane_index);
+
+    // Call the parser to populate DevFilaSystem
+    DevFilaSystemParser::ParseV1_0(print_json, obj, obj->GetFilaSystem().get(), false);
+    BOOST_LOG_TRIVIAL(info) << "AmsPayload: parsed " << resolved.size() << " trays";
+
+    // Set printer_type so update_sync_status() can match it against the preset's
+    // printer type. nullopt = leave it (the caller's push_status already carries
+    // it); a value = assign, including empty, preserving the old behavior.
+    if (printer_type.has_value()) {
+        obj->printer_type = *printer_type;
+    }
+
+    // Set push counters so is_info_ready() returns true for pull-mode agents.
+    if (obj->m_push_count == 0) {
+        obj->m_push_count = 1;
+    }
+    if (obj->m_full_msg_count == 0) {
+        obj->m_full_msg_count = 1;
+    }
+    obj->last_push_time = std::chrono::system_clock::now();
+
+    // Set storage state - Moonraker printers use virtual_sdcard, storage is always available.
+    // This is required for SelectMachineDialog to allow printing (otherwise it blocks with "No SD card").
+    obj->GetStorage()->set_sdcard_state(DevStorage::HAS_SDCARD_NORMAL);
+
+    // Populate module_vers so is_info_ready() passes the version check.
+    if (obj->module_vers.empty()) {
+        DevFirmwareVersionInfo ota_info;
+        ota_info.name = "ota";
+        ota_info.sw_ver = "1.0.0";  // Placeholder version
+        obj->module_vers.emplace("ota", ota_info);
+    }
+    };
+
+    if (queue_fn && !on_main) {
+        queue_fn(apply);
+    } else {
+        apply();
+    }
+}
+
+void clear_ams_payload_for_device(const std::string& dev_id, const QueueOnMainFn& queue_fn)
+{
+    int count = 0;
+    {
+        std::lock_guard<std::mutex> lock(g_ams_state_mutex);
+        auto it = g_ams_last_count.find(dev_id);
+        if (it != g_ams_last_count.end())
+            count = it->second;
+        g_ams_last_count[dev_id] = 0;
+    }
+    if (count == 0)
+        return; // nothing was ever rendered: nothing to clear
+
+    const bool on_main = wxIsMainThread();
+    auto apply = [dev_id, count]() {
+        auto* dev_manager = GUI::wxGetApp().getDeviceManager();
+        if (!dev_manager)
+            return;
+        MachineObject* obj = dev_manager->get_my_machine(dev_id);
+        if (!obj)
+            return;
+
+        // All units present-but-empty: exist bits 0 marks them absent while
+        // placeholder trays flush stale type/color data out of DevFilaSystem.
+        nlohmann::json units = nlohmann::json::array();
+        for (int ams_id = 0; ams_id < count; ++ams_id) {
+            nlohmann::json trays = nlohmann::json::array();
+            for (int slot_id = 0; slot_id < 4; ++slot_id) {
+                trays.push_back(nlohmann::json{
+                    {"id", std::to_string(slot_id)},
+                    {"tag_uid", "0000000000000000"},
+                    {"tray_info_idx", ""},
+                    {"tray_type", ""},
+                    {"tray_color", "00000000"},
+                    {"tray_slot_placeholder", "1"},
+                });
+            }
+            units.push_back(nlohmann::json{{"id", std::to_string(ams_id)}, {"info", "0002"}, {"tray", trays}});
+        }
+        nlohmann::json ams_json;
+        ams_json["ams"]                = units;
+        ams_json["ams_exist_bits"]     = "0";
+        ams_json["tray_exist_bits"]    = "0";
+        nlohmann::json print_json;
+        print_json["ams"] = ams_json;
+        DevFilaSystemParser::ParseV1_0(print_json, obj, obj->GetFilaSystem().get(), false);
+        BOOST_LOG_TRIVIAL(info) << "AmsPayload: cleared " << count << " AMS units for " << dev_id;
+    };
+    if (queue_fn && !on_main)
+        queue_fn(apply);
+    else
+        apply();
+}
+
+} // namespace Slic3r

src/slic3r/Utils/AmsPayload.hpp

@@ -0,0 +1,93 @@
+#ifndef __AMS_PAYLOAD_HPP__
+#define __AMS_PAYLOAD_HPP__
+
+#include "bambu_networking.hpp"
+
+#include <functional>
+#include <nlohmann/json.hpp>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace Slic3r {
+
+// One lane of a multi-material system in the neutral shape every printer agent
+// shares before it is rendered into the BBL AMS payload.
+struct AmsTrayData {
+    int         slot_index = 0;      // 0-based global slot index
+    bool        has_filament = false;
+    std::string tray_type;           // Material type (e.g. "PLA", "ASA")
+    std::string tray_color;          // Raw color (#RRGGBB, 0xRRGGBB, or RRGGBBAA)
+    std::string tray_info_idx;       // OrcaFilamentLibrary preset id (optional)
+    int         bed_temp = 0;        // Optional
+    int         nozzle_temp = 0;     // Optional
+};
+
+// Normalize a driver color string to the BBL RRGGBBAA form; "00000000" when invalid.
+std::string normalize_ams_color(const std::string& color);
+
+// Map a reported material type to an OrcaFilamentLibrary generic family id.
+std::string map_filament_type_to_generic_id(const std::string& filament_type);
+
+// Parse a Moonraker `/server/database/item?namespace=lane_data` response body:
+// result.value is keyed by lane, each entry carrying "lane", optional
+// "material"/"color"/"bed_temp"/"nozzle_temp" and an optional presence signal
+// ("has_filament" or "loaded"). Presence is preferred over material: a loaded
+// lane with no declared material must not read as empty. Returns false when
+// malformed or empty. Pure: tray_info_idx is left for resolve_tray_info_idx().
+bool parse_moonraker_lane_data(const nlohmann::json& body,
+                               std::vector<AmsTrayData>& trays,
+                               int& max_lane_index);
+
+// Fill each tray's tray_info_idx from the loaded preset bundle (falling back to
+// the generic family map). Reads GUI preset state, so it MUST run on the main
+// thread. Ids already set by a vendor-aware resolver are left untouched.
+void resolve_tray_info_idx(std::vector<AmsTrayData>& trays);
+
+// Optional vendor-aware resolver, run on the main thread before the generic
+// resolver. Agents with brand/color matching (Snapmaker, Creality) supply one
+// so their results survive the shared path; the generic resolver only fills
+// ids this leaves empty.
+using TrayInfoResolver = std::function<void(std::vector<AmsTrayData>&)>;
+
+// Assemble the BBL-format AMS JSON (ams[] units + ams_exist_bits/tray_exist_bits)
+// that DevFilaSystemParser::ParseV1_0 consumes. Pure and GUI-free: the
+// MachineObject mutation stays in build_ams_payload_for_device.
+nlohmann::json build_bbl_ams_json(const std::vector<AmsTrayData>& trays,
+                                  int ams_count,
+                                  int max_lane_index);
+
+// Render trays into the BBL AMS payload and populate the device's DevFilaSystem.
+// The resolver and the MachineObject mutation both run on the main thread via
+// queue_fn when set. printer_type: nullopt leaves obj->printer_type untouched
+// (OrcaSonar, whose push_status already carries it); a value assigns it
+// verbatim (Moonraker).
+void build_ams_payload_for_device(const std::string& dev_id,
+                                  const std::optional<std::string>& printer_type,
+                                  int ams_count,
+                                  int max_lane_index,
+                                  const std::vector<AmsTrayData>& trays,
+                                  const QueueOnMainFn& queue_fn,
+                                  const TrayInfoResolver& vendor_resolver = {});
+
+// Clear the device's AMS view: render every previously-seen unit as absent
+// with placeholder trays so a removed/absent material system never leaves
+// stale filament data behind (lane_data read as authoritative empty).
+void clear_ams_payload_for_device(const std::string& dev_id, const QueueOnMainFn& queue_fn);
+
+// Process-wide canonical AMS write capability (OrcaSonar REQ-STS-008), parsed
+// from the info.get_capabilities reply. Devices with no record (Bambu, cloud
+// profiles) report every op supported: gating only ever applies to OrcaSonar
+// printers that answered.
+void   register_ams_ops(const std::string& dev_id, const std::vector<std::string>& ops);
+bool   ams_op_supported(const std::string& dev_id, const std::string& op);
+
+// Whether the device has a material system, from the get_capabilities reply's
+// protocol.features.fms (falling back to a non-empty ams_ops). No record reads
+// false: an unconfirmed printer must not advertise filament sync.
+void   register_ams_capability(const std::string& dev_id, bool has_ams);
+bool   has_ams_capability(const std::string& dev_id);
+
+} // namespace Slic3r
+
+#endif

src/slic3r/Utils/MoonrakerPrinterAgent.cpp

@@ -533,142 +533,27 @@ int MoonrakerPrinterAgent::set_queue_on_main_fn(QueueOnMainFn fn)
 
 void MoonrakerPrinterAgent::build_ams_payload(int ams_count, int max_lane_index, const std::vector<AmsTrayData>& trays)
 {
-    // This may be called from a background thread (e.g. run_status_stream's read loop,
+    // May run from the status-stream thread (subscription agents) or the GUI
-    // for subscription-mode agents) as well as from the GUI thread (Sidebar's pull-mode
+    // thread (Sidebar's pull path). Snapshot queue_on_main_fn here; the shared
-    // path). Everything below touches MachineObject/DevFilaSystem, which the GUI thread
+    // builder defers the preset lookup and MachineObject mutation to the main
-    // reads without locking — so the actual mutation must run on the main thread. Snapshot
+    // thread. A heavy-handed empty model_id must still be assigned, so the
-    // queue_on_main_fn and the two device_info fields we need up front, then defer the rest,
+    // optional wrapper always carries the value here.
-    // mirroring dispatch_message's existing queue_fn ? queue_fn(x) : x() idiom.
     QueueOnMainFn queue_fn;
     {
         std::lock_guard<std::recursive_mutex> lock(state_mutex);
         queue_fn = queue_on_main_fn;
     }
-
+    build_ams_payload_for_device(device_info.dev_id, std::optional<std::string>(device_info.model_id), ams_count, max_lane_index, trays, queue_fn);
-    std::string dev_id   = device_info.dev_id;
-    std::string model_id = device_info.model_id;
-
-    auto apply = [dev_id, model_id, ams_count, max_lane_index, trays]() {
-    // Look up MachineObject via DeviceManager
-    auto* dev_manager = GUI::wxGetApp().getDeviceManager();
-    if (!dev_manager) {
-        return;
-    }
-    MachineObject* obj = dev_manager->get_my_machine(dev_id);
-    if (!obj) {
-        return;
 }
 
-    // Build BBL-format JSON for DevFilaSystemParser::ParseV1_0
+void MoonrakerPrinterAgent::build_ams_payload(int ams_count, int max_lane_index, const std::vector<AmsTrayData>& trays, const TrayInfoResolver& vendor_resolver)
-    nlohmann::json ams_json = nlohmann::json::object();
+{
-    nlohmann::json ams_array = nlohmann::json::array();
+    QueueOnMainFn queue_fn;
-
+    {
-    // Calculate ams_exist_bits and tray_exist_bits
+        std::lock_guard<std::recursive_mutex> lock(state_mutex);
-    unsigned long ams_exist_bits = 0;
+        queue_fn = queue_on_main_fn;
-    unsigned long tray_exist_bits = 0;
-
-    for (int ams_id = 0; ams_id < ams_count; ++ams_id) {
-        ams_exist_bits |= (1 << ams_id);
-
-        nlohmann::json ams_unit = nlohmann::json::object();
-        ams_unit["id"] = std::to_string(ams_id);
-        ams_unit["info"] = "0002";  // treat as AMS_LITE 
-
-        nlohmann::json tray_array = nlohmann::json::array();
-        int max_slot_in_this_ams = std::min(3, max_lane_index - ams_id * 4);
-        for (int slot_id = 0; slot_id <= max_slot_in_this_ams; ++slot_id) {
-            int slot_index = ams_id * 4 + slot_id;
-
-            // Find tray with matching slot_index
-            const AmsTrayData* tray = nullptr;
-            for (const auto& t : trays) {
-                if (t.slot_index == slot_index) {
-                    tray = &t;
-                    break;
-                }
-            }
-
-            nlohmann::json tray_json = nlohmann::json::object();
-            tray_json["id"] = std::to_string(slot_id);
-            tray_json["tag_uid"] = "0000000000000000";
-
-            if (tray && tray->has_filament) {
-                tray_exist_bits |= (1 << slot_index);
-
-                tray_json["tray_info_idx"] = tray->tray_info_idx;
-                tray_json["tray_type"] = tray->tray_type;
-                tray_json["tray_color"] = normalize_color_value(tray->tray_color);
-
-                // Add temperature data if provided
-                if (tray->bed_temp > 0) {
-                    tray_json["bed_temp"] = std::to_string(tray->bed_temp);
-                }
-                if (tray->nozzle_temp > 0) {
-                    tray_json["nozzle_temp_max"] = std::to_string(tray->nozzle_temp);
-                }
-            } else {
-                tray_json["tray_info_idx"] = "";
-                tray_json["tray_type"] = "";
-                tray_json["tray_color"] = "00000000";
-                tray_json["tray_slot_placeholder"] = "1";
-            }
-
-            tray_array.push_back(tray_json);
-        }
-        ams_unit["tray"] = tray_array;
-        ams_array.push_back(ams_unit);
-    }
-
-    // Format as hex strings (matching BBL protocol)
-    std::ostringstream ams_exist_ss;
-    ams_exist_ss << std::hex << std::uppercase << ams_exist_bits;
-    std::ostringstream tray_exist_ss;
-    tray_exist_ss << std::hex << std::uppercase << tray_exist_bits;
-
-    ams_json["ams"] = ams_array;
-    ams_json["ams_exist_bits"] = ams_exist_ss.str();
-    ams_json["tray_exist_bits"] = tray_exist_ss.str();
-
-    // Wrap in the expected structure for ParseV1_0
-    nlohmann::json print_json = nlohmann::json::object();
-    print_json["ams"] = ams_json;
-
-    // Call the parser to populate DevFilaSystem
-    DevFilaSystemParser::ParseV1_0(print_json, obj, obj->GetFilaSystem().get(), false);
-    BOOST_LOG_TRIVIAL(info) << "MoonrakerPrinterAgent::build_ams_payload: Parsed " << trays.size() << " trays";
-
-    // Set printer_type so update_sync_status() can match it against the preset's printer type.
-    // Without this, the comparison fails and all sync badges are cleared.
-    obj->printer_type = model_id;
-
-    // Set push counters so is_info_ready() returns true for pull-mode agents.
-    if (obj->m_push_count == 0) {
-        obj->m_push_count = 1;
-    }
-    if (obj->m_full_msg_count == 0) {
-        obj->m_full_msg_count = 1;
-    }
-    obj->last_push_time = std::chrono::system_clock::now();
-
-    // Set storage state - Moonraker printers use virtual_sdcard, storage is always available.
-    // This is required for SelectMachineDialog to allow printing (otherwise it blocks with "No SD card").
-    obj->GetStorage()->set_sdcard_state(DevStorage::HAS_SDCARD_NORMAL);
-
-    // Populate module_vers so is_info_ready() passes the version check.
-    // Moonraker printers don't have BBL-style version info, but we need a non-empty map.
-    if (obj->module_vers.empty()) {
-        DevFirmwareVersionInfo ota_info;
-        ota_info.name = "ota";
-        ota_info.sw_ver = "1.0.0";  // Placeholder version for Moonraker printers
-        obj->module_vers.emplace("ota", ota_info);
-    }
-    };
-
-    if (queue_fn) {
-        queue_fn(apply);
-    } else {
-        apply();
     }
+    build_ams_payload_for_device(device_info.dev_id, std::optional<std::string>(device_info.model_id), ams_count, max_lane_index, trays, queue_fn, vendor_resolver);
 }
 
 bool MoonrakerPrinterAgent::fetch_filament_info(std::string dev_id, FilamentSyncMode sync_mode)
@@ -764,94 +649,7 @@ std::string MoonrakerPrinterAgent::trim_and_upper(const std::string& input)
     return result;
 }
 
-std::string MoonrakerPrinterAgent::map_filament_type_to_generic_id(const std::string& filament_type)
-{
-    const std::string upper = trim_and_upper(filament_type);
-
-    // Normalize reported material names (trimmed, uppercased) to an OrcaFilamentLibrary
-    // generic family. The family's filament_id is resolved from the loaded system presets
-    // below rather than hardcoded, so profile id re-mints never require touching this table.
-    // scripts/test_moonraker_lane_data.py parses this initializer; keep the {"A", "B"} format.
-    static const std::map<std::string, std::string> type_to_ofl_family = {
-        // PLA variants
-        {"PLA", "PLA"},
-        {"PLA-CF", "PLA-CF"},
-        {"PLA SILK", "PLA Silk"},
-        {"PLA-SILK", "PLA Silk"},
-        {"PLA HIGH SPEED", "PLA High Speed"},
-        {"PLA-HS", "PLA High Speed"},
-        {"PLA HS", "PLA High Speed"},
-
-        // ABS/ASA variants
-        {"ABS", "ABS"},
-        {"ASA", "ASA"},
-
-        // PETG/PET variants
-        {"PETG", "PETG"},
-        {"PET", "PETG"},
-        {"PCTG", "PCTG"},
-
-        // PA/Nylon variants
-        {"PA", "PA"},
-        {"NYLON", "PA"},
-        {"PA-CF", "PA-CF"},
-        {"PPA", "PPA-CF"},
-        {"PPA-CF", "PPA-CF"},
-        {"PPA-GF", "PPA-GF"},
-
-        // PC variants
-        {"PC", "PC"},
-
-        // PP/PE variants
-        {"PE", "PE"},
-        {"PP", "PP"},
-
-        // Support materials
-        {"PVA", "PVA"},
-        {"HIPS", "HIPS"},
-        {"BVOH", "BVOH"},
-
-        // TPU variants
-        {"TPU", "TPU"},
-
-        // Other materials
-        {"EVA", "EVA"},
-        {"PHA", "PHA"},
-        {"COPE", "CoPE"},
-        {"SBS", "SBS"},
-    };
-
-    auto it = type_to_ofl_family.find(upper);
-    if (it == type_to_ofl_family.end())
-        return UNKNOWN_FILAMENT_ID;
-
-    if (auto* bundle = GUI::wxGetApp().preset_bundle) {
-        const Preset* preset = bundle->filaments.find_preset("Generic " + it->second + " @System");
-        if (preset != nullptr && preset->is_system && !preset->filament_id.empty())
-            return preset->filament_id;
-    }
-
-    // Unknown material, or no loaded preset data to resolve against
-    return UNKNOWN_FILAMENT_ID;
-}
-
 // JSON helper methods - null-safe accessors
-std::string MoonrakerPrinterAgent::safe_json_string(const nlohmann::json& obj, const char* key)
-{
-    auto it = obj.find(key);
-    if (it != obj.end() && it->is_string())
-        return it->get<std::string>();
-    return "";
-}
-
-int MoonrakerPrinterAgent::safe_json_int(const nlohmann::json& obj, const char* key)
-{
-    auto it = obj.find(key);
-    if (it != obj.end() && it->is_number())
-        return it->get<int>();
-    return 0;
-}
-
 std::string MoonrakerPrinterAgent::safe_array_string(const nlohmann::json& arr, int idx)
 {
     if (arr.is_array() && idx >= 0 && idx < static_cast<int>(arr.size()) && arr[idx].is_string())
@@ -866,41 +664,6 @@ int MoonrakerPrinterAgent::safe_array_int(const nlohmann::json& arr, int idx)
     return 0;
 }
 
-std::string MoonrakerPrinterAgent::normalize_color_value(const std::string& color)
-{
-    std::string value = color;
-    boost::trim(value);
-
-    // Remove 0x or 0X prefix if present
-    if (value.size() >= 2 && (value.rfind("0x", 0) == 0 || value.rfind("0X", 0) == 0)) {
-        value = value.substr(2);
-    }
-    // Remove # prefix if present
-    if (!value.empty() && value[0] == '#') {
-        value = value.substr(1);
-    }
-
-    // Extract only hex digits
-    std::string normalized;
-    for (char c : value) {
-        if (std::isxdigit(static_cast<unsigned char>(c))) {
-            normalized.push_back(static_cast<char>(std::toupper(static_cast<unsigned char>(c))));
-        }
-    }
-
-    // If 6 hex digits, add FF alpha
-    if (normalized.size() == 6) {
-        normalized += "FF";
-    }
-
-    // Validate length - return default if invalid
-    if (normalized.size() != 8) {
-        return "00000000";
-    }
-
-    return normalized;
-}
-
 // Fetch filament info from moonraker database
 bool MoonrakerPrinterAgent::fetch_moonraker_filament_data(std::vector<AmsTrayData>& trays, int& max_lane_index)
 {
@@ -945,56 +708,11 @@ bool MoonrakerPrinterAgent::fetch_moonraker_filament_data(std::vector<AmsTrayDat
     }
 
     // Expected structure: { "result": { "namespace": "lane_data", "value": { "lane1": {...}, ... } } }
-    if (!json.contains("result") || !json["result"].contains("value") || !json["result"]["value"].is_object()) {
+    if (!parse_moonraker_lane_data(json, trays, max_lane_index)) {
-        BOOST_LOG_TRIVIAL(warning) << "MoonrakerPrinterAgent::fetch_moonraker_filament_data: Unexpected JSON structure or no lane_data found";
-        return false;
-    }
-
-    // Parse response into AmsTrayData
-    const auto& value = json["result"]["value"];
-    trays.clear();
-    max_lane_index = 0;
-
-    for (const auto& [lane_key, lane_obj] : value.items()) {
-        if (!lane_obj.is_object()) {
-            continue;
-        }
-
-        // Extract lane index from the "lane" field (tool number, 0-based)
-        std::string lane_str = safe_json_string(lane_obj, "lane");
-        int lane_index = -1;
-        if (!lane_str.empty()) {
-            try {
-                lane_index = std::stoi(lane_str);
-            } catch (...) {
-                lane_index = -1;
-            }
-        }
-
-        if (lane_index < 0) {
-            continue;
-        }
-
-        AmsTrayData tray;
-        tray.slot_index = lane_index;
-        tray.tray_color = safe_json_string(lane_obj, "color");
-        tray.tray_type = safe_json_string(lane_obj, "material");
-        tray.bed_temp = safe_json_int(lane_obj, "bed_temp");
-        tray.nozzle_temp = safe_json_int(lane_obj, "nozzle_temp");
-        tray.has_filament = !tray.tray_type.empty();
-        auto* bundle = GUI::wxGetApp().preset_bundle;
-        tray.tray_info_idx = bundle
-            ? bundle->filaments.filament_id_by_type(tray.tray_type)
-            : map_filament_type_to_generic_id(tray.tray_type);
-
-        max_lane_index = std::max(max_lane_index, lane_index);
-        trays.push_back(tray);
-    }
-
-    if (trays.empty()) {
-        BOOST_LOG_TRIVIAL(info) << "MoonrakerPrinterAgent::fetch_moonraker_filament_data: No lanes found";
         return false;
     }
+    // tray_info_idx is resolved later, on the main thread, inside
+    // build_ams_payload_for_device.
 
     return true;
 }
@@ -1110,11 +828,6 @@ bool MoonrakerPrinterAgent::fetch_hh_filament_info(std::vector<AmsTrayData>& tra
         tray.bed_temp = 0;  // HH doesn't provide bed temp in gate arrays
         tray.has_filament = true;
 
-        auto* bundle = GUI::wxGetApp().preset_bundle;
-        tray.tray_info_idx = bundle
-            ? bundle->filaments.filament_id_by_type(tray.tray_type)
-            : map_filament_type_to_generic_id(tray.tray_type);
-
         max_lane_index = std::max(max_lane_index, gate_idx);
         trays.push_back(tray);
     }

src/slic3r/Utils/MoonrakerPrinterAgent.hpp

@@ -3,6 +3,7 @@
 
 #include "IPrinterAgent.hpp"
 #include "ICloudServiceAgent.hpp"
+#include "AmsPayload.hpp"
 
 #include <memory>
 #include <mutex>
@@ -84,19 +85,12 @@ protected:
         bool        use_ssl = false;
     } device_info;
 
-    // Tray data for AMS payload building
+    // Build ams JSON and call parser (AmsTrayData is shared; see AmsPayload.hpp).
-    struct AmsTrayData {
-        int         slot_index = 0;      // 0-based slot index
-        bool        has_filament = false;
-        std::string tray_type;           // Material type (e.g., "PLA", "ASA")
-        std::string tray_color;          // Raw color (#RRGGBB, 0xRRGGBB, or RRGGBBAA)
-        std::string tray_info_idx;       // Setting ID (optional)
-        int         bed_temp = 0;        // Optional
-        int         nozzle_temp = 0;     // Optional
-    };
-
-    // Build ams JSON and call parser
     void build_ams_payload(int ams_count, int max_lane_index, const std::vector<AmsTrayData>& trays);
+    // Overload for agents with vendor-aware matching (Snapmaker): the resolver
+    // runs on the main thread inside the shared builder, preserving the match
+    // without touching preset state on the fetch worker.
+    void build_ams_payload(int ams_count, int max_lane_index, const std::vector<AmsTrayData>& trays, const TrayInfoResolver& vendor_resolver);
 
     // Methods that derived classes may need to override or access
     virtual bool init_device_info(std::string dev_id, std::string dev_ip, std::string username, std::string password, bool use_ssl);
@@ -121,9 +115,6 @@ protected:
     // Trim whitespace and convert to uppercase
     static std::string trim_and_upper(const std::string& input);
 
-    // Map filament type to OrcaFilamentLibrary preset ID for AMS sync compatibility
-    static std::string map_filament_type_to_generic_id(const std::string& filament_type);
-
     // Send a G-code script via Moonraker (/printer/gcode/script)
     bool send_gcode(const std::string& dev_id, const std::string& gcode) const;
     bool send_gcode(const std::string& dev_id, const std::string& gcode,
@@ -188,11 +179,8 @@ private:
     bool fetch_moonraker_filament_data(std::vector<AmsTrayData>& trays, int& max_lane_index);
 
     // JSON helper methods
-    static std::string safe_json_string(const nlohmann::json& obj, const char* key);
-    static int safe_json_int(const nlohmann::json& obj, const char* key);
     static std::string safe_array_string(const nlohmann::json& arr, int idx);
     static int safe_array_int(const nlohmann::json& arr, int idx);
-    static std::string normalize_color_value(const std::string& color);
 
     std::string                        ssdp_announced_host;
     std::string                        ssdp_announced_id;

src/slic3r/Utils/OrcaPrinterAgent.cpp

@@ -1,5 +1,6 @@
 #include "OrcaPrinterAgent.hpp"
 #include "OrcaCloudSignalingChannel.hpp"
+#include "AmsPayload.hpp"
 #include "Http.hpp"
 #include "IPrinterAgent.hpp"
 #include "NetworkAgentFactory.hpp"
@@ -448,6 +449,15 @@ OrcaPrinterAgent::~OrcaPrinterAgent()
     start_discovery(false, false);
     ++m_lan_generation; // fence any late worker callback
     ++m_cloud_generation;
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        m_shutting_down = true; // workers stop arming new HTTP fetches
+    }
+
+    // Drain the detached filament-refresh workers: the flag and generation bump
+    // above end their loops, so this waits at most one in-flight HTTP fetch.
+    while (m_filament_in_flight.load() > 0)
+        std::this_thread::sleep_for(std::chrono::milliseconds(20));
 
     // Drop the cloud status callback before anything else: it holds `this`, and the
     // cloud agent outlives the printer agent (NetworkAgent::set_printer_agent swaps
@@ -590,13 +600,46 @@ std::string OrcaPrinterAgent::merge_capabilities(const std::string& dev_id, cons
             std::lock_guard<std::mutex> l(nozzle_diameter_cache_mutex);
             nozzle_diameter_cache[dev_id] = nozzle_dia;
         }
-        // The capabilities reply itself is forwarded unchanged.
+        // The capabilities reply itself is forwarded unchanged. Its declared
+        // ams_ops (OPCP §7.8) gate every AMS control, and protocol.features.fms
+        // declares whether a material system actually exists.
+        {
+            const auto caps_it = info_it->find("capabilities");
+            if (caps_it != info_it->end() && caps_it->is_object()) {
+                const auto proto_it = caps_it->find("protocol");
+                if (proto_it != caps_it->end() && proto_it->is_object()) {
+                    const auto ops_it = proto_it->find("ams_ops");
+                    std::vector<std::string> ops;
+                    if (ops_it != proto_it->end() && ops_it->is_array()) {
+                        for (const auto& op : *ops_it)
+                            if (op.is_string())
+                                ops.push_back(op.get<std::string>());
+                        register_ams_ops(dev_id, ops);
                     }
-    else {
-        const auto print_it = envelope.find("print");
-        if (print_it != envelope.end() && print_it->is_object() &&
-            print_it->value("command", "") == "push_status" && !print_it->contains("nozzle_diameter")) {
 
+                    // features.fms is the authoritative "has a material system"
+                    // flag (topology.material_units non-empty). Payloads without
+                    // it fall back to a non-empty ams_ops.
+                    bool has_ams           = false;
+                    bool fms_known         = false;
+                    const auto features_it = proto_it->find("features");
+                    if (features_it != proto_it->end() && features_it->is_object()) {
+                        const auto fms_it = features_it->find("fms");
+                        if (fms_it != features_it->end() && fms_it->is_boolean()) {
+                            has_ams   = fms_it->get<bool>();
+                            fms_known = true;
+                        }
+                    }
+                    if (!fms_known)
+                        has_ams = !ops.empty();
+                    register_ams_capability(dev_id, has_ams);
+                }
+            }
+        }
+    } else {
+        const auto print_it = envelope.find("print");
+        if (print_it != envelope.end() && print_it->is_object() && print_it->value("command", "") == "push_status" &&
+            !print_it->contains("nozzle_diameter")) {
             double nozzle_dia = 0.0;
             {
                 std::lock_guard<std::mutex> l(nozzle_diameter_cache_mutex);
@@ -618,6 +661,11 @@ std::string OrcaPrinterAgent::merge_capabilities(const std::string& dev_id, cons
 
 void OrcaPrinterAgent::deliver_to_sink(const std::string& dev_id, const std::string& payload, bool local)
 {
+    // Subscription doorbell, on the raw payload before the UI marshal so the
+    // (possibly blocking) lane_data refresh never queues behind it.
+    if (local && filament_doorbell_needed(dev_id, payload))
+        request_filament_refresh(dev_id);
+
     parse_ipcam_info(dev_id, payload);
     std::string merged_payload = merge_capabilities(dev_id, payload);
 
@@ -629,10 +677,11 @@ void OrcaPrinterAgent::deliver_to_sink(const std::string& dev_id, const std::str
         q  = queue_on_main_fn;
     }
     BOOST_LOG_TRIVIAL(info) << "Orca diagnostic: delivering " << (local ? "local" : "cloud") << " report payload dev_id=" << dev_id
-                            << " payload=" << merged_payload
+                            << " payload=" << merged_payload << " callback=" << (fn ? "set" : "null")
-                            << " callback=" << (fn ? "set" : "null") << " queue_on_main=" << (q ? "set" : "null");
+                            << " queue_on_main=" << (q ? "set" : "null");
     if (!fn) {
-        BOOST_LOG_TRIVIAL(warning) << "Orca diagnostic: dropping " << (local ? "local" : "cloud") << " message because on_message_fn is not set"
+        BOOST_LOG_TRIVIAL(warning) << "Orca diagnostic: dropping " << (local ? "local" : "cloud")
+                                   << " message because on_message_fn is not set"
                                    << " dev_id=" << dev_id;
         return;
     }
@@ -654,6 +703,20 @@ void OrcaPrinterAgent::dispatch_local_connect(int state, const std::string& dev_
 
     BOOST_LOG_TRIVIAL(info) << "Orca diagnostic: LAN connection callback state=" << state << " dev_id=" << dev_id << " message=" << message
                             << " callback=" << (callback ? "set" : "null") << " queue_on_main=" << (queue ? "set" : "null");
+
+    // Eager filament sync on every (re)connect, like the Moonraker agents: the
+    // cached DevFilaSystem may predate the drop. The doorbell cache resets too,
+    // so the post-connect frame re-arms if the lane content moved meanwhile.
+    // Runs before the callback check so it also fires when no GUI listener is
+    // installed yet.
+    if (state == ConnectStatusOk) {
+        {
+            std::lock_guard<std::mutex> lock(state_mutex);
+            m_material_hash.clear();
+        }
+        request_filament_refresh(dev_id);
+    }
+
     if (!callback)
         return;
 
@@ -745,7 +808,9 @@ int OrcaPrinterAgent::command_ams_select_tray(std::string dev_id, std::string tr
     nlohmann::json j;
     j["print"]["command"]     = "ams_change_filament";
     j["print"]["sequence_id"] = std::to_string(sequence_id);
-    j["print"]["target"]      = tray_number;
+    // tray_id here is the flat global lane (DevFilaSystem slot index).
+    j["print"]["selector"] = "lane";
+    j["print"]["lane"]     = tray_number;
     return route_send(lan_mode, dev_id, j.dump());
 }
 
@@ -843,6 +908,240 @@ int OrcaPrinterAgent::command_axis_control(std::string dev_id,
     return route_send(lan_mode, dev_id, j.dump());
 }
 
+FilamentSyncMode OrcaPrinterAgent::get_filament_sync_mode() const
+{
+    std::string dev_id;
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        dev_id = (m_current_connection == LAN) ? m_lan_dev_id : selected_machine;
+    }
+    if (!dev_id.empty() && has_ams_capability(dev_id)) {
+        return FilamentSyncMode::subscription;
+    }
+    return FilamentSyncMode::none;
+}
+
+bool OrcaPrinterAgent::fetch_filament_info(std::string dev_id, FilamentSyncMode sync_mode)
+{
+    if (sync_mode != get_filament_sync_mode())
+        return false;
+    return fetch_lane_data(dev_id) == LaneDataState::synced;
+}
+
+// Read the lane_data projection once and apply the REQ-STS-007 tri-state to
+// DevFilaSystem. Only LaneDataState::error arms the retry latch: 404 means
+// "not knowable yet" (pre-bootstrap or acknowledged-unknown topology) and {}
+// means "authoritatively no lanes" — both are settled states, and a printer
+// without a material system must not turn into a per-frame 404 poll.
+OrcaPrinterAgent::LaneDataState OrcaPrinterAgent::fetch_lane_data(const std::string& dev_id)
+{
+    std::string origin;
+    QueueOnMainFn queue_fn;
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        if (m_shutting_down || m_current_connection != LAN || m_lan_dev_id != dev_id)
+            return LaneDataState::unknown;
+        origin   = m_lan_http_origin;
+        queue_fn = queue_on_main_fn;
+    }
+    if (origin.empty())
+        return LaneDataState::unknown;
+    const std::string api_key = lan_api_key(origin);
+
+    // OrcaSonar serves the canonical topology's lane projection on its
+    // Moonraker-compatible façade. Called on the refresh worker (subscription
+    // mode), so the payload mutation is marshalled onto the main thread through
+    // queue_fn; a GUI-thread caller reads DevFilaSystem inline.
+    const std::string url = origin + "/server/database/item?namespace=lane_data";
+
+    std::string response_body;
+    unsigned http_status = 0;
+    bool transport_error = false;
+    std::string http_error;
+    auto http = Http::get(url);
+    if (!api_key.empty())
+        http.header("X-Api-Key", api_key);
+    http.timeout_connect(5)
+        .timeout_max(10)
+        .on_complete([&](std::string body, unsigned status) {
+            http_status = status;
+            if (status == 200) {
+                response_body = std::move(body);
+            } else {
+                http_error = "HTTP error: " + std::to_string(status);
+            }
+        })
+        .on_error([&](std::string, std::string err, unsigned status) {
+            transport_error = true;
+            http_status     = status;
+            http_error      = err;
+            if (status > 0)
+                http_error += " (HTTP " + std::to_string(status) + ")";
+        })
+        .perform_sync();
+
+    if (http_status == 404 && !transport_error) {
+        BOOST_LOG_TRIVIAL(info) << "OrcaPrinterAgent::fetch_lane_data: lane_data not served yet (unknown topology)";
+        return LaneDataState::unknown;
+    }
+    if (http_status != 200) {
+        BOOST_LOG_TRIVIAL(info) << "OrcaPrinterAgent::fetch_lane_data: lane_data fetch failed: " << http_error;
+        return LaneDataState::error;
+    }
+
+    auto json = nlohmann::json::parse(response_body, nullptr, false, true);
+    if (json.is_discarded()) {
+        BOOST_LOG_TRIVIAL(warning) << "OrcaPrinterAgent::fetch_lane_data: invalid lane_data JSON";
+        return LaneDataState::error;
+    }
+    const bool empty_value = json.is_object() && json.contains("result") && json["result"].is_object() &&
+                             json["result"].contains("value") && json["result"]["value"].is_object() && json["result"]["value"].empty();
+    if (empty_value) {
+        // Authoritative empty: flush stale trays so a removed AMS does not
+        // linger in the device panel.
+        clear_ams_payload_for_device(dev_id, queue_fn);
+        return LaneDataState::none;
+    }
+
+    std::vector<AmsTrayData> trays;
+    int max_lane_index = 0;
+    if (!parse_moonraker_lane_data(json, trays, max_lane_index))
+        return LaneDataState::error;
+
+    const int ams_count = (max_lane_index + 4) / 4;
+    // printer_type stays unset: push_status already carries the OrcaSonar printer
+    // type, and overwriting it here would clear it. build_ams_payload_for_device
+    // marshals the DevFilaSystem mutation through queue_fn when set.
+    build_ams_payload_for_device(dev_id, std::nullopt, ams_count, max_lane_index, trays, queue_fn);
+    return LaneDataState::synced;
+}
+
+// Subscription scheduler for filament sync. A single detached worker drains
+// m_filament_wanted; extra requests arriving while it runs fold into its loop, so
+// a burst of topology_state doorbells costs one extra fetch that picks up the
+// trailing change. A failed fetch does not busy-retry: m_filament_failed makes
+// the next inbound LAN frame request again (an idle printer is silent, but it
+// cannot have changed lanes either), and a reconnect re-primes via the
+// ConnectStatusOk path in dispatch_local_connect().
+void OrcaPrinterAgent::request_filament_refresh(const std::string& dev_id)
+{
+    uint64_t gen;
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        if (m_current_connection != LAN || m_lan_dev_id != dev_id)
+            return;
+        gen               = m_lan_generation.load();
+        m_filament_wanted = true;
+        if (m_filament_working)
+            return; // the running worker will take the flag
+        m_filament_working = true;
+    }
+
+    m_filament_in_flight.fetch_add(1, std::memory_order_relaxed);
+    std::thread([this, dev_id, gen] {
+        struct InFlightGuard
+        {
+            std::atomic<int>& counter;
+            ~InFlightGuard() { counter.fetch_sub(1, std::memory_order_relaxed); }
+        } guard{m_filament_in_flight};
+
+        for (;;) {
+            bool needed;
+            {
+                std::lock_guard<std::mutex> lock(state_mutex);
+                needed = !m_shutting_down && m_filament_wanted && m_lan_generation.load() == gen && m_current_connection == LAN &&
+                         m_lan_dev_id == dev_id;
+                if (needed)
+                    m_filament_wanted = false;
+                else
+                    m_filament_working = false; // same critical section that saw no work: no lost wake-up
+            }
+            if (!needed)
+                return;
+            const auto state = fetch_lane_data(dev_id);
+            std::lock_guard<std::mutex> lock(state_mutex);
+            m_filament_failed = state == LaneDataState::error; // latch read by filament_doorbell_needed()
+        }
+    }).detach();
+}
+
+// A LAN frame is a refresh trigger when it carries an OrcaSonar material
+// change (a new print.topology_state.material_hash, spec REQ-STS-007 §7.7) or
+// when the last fetch errored and this frame is the retry beat. The substring
+// guard keeps the JSON parse off the steady temp-tick cadence, and hash
+// equality absorbs the tick's topology_state re-emissions.
+bool OrcaPrinterAgent::filament_doorbell_needed(const std::string& dev_id, const std::string& payload)
+{
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        if (m_current_connection != LAN || m_lan_dev_id != dev_id)
+            return false;
+        if (m_filament_failed)
+            return true;
+    }
+    // The cheap guard is the §7.7 doorbell token itself, so the steady
+    // temperature-only tick never reaches the JSON parse.
+    if (payload.find("material_hash") == std::string::npos)
+        return false;
+    auto json = nlohmann::json::parse(payload, nullptr, false);
+    if (json.is_discarded() || !json.is_object())
+        return false;
+    const auto print_it = json.find("print");
+    if (print_it == json.end() || !print_it->is_object())
+        return false;
+    const auto topo_it = print_it->find("topology_state");
+    if (topo_it == print_it->end() || !topo_it->is_object())
+        return false;
+    const auto hash_it = topo_it->find("material_hash");
+    if (hash_it == topo_it->end() || !hash_it->is_string())
+        return false;
+
+    std::lock_guard<std::mutex> lock(state_mutex);
+    if (hash_it->get<std::string>() == m_material_hash)
+        return false; // content unchanged: not a doorbell
+    m_material_hash = hash_it->get<std::string>();
+    return true;
+}
+
+// Moonraker's client bootstrap: /access/api_key hands the façade key to a
+// trusted source (the default LAN ranges include the slicer). Cache it per
+// connection generation. If the request is refused — a hardened trusted_clients
+// list, or no façade — fall back to the access code, which is what earlier
+// builds sent, so behavior degrades to the status quo rather than breaking.
+std::string OrcaPrinterAgent::lan_api_key(const std::string& origin)
+{
+    if (origin.empty())
+        return {};
+
+    std::string fallback;
+    uint64_t gen;
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        if (!m_lan_api_key.empty() && m_lan_api_key_gen == m_lan_generation.load())
+            return m_lan_api_key;
+        fallback = m_lan_password;
+        gen      = m_lan_generation.load();
+    }
+
+    std::string resolved;
+    if (std::string body; fetch_orcasonar_body(origin + "/access/api_key", body)) {
+        auto j = nlohmann::json::parse(body, nullptr, false, true);
+        if (!j.is_discarded() && j.contains("result") && j["result"].is_string())
+            resolved = j["result"].get<std::string>();
+    }
+    if (resolved.empty()) {
+        BOOST_LOG_TRIVIAL(info) << "OrcaPrinterAgent: /access/api_key unavailable; using the access code as X-Api-Key";
+        resolved = fallback;
+    }
+
+    std::lock_guard<std::mutex> lock(state_mutex);
+    if (m_lan_generation.load() == gen && !resolved.empty()) {
+        m_lan_api_key     = resolved;
+        m_lan_api_key_gen = gen;
+    }
+    return resolved;
+}
+
 bool OrcaPrinterAgent::parse_lan_endpoint(const std::string& dev_ip, std::string& host, std::string& port)
 {
     std::string s = dev_ip;
@@ -1043,6 +1342,10 @@ int OrcaPrinterAgent::connect_printer(std::string dev_id, std::string dev_ip, st
         previous_connection = m_current_connection;
         m_lan_dev_id        = dev_id;
         m_lan_url           = cfg.url;
+        m_lan_http_origin   = http_origin_from_lan_ws(cfg.url);
+        m_lan_password      = password; // access code; the façade key is bootstrapped lazily
+        m_lan_api_key.clear();
+        m_lan_api_key_gen    = gen;
         m_camera_stream_mode = CameraStreamMode::none;
         m_camera_url.clear();
         m_current_connection = LAN;
@@ -1116,6 +1419,10 @@ int OrcaPrinterAgent::disconnect_printer()
         doomed              = std::move(lan_mqtt_connection);
         prev_dev            = m_lan_dev_id;
         m_lan_dev_id.clear();
+        m_lan_http_origin.clear();
+        m_lan_api_key.clear();
+        m_filament_wanted = false; // a stale worker self-exits on the generation mismatch
+        m_filament_failed = false;
         if (m_current_connection == LAN) {
             m_current_connection = NONE;
             m_camera_stream_mode = CameraStreamMode::none;
@@ -1145,11 +1452,107 @@ int OrcaPrinterAgent::disconnect_printer()
 int OrcaPrinterAgent::send_message_to_printer(std::string dev_id, std::string json_str, int /*qos*/, int /*flag*/)
 { return route_send(/*is_lan=*/true, dev_id, json_str); }
 
+// Rewrite Bambu-convention print.ams_* payloads onto the canonical OrcaSonar
+// bodies (OPCP spec §7.8) and enforce the device's declared ams_ops. DevFilaSystem
+// is built from flat lane indices, so the Bambu encodings the shared
+// MachineObject command builders emit — ams_id/slot_id 4-tray pseudo-groups,
+// virtual tray ids 254/255 — are decoded here, at the single funnel all print
+// commands cross, and never reach the server. A command whose op token the
+// device did not declare short-circuits as *unsupported (CAP_NOT_AVAILABLE),
+// which publish_json already renders as the friendly unsupported dialog.
+std::string OrcaPrinterAgent::canonicalize_ams_payload(const std::string& dev_id, const std::string& json_str, bool* unsupported)
+{
+    if (unsupported)
+        *unsupported = false;
+    try {
+        auto envelope = nlohmann::json::parse(json_str, nullptr, false);
+        if (envelope.is_discarded() || !envelope.is_object() || !envelope.contains("print") || !envelope["print"].is_object())
+            return json_str;
+        auto& print           = envelope["print"];
+        const std::string cmd = print.value("command", std::string());
+        if (cmd.empty() || (cmd.rfind("ams_", 0) != 0 && cmd != "auto_stop_ams_dry"))
+            return json_str;
+        if (cmd == "ams_change_filament" && print.contains("selector"))
+            return json_str; // already canonical (e.g. command_ams_select_tray)
+
+        auto int_or = [&print](const char* key, int fallback) {
+            const auto it = print.find(key);
+            return (it != print.end() && it->is_number_integer()) ? it->get<int>() : fallback;
+        };
+        std::string op;
+        if (cmd == "ams_change_filament") {
+            const int target = int_or("target", -1);
+            const int slot   = int_or("slot_id", -1);
+            const int ams    = int_or("ams_id", -1);
+            print.erase("target");
+            print.erase("slot_id");
+            print.erase("tray_id");
+            print.erase("ams_id");
+            if (target == 255 && slot == 255) {
+                print["selector"] = "unload";
+                op                = "unload";
+            } else if (target == 255 || ams == 254 || ams == 255) {
+                print["selector"] = "external";
+                op                = "external";
+            } else {
+                const int lane    = target >= 0 ? target : (ams >= 0 ? ams * 4 + slot : slot);
+                print["selector"] = "lane";
+                print["lane"]     = lane;
+                op                = "change_filament";
+            }
+        } else if (cmd == "ams_filament_setting") {
+            const int ams  = int_or("ams_id", -1);
+            const int slot = int_or("slot_id", -1);
+            op             = "filament_setting";
+            if (ams >= 254) {
+                if (unsupported)
+                    *unsupported = true; // no lane for a virtual tray
+                return json_str;
+            }
+            print["lane"] = ams * 4 + slot;
+            print.erase("slot_id");
+            print.erase("tray_id");
+            print.erase("ams_id");
+        } else if (cmd == "ams_control") {
+            std::string action = print.value("action", print.value("param", std::string()));
+            op                 = action; // only "pause" is ever declared; the rest gate out
+        } else if (cmd == "ams_user_setting") {
+            op = "user_setting";
+        } else if (cmd == "ams_get_rfid") {
+            op = "get_rfid";
+            if (!print.contains("tray_id")) {
+                const int ams  = int_or("ams_id", -1);
+                const int slot = int_or("slot_id", -1);
+                if (ams >= 0 && slot >= 0) {
+                    print["tray_id"] = ams * 4 + slot; // legacy ams+slot call shape
+                    print.erase("ams_id");
+                    print.erase("slot_id");
+                }
+            }
+        } else if (cmd == "auto_stop_ams_dry") {
+            op = "stop_dry";
+        }
+        if (!op.empty() && !ams_op_supported(dev_id, op)) {
+            if (unsupported)
+                *unsupported = true;
+        }
+        return envelope.dump();
+    } catch (const std::exception&) {
+        return json_str;
+    }
+}
+
 int OrcaPrinterAgent::route_send(bool is_lan, const std::string& dev_id, const std::string& json_str)
 {
+    bool unsupported            = false;
+    const std::string canonical = canonicalize_ams_payload(dev_id, json_str, &unsupported);
+    if (unsupported) {
+        BOOST_LOG_TRIVIAL(info) << "OrcaPrinterAgent::route_send: ams op not declared by device capabilities, dev_id=" << dev_id;
+        return ORCA_NETWORK_ERR_CAP_NOT_AVAILABLE;
+    }
     std::string command = "<unparsed>";
     try {
-        const nlohmann::json envelope = nlohmann::json::parse(json_str);
+        const nlohmann::json envelope = nlohmann::json::parse(canonical);
         for (const char* namespace_name : {"pushing", "info", "print", "system", "camera", "xcam", "upgrade", "event", "files"}) {
             const auto namespace_it = envelope.find(namespace_name);
             if (namespace_it != envelope.end() && namespace_it->is_object()) {
@@ -1171,7 +1574,7 @@ int OrcaPrinterAgent::route_send(bool is_lan, const std::string& dev_id, const s
     OrcaMqttConnection* conn = get_appropriate_mqtt_connection(is_lan);
     if (!conn)
         return BAMBU_NETWORK_ERR_INVALID_HANDLE;
-    const bool queued = conn->send_request(dev_id, json_str);
+    const bool queued = conn->send_request(dev_id, canonical);
     BOOST_LOG_TRIVIAL(info) << "OrcaPrinterAgent::route_send command=" << command << " queued=" << queued << " is_lan=" << is_lan
                             << " dev_id=" << dev_id;
     return queued ? BAMBU_NETWORK_SUCCESS : BAMBU_NETWORK_ERR_CONNECTION_TO_SERVER_FAILED;
@@ -1370,7 +1773,8 @@ AgentInfo OrcaPrinterAgent::get_agent_info_static()
 // Print Job Operations - All Stubs
 // ============================================================================
 
-// Simply uploads the file to the printer via HTTP (cloud) then sends a HTTP request to start print. In the future, this might be a MQTT command to start print instead of HTTP.
+// Simply uploads the file to the printer via HTTP (cloud) then sends a HTTP request to start print. In the future, this might be a MQTT
+// command to start print instead of HTTP.
 int OrcaPrinterAgent::start_print(PrintParams params, OnUpdateStatusFn update_fn, WasCancelledFn cancel_fn, OnWaitFn wait_fn)
 {
     (void) wait_fn;
@@ -1476,8 +1880,19 @@ int OrcaPrinterAgent::start_send_gcode_to_sdcard(PrintParams params,
     std::string http_error;
     std::string response_body;
 
+    // One façade key for the whole upload exchange (directory probe + POST).
+    // If the bootstrapped key is unavailable (and there was no stored access
+    // code), fall back to the job's own password rather than sending none.
+    std::string api_key = lan_api_key(origin);
+    if (api_key.empty())
+        api_key = params.password;
+
     // check if printer has enough storage
-    Http::get(origin + "/server/files/directory?path=gcodes")
+    {
+        auto dir_req = Http::get(origin + "/server/files/directory?path=gcodes");
+        if (!api_key.empty())
+            dir_req.header("X-Api-Key", api_key);
+        dir_req
             .on_complete([&](std::string body, unsigned status) {
                 if (body.empty()) {
                     http_status = 400;
@@ -1507,6 +1922,7 @@ int OrcaPrinterAgent::start_send_gcode_to_sdcard(PrintParams params,
                 response_body = std::move(body);
             })
             .perform_sync();
+    }
 
     if (http_status >= 400) {
         BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << " failed with error code: " << http_status << ", " << http_error;
@@ -1514,8 +1930,8 @@ int OrcaPrinterAgent::start_send_gcode_to_sdcard(PrintParams params,
     }
 
     auto http = Http::post(origin + "/server/files/upload");
-    if (!params.password.empty())
+    if (!api_key.empty())
-        http.header("X-Api-Key", params.password); // trusted LAN facades may not require it; harmless when they do not
+        http.header("X-Api-Key", api_key); // bootstrapped façade key, or the access code fallback
     http.form_add("root", "gcodes")
         .form_add("print", "false")
         .form_add_file("file", source, upload_name)

src/slic3r/Utils/OrcaPrinterAgent.hpp

@@ -36,8 +36,7 @@ public:
     void set_cloud_agent(std::shared_ptr<ICloudServiceAgent> cloud) override;
     CameraStreamMode get_camera_stream_mode() const override;
     std::string get_camera_url() const override;
-    std::unique_ptr<ICameraSignalingChannel>
+    std::unique_ptr<ICameraSignalingChannel> create_camera_signaling_channel(const std::string& dev_id) override;
-    create_camera_signaling_channel(const std::string& dev_id) override;
 
     // Communication
     int send_message(std::string dev_id, std::string json_str, int qos, int flag) override;
@@ -100,6 +99,14 @@ public:
                              int sequence_id,
                              bool lan_mode) override;
 
+    // Filament sync (subscription): `subscription` when the selected printer
+    // reports a material system (get_capabilities protocol.features.fms),
+    // `none` otherwise. The mode is transport-agnostic; the lane_data fetch and
+    // topology_state doorbell that keep DevFilaSystem fresh are LAN-only, and
+    // cloud printers get their AMS view from the mirrored push_status.
+    FilamentSyncMode get_filament_sync_mode() const override;
+    bool fetch_filament_info(std::string dev_id, FilamentSyncMode sync_mode = FilamentSyncMode::pull) override;
+
     // Test-only: drive emit_connect_sequence directly (no socket).
     void run_connect_sequence_for_test(const std::string& dev_id)
     {
@@ -111,7 +118,22 @@ public:
     // Test-only: the same for the (independent) cloud selection epoch.
     void bump_cloud_generation_for_test() { ++m_cloud_generation; }
 
-    FilamentSyncMode get_filament_sync_mode() const override { return FilamentSyncMode::subscription; }
+    // Test-only: observe the subscription doorbell policy without spawning the refresh worker.
+    bool filament_doorbell_needed_for_test(const std::string& dev_id, const std::string& payload)
+    {
+        return filament_doorbell_needed(dev_id, payload);
+    }
+    // Test-only: arm the fetch-failure latch (retry-on-next-LAN-frame rule).
+    void set_filament_failed_for_test(bool v)
+    {
+        std::lock_guard<std::mutex> lock(state_mutex);
+        m_filament_failed = v;
+    }
+    // Test-only: Bambu ams_* wire JSON -> canonical OrcaSonar bodies (§7.8).
+    // Returns the (possibly rewritten) payload; *unsupported is set when the
+    // device's declared ams_ops exclude the operation (CAP_NOT_AVAILABLE in
+    // the live route_send path).
+    static std::string canonicalize_ams_payload(const std::string& dev_id, const std::string& json_str, bool* unsupported);
 
 protected:
     // Forward one inbound printer message to on_message_fn or on_local_message_fn (marshalled onto the UI
@@ -193,9 +215,44 @@ private:
 
     std::string m_lan_dev_id;                                       // guarded by state_mutex
     std::string m_lan_url;                                          // guarded by state_mutex — the Config.url of the live LAN session
+    std::string m_lan_http_origin;                                  // guarded by state_mutex — http(s) origin of the LAN façade
+    std::string m_lan_password;                                     // guarded by state_mutex — MQTT access code; X-Api-Key fallback
+    std::string m_lan_api_key;                                      // guarded by state_mutex — cached Moonraker-façade key, "" = unresolved
+    uint64_t m_lan_api_key_gen = 0;                                 // m_lan_generation the cached key belongs to
     CameraStreamMode m_camera_stream_mode = CameraStreamMode::none; // guarded by state_mutex
     std::string m_camera_url;                                       // guarded by state_mutex
 
+    // The Moonraker-façade X-Api-Key, bootstrapped from /access/api_key (trusted
+    // clients only) and cached per connection generation; falls back to the
+    // access code when the endpoint is unavailable (untrusted/hardened config).
+    std::string lan_api_key(const std::string& origin);
+
+    // Subscription-mode filament sync. One detached worker per burst drains
+    // m_filament_wanted by re-reading lane_data; doorbell frames (a pushed
+    // print.topology_state change) and the failure latch are the only triggers —
+    // no timer: an idle OrcaSonar emits no frames, and cannot change lanes either.
+    void request_filament_refresh(const std::string& dev_id);
+        // OPCP §7.7: the doorbell is a CHANGE in print.topology_state.material_hash
+    // (lane content only — tool temperature churn inside topology_state must not
+    // re-fetch); consuming a new value updates m_material_hash.
+    bool filament_doorbell_needed(const std::string& dev_id, const std::string& payload);
+
+    // Tri-state lane_data fetch outcome (REQ-STS-007 §7.7 read semantics):
+    //  synced  — 200 with lane entries, payload built;
+    //  none    — 200 with an empty value: authoritative "no lanes", AMS view cleared;
+    //  unknown — 404: topology not bootstrapped yet or material_units unknown;
+    //            never latched, the next doorbell or reconnect retries;
+    //  error   — transport/5xx: latched, retried on the next inbound frame.
+    enum class LaneDataState { synced, none, unknown, error };
+    LaneDataState fetch_lane_data(const std::string& dev_id);
+
+    bool m_filament_wanted  = false; // guarded by state_mutex; a fetch is pending
+    bool m_filament_working = false; // guarded by state_mutex; a worker owns the queue
+    bool m_filament_failed  = false; // guarded by state_mutex; retry-on-next-LAN-frame rule
+    bool m_shutting_down    = false; // guarded by state_mutex; workers stop taking fetches
+    std::string m_material_hash;     // guarded by state_mutex; last doorbell value seen
+    std::atomic<int> m_filament_in_flight{0}; // detached workers; drained by the destructor
+
     OrcaCloudServiceAgent* get_orca_cloud_agent();
 
     OrcaMqttConnection* get_appropriate_mqtt_connection(bool is_lan = true);

src/slic3r/Utils/SnapmakerPrinterAgent.cpp

@@ -239,25 +239,6 @@ bool SnapmakerPrinterAgent::fetch_filament_info(std::string dev_id, FilamentSync
                 tray.tray_type  = combine_filament_type(safe_at(filament_type, i, empty_str), safe_at(filament_sub_type, i, empty_str));
                 tray.tray_color = safe_at(filament_color, i, default_color);
 
-                auto* bundle = GUI::wxGetApp().preset_bundle;
-                // Try to find a matching preset for this filament based on vendor, type and color.
-                // If not found, default to traditional search by type only or generic type mapping.
-                if (bundle) {
-                    std::string vendor      = safe_at(filament_vendor, i, empty_str);
-                    std::string filament_id = find_closest_color_preset_by_vendor_and_type(bundle->filaments, vendor, tray.tray_type,
-                                                                                           tray.tray_color);
-
-                    if (!filament_id.empty()) {
-                        tray.tray_info_idx = filament_id;
-                        BOOST_LOG_TRIVIAL(warning)
-                            << "Filament sync: Found manufacturer-specific profile for slot " << i << ": " << filament_id;
-                    } else {
-                        tray.tray_info_idx = bundle->filaments.filament_id_by_type(tray.tray_type);
-                    }
-                } else {
-                    tray.tray_info_idx = map_filament_type_to_generic_id(tray.tray_type);
-                }
-
                 // Extract NFC temperature data if available
                 if (nfc_info.is_array() && i < static_cast<int>(nfc_info.size()) && nfc_info[i].is_object()) {
                     auto& nfc_slot     = nfc_info[i];
@@ -272,12 +253,46 @@ bool SnapmakerPrinterAgent::fetch_filament_info(std::string dev_id, FilamentSync
             trays.emplace_back(std::move(tray));
         }
 
-        build_ams_payload(1, slot_count - 1, trays);
+        // Preset matching (vendor + closest color) reads GUI preset state, so it
+        // runs on the main thread via this resolver, not on the fetch worker.
+        std::vector<std::string> vendors;
+        vendors.reserve(slot_count);
+        for (int i = 0; i < slot_count; ++i)
+            vendors.push_back(safe_at(filament_vendor, i, empty_str));
+
+        build_ams_payload(1, slot_count - 1, trays,
+            [vendors](std::vector<AmsTrayData>& resolved) { resolve_snapmaker_tray_info(resolved, vendors); });
     }).detach();
 
     return true;
 }
 
+void SnapmakerPrinterAgent::resolve_snapmaker_tray_info(std::vector<AmsTrayData>& trays,
+                                                        const std::vector<std::string>& vendors)
+{
+    auto* bundle = GUI::wxGetApp().preset_bundle;
+    for (auto& tray : trays) {
+        if (!tray.has_filament)
+            continue;
+        const std::string vendor = (tray.slot_index >= 0 && tray.slot_index < static_cast<int>(vendors.size()))
+                                       ? vendors[tray.slot_index]
+                                       : std::string();
+        if (bundle) {
+            // Try a matching preset by vendor, type and color; fall back to
+            // type only, then to the generic family map.
+            std::string filament_id = find_closest_color_preset_by_vendor_and_type(bundle->filaments, vendor, tray.tray_type, tray.tray_color);
+            if (!filament_id.empty()) {
+                tray.tray_info_idx = filament_id;
+                BOOST_LOG_TRIVIAL(warning) << "Filament sync: Found manufacturer-specific profile for slot " << tray.slot_index << ": " << filament_id;
+            } else {
+                tray.tray_info_idx = bundle->filaments.filament_id_by_type(tray.tray_type);
+            }
+        } else {
+            tray.tray_info_idx = map_filament_type_to_generic_id(tray.tray_type);
+        }
+    }
+}
+
 FilamentSyncMode SnapmakerPrinterAgent::get_filament_sync_mode() const
 {
     if (GUI::wxGetApp().app_config->get_bool("use_printer_agents"))

src/slic3r/Utils/SnapmakerPrinterAgent.hpp

@@ -6,6 +6,7 @@
 #include <atomic>
 #include <cstdint>
 #include <string>
+#include <vector>
 
 namespace Slic3r {
 
@@ -28,6 +29,12 @@ private:
     // Combine filament_type + filament_sub_type into a unified type string
     static std::string combine_filament_type(const std::string& type, const std::string& sub_type);
 
+    // Resolve tray_info_idx for the collected trays. Reads the GUI preset
+    // bundle, so it is invoked on the main thread from within the shared
+    // build_ams_payload_for_device() (never on the fetch worker).
+    static void resolve_snapmaker_tray_info(std::vector<AmsTrayData>& trays,
+                                            const std::vector<std::string>& vendors);
+
     void start_camera_monitor();
     void on_status_loop_tick(const std::string& dev_id) override;
 

tests/slic3rutils/test_orca_printer_agent.cpp

@@ -1,4 +1,6 @@
 #include <catch2/catch_test_macros.hpp>
+#include <nlohmann/json.hpp>
+#include <slic3r/Utils/AmsPayload.hpp>
 #include <slic3r/Utils/OrcaCloudServiceAgent.hpp>
 #include <slic3r/Utils/OrcaPrinterAgent.hpp>
 
@@ -46,7 +48,7 @@ TEST_CASE("OrcaPrinterAgent stamps the get_capabilities nozzle diameter onto pus
     // is cached for the device.
     agent.deliver_to_sink(
         "dev-1",
-        R"({"info":{"command":"get_capabilities","capabilities":{"topology":{"tools":[{"id":"T0","nozzle":{"diameter_mm":0.4}}]}}}})",
+        R"({"info":{"command":"get_capabilities","capabilities":{"topology":{"tools":[{"id":"T0","nozzle":{"diameter_mm":0.4}}]},"protocol":{"ams_ops":["change_filament"]}}}})",
         /*local=*/false);
     CHECK(last_payload.find("\"command\":\"get_capabilities\"") != std::string::npos);
     CHECK(last_payload.find("\"print\"") == std::string::npos);
@@ -65,6 +67,14 @@ TEST_CASE("OrcaPrinterAgent stamps the get_capabilities nozzle diameter onto pus
     agent.deliver_to_sink("dev-1", R"({"print":{"command":"push_status","nozzle_diameter":0.6}})", /*local=*/false);
     CHECK(last_payload.find("\"nozzle_diameter\":0.6") != std::string::npos);
     CHECK(last_payload.find("N/A") == std::string::npos);
+
+    // The reply's declared ams_ops register on the device (OPCP §7.8): the one
+    // declared op passes the client gate, an undeclared one is rejected.
+    bool unsupported = false;
+    OrcaPrinterAgent::canonicalize_ams_payload("dev-1", R"({"print":{"command":"ams_change_filament","target":1}})", &unsupported);
+    CHECK_FALSE(unsupported);
+    OrcaPrinterAgent::canonicalize_ams_payload("dev-1", R"({"print":{"command":"ams_control","param":"pause"}})", &unsupported);
+    CHECK(unsupported);
 }
 
 TEST_CASE("OrcaPrinterAgent::parse_lan_endpoint", "[OrcaPrinterAgent]") {
@@ -92,6 +102,89 @@ TEST_CASE("connect_printer wires up a LAN Config", "[OrcaPrinterAgent][.integrat
     agent.disconnect_printer();
 }
 
+// why hidden: connect_printer starts a detached connect worker, like the LAN
+// test above. The sync mode follows the printer's own AMS capability, not the
+// transport: a connected printer stays `none` until its get_capabilities reply
+// declares a material system. The registry is process-wide, so this test uses
+// ids no other test feeds capabilities for.
+TEST_CASE("filament sync follows the printer's AMS capability", "[OrcaPrinterAgent][.integration]") {
+    Probe agent("/tmp");
+    CHECK(agent.get_filament_sync_mode() == Slic3r::FilamentSyncMode::none);
+
+    REQUIRE(agent.connect_printer("dev-ams-1", "10.255.255.1", "orcasonar", "code", false) == BAMBU_NETWORK_SUCCESS);
+    // Connected, but no capability reply yet: still none.
+    CHECK(agent.get_filament_sync_mode() == Slic3r::FilamentSyncMode::none);
+
+    // features.fms=true is the authoritative material-system flag.
+    agent.deliver_to_sink("dev-ams-1",
+        R"({"info":{"command":"get_capabilities","capabilities":{"protocol":{"features":{"fms":true},"ams_ops":["change_filament"]}}}})",
+        /*local=*/true);
+    CHECK(agent.get_filament_sync_mode() == Slic3r::FilamentSyncMode::subscription);
+
+    // An explicit false clears it again.
+    agent.deliver_to_sink("dev-ams-1",
+        R"({"info":{"command":"get_capabilities","capabilities":{"protocol":{"features":{"fms":false}}}}})",
+        /*local=*/true);
+    CHECK(agent.get_filament_sync_mode() == Slic3r::FilamentSyncMode::none);
+
+    // Older payloads without features.fms fall back to a non-empty ams_ops.
+    agent.deliver_to_sink("dev-ams-1",
+        R"({"info":{"command":"get_capabilities","capabilities":{"protocol":{"ams_ops":["change_filament"]}}}})",
+        /*local=*/true);
+    CHECK(agent.get_filament_sync_mode() == Slic3r::FilamentSyncMode::subscription);
+
+    // The pull contract (Sidebar's blocking path) is gone: a pull-mode fetch is
+    // refused by the mode guard, and a subscription fetch for a device that is
+    // not the active printer is refused before any HTTP.
+    CHECK_FALSE(agent.fetch_filament_info("dev-ams-1", Slic3r::FilamentSyncMode::pull));
+    CHECK_FALSE(agent.fetch_filament_info("dev-ams-2", Slic3r::FilamentSyncMode::subscription));
+
+    agent.disconnect_printer();
+    CHECK(agent.get_filament_sync_mode() == Slic3r::FilamentSyncMode::none);
+}
+
+// The subscription refresh is self-triggered: a pushed frame whose print block
+// carries a CHANGED topology_state.material_hash (spec REQ-STS-007 §7.7) is
+// the doorbell; repeat hashes, temperature-only frames and hash-less blocks
+// are not (no per-frame polling regression).
+TEST_CASE("a material_hash change is the filament-sync doorbell", "[OrcaPrinterAgent][.integration]") {
+    Probe agent("/tmp");
+    REQUIRE(agent.connect_printer("dev-1", "10.255.255.1", "orcasonar", "code", false) == BAMBU_NETWORK_SUCCESS);
+
+    const std::string frame_a = R"({"print":{"command":"push_status","topology_state":{"material_hash":"sha256:aaaaaaaaaaaaaaaa","units":[]}}})";
+    CHECK(agent.filament_doorbell_needed_for_test("dev-1", frame_a));
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-1", frame_a));
+    CHECK(agent.filament_doorbell_needed_for_test("dev-1",
+        R"({"print":{"command":"push_status","topology_state":{"material_hash":"sha256:bbbbbbbbbbbbbbbb","units":[]}}})"));
+    // Topology block without the doorbell token (older/foreign payload): stays quiet.
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-1",
+        R"({"print":{"command":"push_status","topology_state":{"units":[]}}})"));
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-1", R"({"print":{"command":"push_status","mc_percent":10}})"));
+    // Not the active LAN device: never a doorbell.
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-2", frame_a));
+
+    agent.disconnect_printer();
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-1", frame_a));
+}
+
+// After a failed lane_data fetch there is no retry timer: any next LAN frame
+// re-arms the refresh, because a changing printer keeps pushing.
+TEST_CASE("a failed filament fetch retries on the next LAN frame", "[OrcaPrinterAgent][.integration]") {
+    Probe agent("/tmp");
+    REQUIRE(agent.connect_printer("dev-1", "10.255.255.1", "orcasonar", "code", false) == BAMBU_NETWORK_SUCCESS);
+
+    const std::string telemetry = R"({"print":{"command":"push_status","mc_percent":10}})";
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-1", telemetry));
+    agent.set_filament_failed_for_test(true);
+    CHECK(agent.filament_doorbell_needed_for_test("dev-1", telemetry));
+
+    agent.disconnect_printer();
+    // disconnect clears the latch; the next connect eager-fetches instead.
+    REQUIRE(agent.connect_printer("dev-1", "10.255.255.1", "orcasonar", "code", false) == BAMBU_NETWORK_SUCCESS);
+    CHECK_FALSE(agent.filament_doorbell_needed_for_test("dev-1", telemetry));
+    agent.disconnect_printer();
+}
+
 TEST_CASE("post-connect sequence is subscribe then 4 requests in order", "[OrcaPrinterAgent]") {
     struct SeqProbe : OrcaPrinterAgent {
         using OrcaPrinterAgent::OrcaPrinterAgent;
@@ -202,3 +295,65 @@ TEST_CASE("destroying an agent mid-connect does not hang or crash", "[OrcaPrinte
     }
     SUCCEED();
 }
+
+// OPCP spec §7.8: Bambu wire conventions must be decoded at the agent funnel,
+// never smuggled through as numeric lanes (an external-spool select once read
+// as slot_id=0 and physically loaded gate 0).
+TEST_CASE("OrcaPrinterAgent rewrites Bambu ams_* payloads onto the canonical OrcaSonar bodies", "[OrcaPrinterAgent]") {
+    auto canon = [](const std::string& dev, const std::string& in, bool* unsupported = nullptr) {
+        bool local = false;
+        return OrcaPrinterAgent::canonicalize_ams_payload(dev, in, unsupported ? unsupported : &local);
+    };
+
+    auto out = nlohmann::json::parse(canon("dev-c1",
+        R"({"print":{"command":"ams_change_filament","sequence_id":"1","target":5,"slot_id":1,"ams_id":1,"curr_temp":210,"tar_temp":220}})"));
+    CHECK(out["print"]["selector"] == "lane");
+    CHECK(out["print"]["lane"] == 5);
+    CHECK(!out["print"].contains("target"));
+    CHECK(!out["print"].contains("slot_id"));
+    CHECK(!out["print"].contains("ams_id"));
+    CHECK(out["print"]["tar_temp"] == 220);
+
+    // External-spool selection ("254" arrives hacked to 255 with slot_id=0):
+    // must become the selector op, never a lane.
+    out = nlohmann::json::parse(canon("dev-c1", R"({"print":{"command":"ams_change_filament","ams_id":255,"target":255,"slot_id":0}})"));
+    CHECK(out["print"]["selector"] == "external");
+    CHECK(!out["print"].contains("lane"));
+
+    out = nlohmann::json::parse(canon("dev-c1", R"({"print":{"command":"ams_change_filament","ams_id":0,"target":255,"slot_id":255}})"));
+    CHECK(out["print"]["selector"] == "unload");
+
+    out = nlohmann::json::parse(canon("dev-c1", R"({"print":{"command":"ams_change_filament","ams_id":1,"slot_id":2}})"));
+    CHECK(out["print"]["lane"] == 6);
+
+    out = nlohmann::json::parse(canon("dev-c1", R"({"print":{"command":"ams_filament_setting","ams_id":1,"slot_id":2,"tray_id":2,"tray_type":"PLA"}})"));
+    CHECK(out["print"]["lane"] == 6);
+    CHECK(out["print"]["tray_type"] == "PLA");
+
+    // Legacy RFID call shape (ams_id+slot_id, no tray_id) flattens to tray_id.
+    out = nlohmann::json::parse(canon("dev-c1", R"({"print":{"command":"ams_get_rfid","ams_id":1,"slot_id":2}})"));
+    CHECK(out["print"]["tray_id"] == 6);
+    CHECK(!out["print"].contains("ams_id"));
+
+    const std::string canonical = R"({"print":{"command":"ams_change_filament","selector":"lane","lane":3}})";
+    CHECK(canon("dev-c1", canonical) == canonical);
+    CHECK(canon("dev-c1", R"({"print":{"command":"pause"}})") == R"({"print":{"command":"pause"}})");
+    CHECK(canon("dev-c1", "not json at all") == "not json at all");
+
+    // Declared ams_ops gate at the client: only change_filament is supported.
+    Slic3r::register_ams_ops("dev-c2", {"change_filament"});
+    bool unsupported = false;
+    canon("dev-c2", R"({"print":{"command":"ams_change_filament","target":255,"slot_id":255}})", &unsupported);
+    CHECK(unsupported);
+    unsupported = false;
+    canon("dev-c2", R"({"print":{"command":"ams_control","param":"pause"}})", &unsupported);
+    CHECK(unsupported);
+    unsupported = false;
+    canon("dev-c2", R"({"print":{"command":"ams_change_filament","target":1}})", &unsupported);
+    CHECK(!unsupported);
+
+    // A device with no capabilities record is never gated (server backstops).
+    unsupported = false;
+    canon("dev-c3", R"({"print":{"command":"ams_user_setting","ams_id":0}})", &unsupported);
+    CHECK(!unsupported);
+}

tests/slic3rutils/test_printer_agent.cpp

@@ -68,6 +68,136 @@ TEST_CASE("Moonraker parses nozzle diameter from raw config and tolerates missin
     CHECK(MoonrakerParserProbe::parse_nozzle_diameter(missing_response) == 0.0f);
 }
 
+// why: the lane_data projection is shared by Moonraker and OrcaSonar; the
+// parser is pure so it can be checked without a live printer or a GUI.
+TEST_CASE("unit: lane_data projection maps lanes into AMS trays", "[unit][moonraker]")
+{
+    const auto body = nlohmann::json::parse(R"({
+        "result": {
+            "namespace": "lane_data",
+            "value": {
+                "lane0": {"lane": "0", "material": "PLA", "color": "FF0000FF"},
+                "lane1": {"lane": "1"},
+                "lane2": {"lane": "not-a-number"},
+                "lane3": {"lane": "3", "material": "PETG", "color": "#00FF00", "nozzle_temp": 240}
+            }
+        }
+    })");
+
+    std::vector<AmsTrayData> trays;
+    int max_lane_index = -1;
+    REQUIRE(parse_moonraker_lane_data(body, trays, max_lane_index));
+    REQUIRE(trays.size() == 3);
+    CHECK(trays[0].slot_index == 0);
+    CHECK(trays[0].has_filament);
+    CHECK(trays[0].tray_type == "PLA");
+    CHECK(trays[0].tray_color == "FF0000FF");
+    CHECK(trays[1].slot_index == 1);
+    CHECK_FALSE(trays[1].has_filament);
+    CHECK(trays[1].tray_type.empty());
+    CHECK(trays[2].slot_index == 3);
+    CHECK(trays[2].nozzle_temp == 240);
+    CHECK(max_lane_index == 3);
+}
+
+TEST_CASE("unit: lane_data projection rejects malformed and empty responses", "[unit][moonraker]")
+{
+    std::vector<AmsTrayData> trays;
+    int max_lane_index = -1;
+    CHECK_FALSE(parse_moonraker_lane_data(nlohmann::json::object(), trays, max_lane_index));
+    CHECK_FALSE(parse_moonraker_lane_data(nlohmann::json::parse(R"({"result":{"value":{}}})"), trays, max_lane_index));
+    CHECK_FALSE(parse_moonraker_lane_data(
+        nlohmann::json::parse(R"({"result":{"value":{"lane0":{"lane":"x"},"lane1":42}}})"), trays, max_lane_index));
+}
+
+// why: OrcaSonar projects sensed presence separately from declared material, so a
+// loaded lane with no type must not collapse to "empty".
+TEST_CASE("unit: lane_data presence is independent of declared material", "[unit][moonraker]")
+{
+    const auto body = nlohmann::json::parse(R"({
+        "result": {"value": {
+            "lane0": {"lane": "0", "has_filament": true},
+            "lane1": {"lane": "1", "has_filament": false, "material": "PLA"},
+            "lane2": {"lane": "2", "loaded": true},
+            "lane3": {"lane": "3", "material": "ASA"}
+        }}
+    })");
+
+    std::vector<AmsTrayData> trays;
+    int max_lane_index = -1;
+    REQUIRE(parse_moonraker_lane_data(body, trays, max_lane_index));
+    REQUIRE(trays.size() == 4);
+
+    CHECK(trays[0].has_filament);
+    CHECK(trays[0].tray_type.empty());
+
+    CHECK_FALSE(trays[1].has_filament);
+    CHECK(trays[1].tray_type == "PLA");
+
+    CHECK(trays[2].has_filament);
+
+    CHECK(trays[3].has_filament);
+    CHECK(trays[3].tray_type == "ASA");
+}
+
+// why: the exist bits and per-slot placeholder flag drive the sidebar's occupied
+// vs empty rendering; the builder is pure so this needs no GUI.
+TEST_CASE("unit: AMS payload sets exist bits and omits placeholder for loaded lanes", "[unit][moonraker]")
+{
+    std::vector<AmsTrayData> trays = {
+        {0, true, "PLA", "FF0000FF", "", 0, 0},
+        {2, true, "", "", "", 0, 0},   // loaded but undeclared
+        {5, true, "PETG", "00FF00", "", 0, 0},
+    };
+    const auto ams = build_bbl_ams_json(trays, 2, 5);
+
+    // Units 0 and 1 exist; slots 0, 2 and 5 hold filament (0b100101).
+    CHECK(ams["ams_exist_bits"].get<std::string>() == "3");
+    CHECK(ams["tray_exist_bits"].get<std::string>() == "25");
+
+    const auto& u0 = ams["ams"][0]["tray"];
+    CHECK_FALSE(u0[0].contains("tray_slot_placeholder"));
+    CHECK(u0[1].contains("tray_slot_placeholder"));
+    CHECK_FALSE(u0[2].contains("tray_slot_placeholder"));
+    CHECK(u0[2]["tray_type"].get<std::string>() == "");
+    CHECK(u0[2]["tray_color"].get<std::string>() == "00000000");
+
+    const auto& u1 = ams["ams"][1]["tray"];
+    CHECK(u1[0].contains("tray_slot_placeholder"));           // slot 4 absent
+    CHECK_FALSE(u1[1].contains("tray_slot_placeholder"));     // slot 5 present
+    CHECK(u1[1]["tray_color"].get<std::string>() == "00FF00FF"); // 6-hex padded
+}
+
+// why: the exist-bits fields are 64-bit; multi-box rigs past lane 31 would be
+// corrupted by a 32-bit unsigned long shift on MSVC. Guards the 64-bit path.
+TEST_CASE("unit: AMS payload sets exist bits beyond 31 lanes", "[unit][moonraker]")
+{
+    std::vector<AmsTrayData> trays = {
+        {33, true, "PLA", "FF0000FF", "", 0, 0},
+    };
+    const auto ams = build_bbl_ams_json(trays, 9, 33);
+
+    CHECK(ams["ams_exist_bits"].get<std::string>() == "1FF");        // units 0..8
+    CHECK(ams["tray_exist_bits"].get<std::string>() == "200000000"); // 1 << 33
+
+    const auto& u8 = ams["ams"][8]["tray"];
+    CHECK_FALSE(u8[1].contains("tray_slot_placeholder")); // slot 33 present
+}
+
+// why: the sync mode keys off the printer's declared material system; a device
+// with no capability record must never read as AMS-capable.
+TEST_CASE("unit: AMS capability registry reports only declared material systems", "[unit][moonraker]")
+{
+    CHECK_FALSE(has_ams_capability("cap-none"));
+    register_ams_capability("cap-true", true);
+    CHECK(has_ams_capability("cap-true"));
+    register_ams_capability("cap-false", false);
+    CHECK_FALSE(has_ams_capability("cap-false"));
+    // Later replies overwrite: a removed material system must clear the flag.
+    register_ams_capability("cap-true", false);
+    CHECK_FALSE(has_ams_capability("cap-true"));
+}
+
 // why: these builders preserve the Bambu firmware dialect byte-for-byte, including its trailing space.
 TEST_CASE("unit: BBL AMS gcode builders preserve command bytes", "[unit][bbl]")
 {