Keep the Process and Printer of an inherits_group of the Wrong Length

A project whose inherits_group did not have one entry per filament plus the process and printer entries was loaded as if it had none. The CLI then looked for system presets under the names of the user presets, found none and refused to slice a project that slices on main. The group is now read as before: the process first, the printer last and the filaments in between, up to the filament count. A filament without an entry counts as a system preset. A group with fewer than two entries is still ignored. The warning stays.
Move the Assemble List Parser into libslic3r
2026-09-29 11:51:24 +00:00 · 2026-09-29 13:33:34 +08:00 · 2026-09-29 02:51:05 +08:00 · 2026-09-28 05:58:48 +08:00
9 changed files with 772 additions and 223 deletions
@@ -642,162 +642,6 @@ static void load_default_gcodes_to_config(DynamicPrintConfig& config, Preset::Ty
    }
 }

-static int load_assemble_plate_list(std::string config_file, std::vector<assemble_plate_info_t> &assemble_plate_info_list)
-{
-    int ret = 0;
-    boost::filesystem::path directory_path(config_file);
-
-    BOOST_LOG_TRIVIAL(info) << boost::format("%1% enter, file %2%")%__FUNCTION__ % config_file;
-    if (!fs::exists(directory_path)) {
-        BOOST_LOG_TRIVIAL(error) << boost::format("directory %1% not exist.")%config_file;
-        return CLI_FILE_NOTFOUND;
-    }
-
-    try {
-        json root_json;
-        boost::nowide::ifstream ifs(config_file);
-        ifs >> root_json;
-        ifs.close();
-
-        int plate_count = root_json[JSON_ASSEMPLE_PLATES].size();
-        if ((plate_count <= 0) || (plate_count > MAX_PLATE_COUNT)) {
-            BOOST_LOG_TRIVIAL(error) << __FUNCTION__<< boost::format(": invalid plate count %1%")%plate_count;
-            return CLI_CONFIG_FILE_ERROR;
-        }
-        assemble_plate_info_list.resize(plate_count);
-
-        for (int plate_index = 0; plate_index < plate_count; plate_index++)
-        {
-            assemble_plate_info_t &assemble_plate = assemble_plate_info_list[plate_index];
-            const json& plate_json = root_json[JSON_ASSEMPLE_PLATES][plate_index];
-            assemble_plate.plate_name = plate_json[JSON_ASSEMPLE_PLATE_NAME];
-            assemble_plate.need_arrange = plate_json[JSON_ASSEMPLE_PLATE_NEED_ARRANGE];
-
-            if (plate_json.contains(JSON_ASSEMPLE_PLATE_PARAMS)) {
-                assemble_plate.plate_params = plate_json[JSON_ASSEMPLE_PLATE_PARAMS].get<std::map<std::string, std::string>>();
-                BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, has %2% plate params") % (plate_index + 1)  % assemble_plate.plate_params.size();
-            }
-
-            int object_count = plate_json[JSON_ASSEMPLE_OBJECTS].size();
-            if (object_count <= 0) {
-                BOOST_LOG_TRIVIAL(error) << __FUNCTION__<< boost::format(": invalid object count %1% in plate %2%")%object_count %(plate_index+1);
-                return CLI_CONFIG_FILE_ERROR;
-            }
-
-            assemble_plate.assemble_obj_list.resize(object_count);
-            for (int object_index = 0; object_index < object_count; object_index++)
-            {
-                assemble_object_info_t& assemble_object = assemble_plate.assemble_obj_list[object_index];
-                const json& object_json = plate_json[JSON_ASSEMPLE_OBJECTS][object_index];
-
-                assemble_object.path = object_json[JSON_ASSEMPLE_OBJECT_PATH];
-                assemble_object.count = object_json[JSON_ASSEMPLE_OBJECT_COUNT];
-
-                if (assemble_object.count <= 0) {
-                    BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": invalid object clone count %1% in plate %2% Object %3%") % assemble_object.count % (plate_index + 1) % assemble_object.path;
-                    return CLI_CONFIG_FILE_ERROR;
-                }
-
-                assemble_object.filaments = object_json.at(JSON_ASSEMPLE_OBJECT_FILAMENTS).get<std::vector<int>>();
-                if ((assemble_object.filaments.size() > 0) && (assemble_object.filaments.size() != assemble_object.count) && (assemble_object.filaments.size() != 1))
-                {
-                    BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s filaments count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.filaments.size() % assemble_object.count;
-                    return CLI_CONFIG_FILE_ERROR;
-                }
-
-                if (object_json.contains(JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX)) {
-                    assemble_object.assemble_index = object_json[JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX].get<std::vector<int>>();
-                    if ((assemble_object.assemble_index.size() > 0) && (assemble_object.assemble_index.size() != assemble_object.count) && (assemble_object.assemble_index.size() != 1))
-                    {
-                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s assemble_index count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.assemble_index.size() % assemble_object.count;
-                        return CLI_CONFIG_FILE_ERROR;
-                    }
-                }
-
-                if (object_json.contains(JSON_ASSEMPLE_OBJECT_POS_X)) {
-                    assemble_object.pos_x = object_json[JSON_ASSEMPLE_OBJECT_POS_X].get<std::vector<float>>();
-                    if ((assemble_object.pos_x.size() > 0) && (assemble_object.pos_x.size() != assemble_object.count) && (assemble_object.pos_x.size() != 1))
-                    {
-                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s pos_x count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.pos_x.size() % assemble_object.count;
-                        return CLI_CONFIG_FILE_ERROR;
-                    }
-                }
-                if (object_json.contains(JSON_ASSEMPLE_OBJECT_POS_Y)) {
-                    assemble_object.pos_y = object_json[JSON_ASSEMPLE_OBJECT_POS_Y].get<std::vector<float>>();
-                    if ((assemble_object.pos_y.size() > 0) && (assemble_object.pos_y.size() != assemble_object.count) && (assemble_object.pos_y.size() != 1))
-                    {
-                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s pos_y count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.pos_y.size() % assemble_object.count;
-                        return CLI_CONFIG_FILE_ERROR;
-                    }
-                }
-                if (object_json.contains(JSON_ASSEMPLE_OBJECT_POS_Z)) {
-                    assemble_object.pos_z = object_json[JSON_ASSEMPLE_OBJECT_POS_Z].get<std::vector<float>>();
-                    if ((assemble_object.pos_z.size() > 0) && (assemble_object.pos_z.size() != assemble_object.count) && (assemble_object.pos_z.size() != 1))
-                    {
-                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s pos_z count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.pos_z.size() % assemble_object.count;
-                        return CLI_CONFIG_FILE_ERROR;
-                    }
-                }
-                if (object_json.contains(JSON_ASSEMPLE_OBJECT_PRINT_PARAMS)) {
-                    assemble_object.print_params = object_json[JSON_ASSEMPLE_OBJECT_PRINT_PARAMS].get<std::map<std::string, std::string>>();
-                    BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, object %2% has %3% print params") % (plate_index + 1) %assemble_object.path % assemble_object.print_params.size();
-                }
-                if (object_json.contains(JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES)) {
-                    json height_range_json = object_json[JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES];
-                    int range_count = height_range_json.size();
-
-                    BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, object %2% has %3% height ranges") % (plate_index + 1) %assemble_object.path % range_count;
-
-                    assemble_object.height_ranges.resize(range_count);
-                    for (int range_index = 0; range_index < range_count; range_index++)
-                    {
-                        height_range_info_t& height_range = assemble_object.height_ranges[range_index];
-                        height_range.min_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MIN_Z];
-                        height_range.max_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MAX_Z];
-                        height_range.range_params = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_RANGE_PARAMS].get<std::map<std::string, std::string>>();
-                    }
-                }
-            }
-            if (plate_json.contains(JSON_ASSEMPLE_ASSEMBLE_PARAMS)) {
-                json assemble_params_json = plate_json[JSON_ASSEMPLE_ASSEMBLE_PARAMS];
-                int assemble_count = assemble_params_json.size();
-                for (int i = 0; i < assemble_count; i++)
-                {
-                    assembled_param_info_t assembled_param;
-                    int assemble_index = assemble_params_json[i][JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX];
-                    if (assemble_params_json[i].contains(JSON_ASSEMPLE_OBJECT_PRINT_PARAMS)) {
-                        assembled_param.print_params = assemble_params_json[i][JSON_ASSEMPLE_OBJECT_PRINT_PARAMS].get<std::map<std::string, std::string>>();
-                        BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, assemble object %2% has %3% print params") % (plate_index + 1) %i % assembled_param.print_params.size();
-                    }
-                    if (assemble_params_json[i].contains(JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES)) {
-                        json height_range_json = assemble_params_json[i][JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES];
-                        int range_count = height_range_json.size();
-
-                        BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, assemble object %2% has %3% height ranges") % (plate_index + 1) %i % range_count;
-
-                        assembled_param.height_ranges.resize(range_count);
-                        for (int range_index = 0; range_index < range_count; range_index++)
-                        {
-                            height_range_info_t& height_range = assembled_param.height_ranges[range_index];
-                            height_range.min_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MIN_Z];
-                            height_range.max_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MAX_Z];
-                            height_range.range_params = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_RANGE_PARAMS].get<std::map<std::string, std::string>>();
-                        }
-                    }
-                    assemble_plate.assembled_param_list.emplace(assemble_index, std::move(assembled_param));
-                }
-                BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, has %2% plate params") % (plate_index + 1)  % assemble_plate.plate_params.size();
-            }
-        }
-    }
-    catch(std::exception &err) {
-        BOOST_LOG_TRIVIAL(error) << __FUNCTION__<< ": parse file "<<config_file<<" got a generic exception, reason = " << err.what();
-        ret = CLI_CONFIG_FILE_ERROR;
-    }
-
-    return ret;
-}
-
 void merge_or_add_object(assemble_plate_info_t& assemble_plate_info, Model &model, int assemble_index, std::map<int, ModelObject*> &merged_objects, ModelObject *ori_object)
 {
    if (assemble_index > 0) {
@@ -1863,6 +1707,14 @@ int CLI::run(int argc, char **argv)

                    BOOST_LOG_TRIVIAL(info) << boost::format("current_printer_name %1%, current_process_name %2%")%current_printer_name %current_process_name;
                    ConfigOptionStrings* option_strings = config.option<ConfigOptionStrings>("inherits_group");
+                    // One entry for the process, one per filament and one for the printer. A group of another
+                    // length still has the process first and the printer last; one too short for that is ignored.
+                    if (option_strings && option_strings->values.size() != current_filaments_name.size() + 2) {
+                        boost::nowide::cerr << "Warning: inherits_group has " << option_strings->values.size() << " entries, expected "
+                                            << current_filaments_name.size() + 2 << " for " << current_filaments_name.size() << " filaments" << std::endl;
+                        if (option_strings->values.size() < 2)
+                            option_strings = nullptr;
+                    }
                    if (option_strings) {
                        current_inherits_group = option_strings->values;
                        size_t size = current_inherits_group.size();
@@ -1884,16 +1736,13 @@ int CLI::run(int argc, char **argv)
                            BOOST_LOG_TRIVIAL(info) << boost::format("inherits of process valid, current_process_system_name is %1%") %current_process_system_name;
                        }

-                        current_filaments_system_name.resize(size - 2);
-                        for (int index = 1; index < (size - 1); index++) {
-                            if (current_inherits_group[index].empty()) {
-                                current_filaments_system_name[index-1] = current_filaments_name[index-1];
-                            }
-                            else {
+                        // A filament without an entry of its own counts as a system preset.
+                        current_filaments_system_name = current_filaments_name;
+                        for (size_t index = 1; index < size - 1 && index <= current_filaments_name.size(); index++) {
+                            if (!current_inherits_group[index].empty())
                                current_filaments_system_name[index-1] = current_inherits_group[index];
                        }
                    }
-                    }
                    else {
                        current_printer_system_name = current_printer_name;
                        current_process_system_name = current_process_name;
@@ -2023,7 +1872,12 @@ int CLI::run(int argc, char **argv)
        //parse the json and assemble object here
        Model model;

-        int ret = load_assemble_plate_list(load_assemble_list, assemble_plate_info_list);
+        AssembleListResult list_result = load_assemble_plate_list(load_assemble_list, assemble_plate_info_list, MAX_PLATE_COUNT);
+        int ret = CLI_SUCCESS;
+        if (list_result == AssembleListResult::FileNotFound)
+            ret = CLI_FILE_NOTFOUND;
+        else if (list_result == AssembleListResult::ConfigError)
+            ret = CLI_CONFIG_FILE_ERROR;
        if (ret) {
            record_exit_reson(outfile_dir, ret, 0, cli_errors[ret], sliced_info);
            flush_and_exit(ret);
@@ -4733,6 +4587,11 @@ int CLI::run(int argc, char **argv)
                record_exit_reson(outfile_dir, CLI_INVALID_PARAMS, 0, cli_errors[CLI_INVALID_PARAMS], sliced_info);
                flush_and_exit(CLI_INVALID_PARAMS);
            }
+            if (m_models.empty()) {
+                boost::nowide::cerr << "Invalid params: --assemble needs at least one input model." << std::endl;
+                record_exit_reson(outfile_dir, CLI_INVALID_PARAMS, 0, cli_errors[CLI_INVALID_PARAMS], sliced_info);
+                flush_and_exit(CLI_INVALID_PARAMS);
+            }
            Model m;
            ModelObject* new_object = m.add_object();
            new_object->name = _u8L("Assembly");
@@ -5673,7 +5532,7 @@ int CLI::run(int argc, char **argv)
                        float w = dynamic_cast<const ConfigOptionFloat *>(m_print_config.option("prime_tower_width"))->value;
                        float a = dynamic_cast<const ConfigOptionFloat *>(m_print_config.option("wipe_tower_rotation_angle"))->value;
                        float v = dynamic_cast<const ConfigOptionFloat *>(m_print_config.option("prime_volume"))->value;
-                        unsigned int filaments_cnt = plate_data_src[plate_to_slice-1]->slice_filaments_info.size();
+                        unsigned int filaments_cnt = (plate_data_src.size() >= static_cast<size_t>(plate_to_slice)) ? plate_data_src[plate_to_slice-1]->slice_filaments_info.size() : 0;
                        if ((filaments_cnt == 0) || need_skip)
                        {
                            // slice filaments info invalid
@@ -5,6 +5,7 @@

 #include "libslic3r/Config.hpp"
 #include "libslic3r/Model.hpp"
+#include "libslic3r/Format/AssembleList.hpp"

 namespace Slic3r {

@@ -19,64 +20,6 @@ namespace IO {
    };
 }

-#define JSON_ASSEMPLE_PLATES                   "plates"
-#define JSON_ASSEMPLE_PLATE_PARAMS             "plate_params"
-#define JSON_ASSEMPLE_PLATE_NAME               "plate_name"
-#define JSON_ASSEMPLE_PLATE_NEED_ARRANGE       "need_arrange"
-#define JSON_ASSEMPLE_OBJECTS                  "objects"
-#define JSON_ASSEMPLE_OBJECT_PATH              "path"
-#define JSON_ASSEMPLE_OBJECT_COUNT             "count"
-#define JSON_ASSEMPLE_OBJECT_FILAMENTS         "filaments"
-#define JSON_ASSEMPLE_OBJECT_POS_X             "pos_x"
-#define JSON_ASSEMPLE_OBJECT_POS_Y             "pos_y"
-#define JSON_ASSEMPLE_OBJECT_POS_Z             "pos_z"
-#define JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX    "assemble_index"
-#define JSON_ASSEMPLE_OBJECT_PRINT_PARAMS      "print_params"
-#define JSON_ASSEMPLE_ASSEMBLE_PARAMS         "assembled_params"
-
-
-#define JSON_ASSEMPLE_OBJECT_MIN_Z              "min_z"
-#define JSON_ASSEMPLE_OBJECT_MAX_Z              "max_z"
-#define JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES      "height_ranges"
-#define JSON_ASSEMPLE_OBJECT_RANGE_PARAMS       "range_params"
-
-typedef struct _height_range_info {
-    float         min_z;
-    float         max_z;
-
-    std::map<std::string, std::string> range_params;
-}height_range_info_t;
-
-typedef struct _assembled_param_info {
-    std::map<std::string, std::string> print_params;
-    std::vector<height_range_info_t> height_ranges;
-}assembled_param_info_t;
-
-typedef struct _assemble_object_info {
-    std::string         path;
-    int                 count;
-
-    std::vector<int>    filaments;
-    std::vector<int>    assemble_index;
-    std::vector<float>  pos_x;
-    std::vector<float>  pos_y;
-    std::vector<float>  pos_z;
-    std::map<std::string, std::string> print_params;
-    std::vector<height_range_info_t> height_ranges;
-}assemble_object_info_t;
-
-typedef struct _assemble_plate_info {
-    std::string         plate_name;
-    bool                need_arrange {false};
-    int                 filaments_count {0};
-
-    std::map<std::string, std::string> plate_params;
-    std::vector<assemble_object_info_t> assemble_obj_list;
-    std::vector<ModelObject *> loaded_obj_list;
-    std::map<int, assembled_param_info_t> assembled_param_list;
-}assemble_plate_info_t;
-
-
 typedef struct _printer_plate_info {
    std::string         printer_name;
    int                 printable_width{0};
@@ -205,6 +205,8 @@ set(lisbslic3r_sources
    Format/3mf.hpp
    Format/AMF.cpp
    Format/AMF.hpp
+    Format/AssembleList.cpp
+    Format/AssembleList.hpp
    Format/DRC.cpp
    Format/DRC.hpp
    Format/bbs_3mf.cpp
@@ -0,0 +1,204 @@
+#include "AssembleList.hpp"
+
+#include <algorithm>
+
+#include <boost/filesystem.hpp>
+#include <boost/format.hpp>
+#include <boost/log/trivial.hpp>
+#include <boost/nowide/fstream.hpp>
+
+#include "nlohmann/json.hpp"
+
+#define JSON_ASSEMPLE_PLATES                   "plates"
+#define JSON_ASSEMPLE_PLATE_PARAMS             "plate_params"
+#define JSON_ASSEMPLE_PLATE_NAME               "plate_name"
+#define JSON_ASSEMPLE_PLATE_NEED_ARRANGE       "need_arrange"
+#define JSON_ASSEMPLE_OBJECTS                  "objects"
+#define JSON_ASSEMPLE_OBJECT_PATH              "path"
+#define JSON_ASSEMPLE_OBJECT_COUNT             "count"
+#define JSON_ASSEMPLE_OBJECT_FILAMENTS         "filaments"
+#define JSON_ASSEMPLE_OBJECT_POS_X             "pos_x"
+#define JSON_ASSEMPLE_OBJECT_POS_Y             "pos_y"
+#define JSON_ASSEMPLE_OBJECT_POS_Z             "pos_z"
+#define JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX    "assemble_index"
+#define JSON_ASSEMPLE_OBJECT_PRINT_PARAMS      "print_params"
+#define JSON_ASSEMPLE_ASSEMBLE_PARAMS         "assembled_params"
+
+
+#define JSON_ASSEMPLE_OBJECT_MIN_Z              "min_z"
+#define JSON_ASSEMPLE_OBJECT_MAX_Z              "max_z"
+#define JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES      "height_ranges"
+#define JSON_ASSEMPLE_OBJECT_RANGE_PARAMS       "range_params"
+
+namespace Slic3r {
+
+using json = nlohmann::json;
+
+AssembleListResult load_assemble_plate_list(const std::string &config_file, std::vector<assemble_plate_info_t> &assemble_plate_info_list, int max_plate_count)
+{
+    AssembleListResult ret = AssembleListResult::Success;
+    boost::filesystem::path directory_path(config_file);
+
+    BOOST_LOG_TRIVIAL(info) << boost::format("%1% enter, file %2%")%__FUNCTION__ % config_file;
+    if (!boost::filesystem::exists(directory_path)) {
+        BOOST_LOG_TRIVIAL(error) << boost::format("directory %1% not exist.")%config_file;
+        return AssembleListResult::FileNotFound;
+    }
+
+    try {
+        json root_json;
+        boost::nowide::ifstream ifs(config_file);
+        ifs >> root_json;
+        ifs.close();
+
+        int plate_count = root_json[JSON_ASSEMPLE_PLATES].size();
+        if ((plate_count <= 0) || (plate_count > max_plate_count)) {
+            BOOST_LOG_TRIVIAL(error) << __FUNCTION__<< boost::format(": invalid plate count %1%")%plate_count;
+            return AssembleListResult::ConfigError;
+        }
+        assemble_plate_info_list.resize(plate_count);
+
+        for (int plate_index = 0; plate_index < plate_count; plate_index++)
+        {
+            assemble_plate_info_t &assemble_plate = assemble_plate_info_list[plate_index];
+            const json& plate_json = root_json[JSON_ASSEMPLE_PLATES][plate_index];
+            assemble_plate.plate_name = plate_json[JSON_ASSEMPLE_PLATE_NAME];
+            assemble_plate.need_arrange = plate_json[JSON_ASSEMPLE_PLATE_NEED_ARRANGE];
+
+            if (plate_json.contains(JSON_ASSEMPLE_PLATE_PARAMS)) {
+                assemble_plate.plate_params = plate_json[JSON_ASSEMPLE_PLATE_PARAMS].get<std::map<std::string, std::string>>();
+                BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, has %2% plate params") % (plate_index + 1)  % assemble_plate.plate_params.size();
+            }
+
+            int object_count = plate_json[JSON_ASSEMPLE_OBJECTS].size();
+            if (object_count <= 0) {
+                BOOST_LOG_TRIVIAL(error) << __FUNCTION__<< boost::format(": invalid object count %1% in plate %2%")%object_count %(plate_index+1);
+                return AssembleListResult::ConfigError;
+            }
+
+            assemble_plate.assemble_obj_list.resize(object_count);
+            for (int object_index = 0; object_index < object_count; object_index++)
+            {
+                assemble_object_info_t& assemble_object = assemble_plate.assemble_obj_list[object_index];
+                const json& object_json = plate_json[JSON_ASSEMPLE_OBJECTS][object_index];
+
+                assemble_object.path = object_json[JSON_ASSEMPLE_OBJECT_PATH];
+                assemble_object.count = object_json[JSON_ASSEMPLE_OBJECT_COUNT];
+
+                if (assemble_object.count <= 0) {
+                    BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": invalid object clone count %1% in plate %2% Object %3%") % assemble_object.count % (plate_index + 1) % assemble_object.path;
+                    return AssembleListResult::ConfigError;
+                }
+
+                assemble_object.filaments = object_json.at(JSON_ASSEMPLE_OBJECT_FILAMENTS).get<std::vector<int>>();
+                if (assemble_object.filaments.empty())
+                {
+                    BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s filaments list is empty") % assemble_object.path;
+                    return AssembleListResult::ConfigError;
+                }
+                if ((assemble_object.filaments.size() != assemble_object.count) && (assemble_object.filaments.size() != 1))
+                {
+                    BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s filaments count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.filaments.size() % assemble_object.count;
+                    return AssembleListResult::ConfigError;
+                }
+                // 0 keeps the default filament, as it does for --load-filament-ids.
+                if (std::any_of(assemble_object.filaments.begin(), assemble_object.filaments.end(), [](int id) { return id < 0; }))
+                {
+                    BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1% has a negative filament id") % assemble_object.path;
+                    return AssembleListResult::ConfigError;
+                }
+
+                if (object_json.contains(JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX)) {
+                    assemble_object.assemble_index = object_json[JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX].get<std::vector<int>>();
+                    if ((assemble_object.assemble_index.size() > 0) && (assemble_object.assemble_index.size() != assemble_object.count) && (assemble_object.assemble_index.size() != 1))
+                    {
+                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s assemble_index count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.assemble_index.size() % assemble_object.count;
+                        return AssembleListResult::ConfigError;
+                    }
+                }
+
+                if (object_json.contains(JSON_ASSEMPLE_OBJECT_POS_X)) {
+                    assemble_object.pos_x = object_json[JSON_ASSEMPLE_OBJECT_POS_X].get<std::vector<float>>();
+                    if ((assemble_object.pos_x.size() > 0) && (assemble_object.pos_x.size() != assemble_object.count) && (assemble_object.pos_x.size() != 1))
+                    {
+                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s pos_x count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.pos_x.size() % assemble_object.count;
+                        return AssembleListResult::ConfigError;
+                    }
+                }
+                if (object_json.contains(JSON_ASSEMPLE_OBJECT_POS_Y)) {
+                    assemble_object.pos_y = object_json[JSON_ASSEMPLE_OBJECT_POS_Y].get<std::vector<float>>();
+                    if ((assemble_object.pos_y.size() > 0) && (assemble_object.pos_y.size() != assemble_object.count) && (assemble_object.pos_y.size() != 1))
+                    {
+                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s pos_y count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.pos_y.size() % assemble_object.count;
+                        return AssembleListResult::ConfigError;
+                    }
+                }
+                if (object_json.contains(JSON_ASSEMPLE_OBJECT_POS_Z)) {
+                    assemble_object.pos_z = object_json[JSON_ASSEMPLE_OBJECT_POS_Z].get<std::vector<float>>();
+                    if ((assemble_object.pos_z.size() > 0) && (assemble_object.pos_z.size() != assemble_object.count) && (assemble_object.pos_z.size() != 1))
+                    {
+                        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << boost::format(": object %1%'s pos_z count %2% not equal to clone count %3%, also not equal to 1") % assemble_object.path % assemble_object.pos_z.size() % assemble_object.count;
+                        return AssembleListResult::ConfigError;
+                    }
+                }
+                if (object_json.contains(JSON_ASSEMPLE_OBJECT_PRINT_PARAMS)) {
+                    assemble_object.print_params = object_json[JSON_ASSEMPLE_OBJECT_PRINT_PARAMS].get<std::map<std::string, std::string>>();
+                    BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, object %2% has %3% print params") % (plate_index + 1) %assemble_object.path % assemble_object.print_params.size();
+                }
+                if (object_json.contains(JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES)) {
+                    json height_range_json = object_json[JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES];
+                    int range_count = height_range_json.size();
+
+                    BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, object %2% has %3% height ranges") % (plate_index + 1) %assemble_object.path % range_count;
+
+                    assemble_object.height_ranges.resize(range_count);
+                    for (int range_index = 0; range_index < range_count; range_index++)
+                    {
+                        height_range_info_t& height_range = assemble_object.height_ranges[range_index];
+                        height_range.min_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MIN_Z];
+                        height_range.max_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MAX_Z];
+                        height_range.range_params = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_RANGE_PARAMS].get<std::map<std::string, std::string>>();
+                    }
+                }
+            }
+            if (plate_json.contains(JSON_ASSEMPLE_ASSEMBLE_PARAMS)) {
+                json assemble_params_json = plate_json[JSON_ASSEMPLE_ASSEMBLE_PARAMS];
+                int assemble_count = assemble_params_json.size();
+                for (int i = 0; i < assemble_count; i++)
+                {
+                    assembled_param_info_t assembled_param;
+                    int assemble_index = assemble_params_json[i][JSON_ASSEMPLE_OBJECT_ASSEMBLE_INDEX];
+                    if (assemble_params_json[i].contains(JSON_ASSEMPLE_OBJECT_PRINT_PARAMS)) {
+                        assembled_param.print_params = assemble_params_json[i][JSON_ASSEMPLE_OBJECT_PRINT_PARAMS].get<std::map<std::string, std::string>>();
+                        BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, assemble object %2% has %3% print params") % (plate_index + 1) %i % assembled_param.print_params.size();
+                    }
+                    if (assemble_params_json[i].contains(JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES)) {
+                        json height_range_json = assemble_params_json[i][JSON_ASSEMPLE_OBJECT_HEIGHT_RANGES];
+                        int range_count = height_range_json.size();
+
+                        BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, assemble object %2% has %3% height ranges") % (plate_index + 1) %i % range_count;
+
+                        assembled_param.height_ranges.resize(range_count);
+                        for (int range_index = 0; range_index < range_count; range_index++)
+                        {
+                            height_range_info_t& height_range = assembled_param.height_ranges[range_index];
+                            height_range.min_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MIN_Z];
+                            height_range.max_z = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_MAX_Z];
+                            height_range.range_params = height_range_json[range_index][JSON_ASSEMPLE_OBJECT_RANGE_PARAMS].get<std::map<std::string, std::string>>();
+                        }
+                    }
+                    assemble_plate.assembled_param_list.emplace(assemble_index, std::move(assembled_param));
+                }
+                BOOST_LOG_TRIVIAL(debug) << boost::format("Plate %1%, has %2% plate params") % (plate_index + 1)  % assemble_plate.plate_params.size();
+            }
+        }
+    }
+    catch(std::exception &err) {
+        BOOST_LOG_TRIVIAL(error) << __FUNCTION__<< ": parse file "<<config_file<<" got a generic exception, reason = " << err.what();
+        ret = AssembleListResult::ConfigError;
+    }
+
+    return ret;
+}
+
+} // namespace Slic3r
@@ -0,0 +1,60 @@
+#ifndef slic3r_Format_AssembleList_hpp_
+#define slic3r_Format_AssembleList_hpp_
+
+#include <map>
+#include <string>
+#include <vector>
+
+namespace Slic3r {
+
+class ModelObject;
+
+typedef struct _height_range_info {
+    float         min_z;
+    float         max_z;
+
+    std::map<std::string, std::string> range_params;
+}height_range_info_t;
+
+typedef struct _assembled_param_info {
+    std::map<std::string, std::string> print_params;
+    std::vector<height_range_info_t> height_ranges;
+}assembled_param_info_t;
+
+typedef struct _assemble_object_info {
+    std::string         path;
+    int                 count;
+
+    std::vector<int>    filaments;
+    std::vector<int>    assemble_index;
+    std::vector<float>  pos_x;
+    std::vector<float>  pos_y;
+    std::vector<float>  pos_z;
+    std::map<std::string, std::string> print_params;
+    std::vector<height_range_info_t> height_ranges;
+}assemble_object_info_t;
+
+typedef struct _assemble_plate_info {
+    std::string         plate_name;
+    bool                need_arrange {false};
+    int                 filaments_count {0};
+
+    std::map<std::string, std::string> plate_params;
+    std::vector<assemble_object_info_t> assemble_obj_list;
+    std::vector<ModelObject *> loaded_obj_list;
+    std::map<int, assembled_param_info_t> assembled_param_list;
+}assemble_plate_info_t;
+
+enum class AssembleListResult {
+    Success,
+    FileNotFound,
+    // Malformed JSON, a missing required field, or a value that fails validation.
+    ConfigError
+};
+
+// Read the JSON assemble list used by the CLI's --load-assemble-list into one entry per plate.
+AssembleListResult load_assemble_plate_list(const std::string &config_file, std::vector<assemble_plate_info_t> &assemble_plate_info_list, int max_plate_count);
+
+} // namespace Slic3r
+
+#endif /* slic3r_Format_AssembleList_hpp_ */
@@ -15,3 +15,10 @@ set_tests_properties(cli_strict_mode PROPERTIES
    LABELS "CLI;RequiresApp"
    SKIP_RETURN_CODE 77
    TIMEOUT 900)
+
+add_test(NAME cli_malformed_input
+    COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/test_cli_malformed_input.sh $<TARGET_FILE:OrcaSlicer> ${ORCA_CLI_TEST_PYTHON})
+set_tests_properties(cli_malformed_input PROPERTIES
+    LABELS "CLI;RequiresApp"
+    SKIP_RETURN_CODE 77
+    TIMEOUT 900)
@@ -0,0 +1,207 @@
+#!/usr/bin/env bash
+# End-to-end checks that malformed CLI input fails cleanly, or loads, instead of crashing the
+# orca-slicer binary. Each case lives inline in CLI::run(), so only the binary can reach it.
+#
+# - A project whose inherits_group does not have one entry per filament plus the process and
+#   printer entries still loads.
+# - --slice N --arrange 1 on a project without plate metadata slices plate N.
+# - An assemble list object with an empty filament list, or a negative filament id, is rejected
+#   as a config error.
+# - --assemble with no input model is rejected as invalid parameters.
+#
+# usage: test_cli_malformed_input.sh <orca-slicer binary> <python3>
+set -u
+
+BIN="${1:-}"
+PY="${2:-python3}"
+# 77 is the test's SKIP_RETURN_CODE.
+[ -x "$BIN" ] || { echo "SKIP: orca-slicer binary not found: $BIN"; exit 77; }
+
+# From src/libslic3r/Utils.hpp. main() returns them, so the shell sees them modulo 256.
+CLI_SUCCESS=0
+CLI_INVALID_PARAMS=-2
+CLI_CONFIG_FILE_ERROR=-5
+
+WORK="$(mktemp -d "${TMPDIR:-/tmp}/orca-cli-malformed.XXXXXX")"
+trap 'rm -rf "$WORK"' EXIT
+mkdir -p "$WORK/datadir"
+
+# Standalone presets: without "inherits" the CLI loads them as-is, with no preset bundle.
+cat > "$WORK/machine.json" <<'EOF'
+{
+    "type": "machine",
+    "from": "User",
+    "name": "CLI malformed input test printer",
+    "printable_area": ["0x0", "200x0", "200x200", "0x200"],
+    "printable_height": "100",
+    "layer_change_gcode": "G92 E0"
+}
+EOF
+cat > "$WORK/process.json" <<'EOF'
+{
+    "type": "process",
+    "from": "User",
+    "name": "CLI malformed input test process"
+}
+EOF
+cat > "$WORK/filament.json" <<'EOF'
+{
+    "type": "filament",
+    "from": "User",
+    "name": "CLI malformed input test filament"
+}
+EOF
+
+"$PY" - "$WORK/cube.stl" <<'EOF'
+import sys
+
+v = [(x, y, z) for z in (0, 10) for y in (0, 10) for x in (0, 10)]
+with open(sys.argv[1], "w") as f:
+    f.write("solid cube\n")
+    # Faces wound counter-clockwise seen from outside: -z, +z, -y, +y, -x, +x.
+    for a, b, c, d in ((0, 2, 3, 1), (4, 5, 7, 6), (0, 1, 5, 4), (2, 6, 7, 3), (0, 4, 6, 2), (1, 3, 7, 5)):
+        for tri in ((a, b, c), (a, c, d)):
+            f.write("facet normal 0 0 0\nouter loop\n")
+            for i in tri:
+                f.write("vertex %g %g %g\n" % v[i])
+            f.write("endloop\nendfacet\n")
+    f.write("endsolid cube\n")
+EOF
+
+fails=0
+fail() { echo "FAIL: $*"; fails=$((fails + 1)); }
+
+# run <tag> [option...]: run into $WORK/<tag>, keeping the log and the shell status there.
+run() {
+    local out="$WORK/$1"; shift
+    mkdir -p "$out"
+    timeout 300 "$BIN" --datadir "$WORK/datadir" --outputdir "$out" "$@" > "$out/log" 2>&1
+    echo $? > "$out/status"
+}
+
+# run_presets <tag> [option...]: run with the standalone presets loaded.
+run_presets() {
+    local tag="$1"; shift
+    run "$tag" --load-settings "$WORK/machine.json;$WORK/process.json" --load-filaments "$WORK/filament.json" "$@"
+}
+
+# expect_status <tag> <cli code>
+expect_status() {
+    local got; got="$(cat "$WORK/$1/status")"
+    [ "$got" -eq $(( $2 & 255 )) ] || fail "$1: shell status $got, want $(( $2 & 255 )) (code $2)"
+}
+
+# expect_result <tag> <return_code>: a failing run must also carry an error_string.
+expect_result() {
+    "$PY" - "$WORK/$1/result.json" "$2" <<'EOF' || fail "$1: result.json"
+import json, sys
+
+try:
+    with open(sys.argv[1]) as f:
+        result = json.load(f)
+except (OSError, ValueError) as e:
+    sys.exit("cannot read %s: %s" % (sys.argv[1], e))
+want_rc = int(sys.argv[2])
+if result.get("return_code") != want_rc:
+    sys.exit("return_code %r, want %d" % (result.get("return_code"), want_rc))
+if want_rc != 0 and not result.get("error_string"):
+    sys.exit("no error_string")
+EOF
+}
+
+# expect_log <tag> <text>
+expect_log() {
+    grep -qF -- "$2" "$WORK/$1/log" || fail "$1: log does not mention \"$2\""
+}
+
+# expect_gcode <tag>
+expect_gcode() {
+    compgen -G "$WORK/$1/*.gcode" > /dev/null || fail "$1: no G-code was exported"
+}
+
+# rewrite_3mf <in> <out> inherits <json list> | no-plates
+rewrite_3mf() {
+    "$PY" - "$@" <<'EOF'
+import json, re, sys, zipfile
+
+src, dst, mode = sys.argv[1:4]
+with zipfile.ZipFile(src) as zin, zipfile.ZipFile(dst, "w", zipfile.ZIP_DEFLATED) as zout:
+    for info in zin.infolist():
+        data = zin.read(info.filename)
+        if mode == "inherits" and info.filename == "Metadata/project_settings.config":
+            config = json.loads(data)
+            config["inherits_group"] = json.loads(sys.argv[4])
+            data = json.dumps(config, indent=4).encode()
+        elif mode == "no-plates":
+            if re.match(r"Metadata/plate_\d+\.", info.filename):
+                continue
+            if info.filename == "Metadata/model_settings.config":
+                data = re.sub(rb"\s*<plate>.*?</plate>", b"", data, flags=re.S)
+        zout.writestr(info, data)
+EOF
+}
+
+# assemble_list <file> <filaments json>
+assemble_list() {
+    cat > "$1" <<EOF
+{"plates": [{"plate_name": "p", "need_arrange": false,
+             "objects": [{"path": "$WORK/cube.stl", "count": 1, "filaments": $2,
+                          "pos_x": [100], "pos_y": [100]}]}]}
+EOF
+}
+
+echo "== a one-filament project exported by the CLI is the base for the project cases"
+run_presets export --slice 0 --export-3mf project.3mf "$WORK/cube.stl"
+expect_status export $CLI_SUCCESS
+[ -f "$WORK/export/project.3mf" ] || { echo "FAIL: project export failed"; tail -n 40 "$WORK/export/log"; exit 1; }
+
+echo "== an inherits_group of the wrong length still loads"
+for group in '[]' '[""]' '["", "", "", "", ""]'; do
+    tag="inherits_$("$PY" -c 'import json, sys; print(len(json.loads(sys.argv[1])))' "$group")"
+    rewrite_3mf "$WORK/export/project.3mf" "$WORK/$tag.3mf" inherits "$group"
+    run "$tag" --info "$WORK/$tag.3mf"
+    expect_status "$tag" $CLI_SUCCESS
+    expect_log "$tag" "inherits_group"
+done
+
+echo "== --slice 1 --arrange 1 slices a project without plate metadata"
+rewrite_3mf "$WORK/export/project.3mf" "$WORK/no_plates.3mf" no-plates
+run_presets no_plates --slice 1 --arrange 1 "$WORK/no_plates.3mf"
+expect_status no_plates $CLI_SUCCESS
+expect_result no_plates $CLI_SUCCESS
+expect_gcode no_plates
+
+echo "== an assemble list with a valid filament id slices"
+assemble_list "$WORK/assemble_valid.json" '[1]'
+run_presets assemble_valid --slice 0 --load-assemble-list "$WORK/assemble_valid.json"
+expect_status assemble_valid $CLI_SUCCESS
+expect_gcode assemble_valid
+
+echo "== an assemble list with an empty filament list or a negative filament id is rejected"
+for filaments in '[]' '[-1]'; do
+    if [ "$filaments" = '[]' ]; then tag=assemble_empty; else tag=assemble_negative; fi
+    assemble_list "$WORK/$tag.json" "$filaments"
+    run_presets "$tag" --slice 0 --load-assemble-list "$WORK/$tag.json"
+    expect_status "$tag" $CLI_CONFIG_FILE_ERROR
+    expect_result "$tag" $CLI_CONFIG_FILE_ERROR
+done
+
+echo "== --assemble with no input model is rejected"
+for action in "--slice 0" "--export-3mf out.3mf"; do
+    tag="assemble_no_input_${action%% *}"
+    tag="${tag//-/}"
+    # shellcheck disable=SC2086
+    run_presets "$tag" --assemble $action
+    expect_status "$tag" $CLI_INVALID_PARAMS
+    expect_result "$tag" $CLI_INVALID_PARAMS
+    expect_log "$tag" "--assemble"
+done
+
+if [ "$fails" -ne 0 ]; then
+    for log in "$WORK"/*/log; do
+        echo "--- $log"
+        tail -n 40 "$log"
+    done
+    exit 1
+fi
+echo "PASS"
@@ -7,6 +7,7 @@ add_executable(${_TEST_NAME}_tests
    test_appconfig.cpp
    test_arachne_walls.cpp
    test_arrange.cpp
+    test_assemble_list.cpp
    test_bambu_networking.cpp
    test_buildvolume.cpp
    test_calib.cpp
@@ -0,0 +1,266 @@
+#include <catch2/catch_all.hpp>
+
+#include "libslic3r/Format/AssembleList.hpp"
+
+#include "test_utils.hpp"
+
+#include <boost/nowide/fstream.hpp>
+#include <nlohmann/json.hpp>
+
+#include <string>
+#include <vector>
+
+using namespace Slic3r;
+using Catch::Matchers::WithinAbs;
+using nlohmann::json;
+
+static constexpr int max_plates = 36;
+
+static AssembleListResult load_text(const std::string &text, std::vector<assemble_plate_info_t> &plates)
+{
+    ScopedTemporaryFile file(".json");
+    {
+        boost::nowide::ofstream out(file.string());
+        out << text;
+    }
+    return load_assemble_plate_list(file.string(), plates, max_plates);
+}
+
+static AssembleListResult load_json(const json &root)
+{
+    std::vector<assemble_plate_info_t> plates;
+    return load_text(root.dump(), plates);
+}
+
+// One plate with one object of three clones, which every optional field accepts.
+static json valid_list()
+{
+    return json::parse(R"({
+        "plates": [{
+            "plate_name": "plate",
+            "need_arrange": false,
+            "objects": [{
+                "path": "cube.stl",
+                "count": 3,
+                "filaments": [1],
+                "height_ranges": [{ "min_z": 0, "max_z": 5, "range_params": { "layer_height": "0.1" } }]
+            }],
+            "assembled_params": [{
+                "assemble_index": 1,
+                "height_ranges": [{ "min_z": 0, "max_z": 5, "range_params": { "layer_height": "0.1" } }]
+            }]
+        }]
+    })");
+}
+
+TEST_CASE("A valid assemble list parses into its plates and objects", "[AssembleList]")
+{
+    const std::string text = R"({
+        "plates": [
+            {
+                "plate_name": "first",
+                "need_arrange": true,
+                "plate_params": { "curr_bed_type": "Textured PEI Plate" },
+                "objects": [
+                    {
+                        "path": "a.stl",
+                        "count": 2,
+                        "filaments": [1, 3],
+                        "assemble_index": [1],
+                        "pos_x": [10.5, 20.5],
+                        "pos_y": [30],
+                        "pos_z": [0, 1],
+                        "print_params": { "sparse_infill_density": "30%" },
+                        "height_ranges": [{ "min_z": 1.5, "max_z": 4, "range_params": { "layer_height": "0.12" } }]
+                    },
+                    { "path": "b.stl", "count": 1, "filaments": [0] }
+                ],
+                "assembled_params": [{ "assemble_index": 1, "print_params": { "wall_loops": "4" } }]
+            },
+            {
+                "plate_name": "second",
+                "need_arrange": false,
+                "objects": [{ "path": "c.stl", "count": 1, "filaments": [2] }]
+            }
+        ]
+    })";
+    std::vector<assemble_plate_info_t> plates;
+    REQUIRE(load_text(text, plates) == AssembleListResult::Success);
+    REQUIRE(plates.size() == 2);
+
+    const assemble_plate_info_t &first = plates[0];
+    CHECK(first.plate_name == "first");
+    CHECK(first.need_arrange);
+    CHECK(first.plate_params.at("curr_bed_type") == "Textured PEI Plate");
+    REQUIRE(first.assemble_obj_list.size() == 2);
+
+    const assemble_object_info_t &a = first.assemble_obj_list[0];
+    CHECK(a.path == "a.stl");
+    CHECK(a.count == 2);
+    CHECK(a.filaments == std::vector<int>{1, 3});
+    CHECK(a.assemble_index == std::vector<int>{1});
+    REQUIRE(a.pos_x.size() == 2);
+    CHECK_THAT(a.pos_x[0], WithinAbs(10.5, 1e-6));
+    CHECK_THAT(a.pos_x[1], WithinAbs(20.5, 1e-6));
+    REQUIRE(a.pos_y.size() == 1);
+    CHECK_THAT(a.pos_y[0], WithinAbs(30., 1e-6));
+    REQUIRE(a.pos_z.size() == 2);
+    CHECK_THAT(a.pos_z[1], WithinAbs(1., 1e-6));
+    CHECK(a.print_params.at("sparse_infill_density") == "30%");
+    REQUIRE(a.height_ranges.size() == 1);
+    CHECK_THAT(a.height_ranges[0].min_z, WithinAbs(1.5, 1e-6));
+    CHECK_THAT(a.height_ranges[0].max_z, WithinAbs(4., 1e-6));
+    CHECK(a.height_ranges[0].range_params.at("layer_height") == "0.12");
+
+    const assemble_object_info_t &b = first.assemble_obj_list[1];
+    CHECK(b.path == "b.stl");
+    CHECK(b.count == 1);
+    CHECK(b.filaments == std::vector<int>{0});
+    CHECK(b.pos_x.empty());
+    CHECK(b.assemble_index.empty());
+
+    REQUIRE(first.assembled_param_list.count(1) == 1);
+    CHECK(first.assembled_param_list.at(1).print_params.at("wall_loops") == "4");
+
+    const assemble_plate_info_t &second = plates[1];
+    CHECK(second.plate_name == "second");
+    CHECK_FALSE(second.need_arrange);
+    REQUIRE(second.assemble_obj_list.size() == 1);
+    CHECK(second.assemble_obj_list[0].path == "c.stl");
+    CHECK(second.assemble_obj_list[0].filaments == std::vector<int>{2});
+}
+
+TEST_CASE("The unmodified fixture used by the rule tests is accepted", "[AssembleList]")
+{
+    CHECK(load_json(valid_list()) == AssembleListResult::Success);
+}
+
+TEST_CASE("An object with an empty filament list is rejected", "[AssembleList]")
+{
+    json root = valid_list();
+    root["plates"][0]["objects"][0]["filaments"] = json::array();
+    CHECK(load_json(root) == AssembleListResult::ConfigError);
+}
+
+TEST_CASE("An object with a negative filament id is rejected", "[AssembleList]")
+{
+    json root = valid_list();
+    root["plates"][0]["objects"][0]["filaments"] = GENERATE(json::array({-1}), json::array({1, -2, 1}));
+    CAPTURE(root["plates"][0]["objects"][0]["filaments"].dump());
+    CHECK(load_json(root) == AssembleListResult::ConfigError);
+}
+
+TEST_CASE("Filament id 0 is accepted", "[AssembleList]")
+{
+    json root = valid_list();
+    root["plates"][0]["objects"][0]["filaments"] = GENERATE(json::array({0}), json::array({0, 1, 0}));
+    CAPTURE(root["plates"][0]["objects"][0]["filaments"].dump());
+    CHECK(load_json(root) == AssembleListResult::Success);
+}
+
+TEST_CASE("Per-clone lists need one entry or one per clone", "[AssembleList]")
+{
+    // The fixture object has 3 clones.
+    const std::string key  = GENERATE("filaments", "assemble_index", "pos_x", "pos_y", "pos_z");
+    const size_t      size = GENERATE(1, 2, 3, 4);
+    CAPTURE(key, size);
+
+    json root = valid_list();
+    root["plates"][0]["objects"][0][key] = json(std::vector<int>(size, 1));
+    const AssembleListResult expected = (size == 1 || size == 3) ? AssembleListResult::Success : AssembleListResult::ConfigError;
+    CHECK(load_json(root) == expected);
+}
+
+TEST_CASE("An empty optional per-clone list is accepted", "[AssembleList]")
+{
+    const std::string key = GENERATE("assemble_index", "pos_x", "pos_y", "pos_z");
+    CAPTURE(key);
+
+    json root = valid_list();
+    root["plates"][0]["objects"][0][key] = json::array();
+    CHECK(load_json(root) == AssembleListResult::Success);
+}
+
+// Fields read through a const reference (plate_name, need_arrange, objects, path, count) are
+// looked up without a presence check, so only their wrong-type case is covered here.
+TEST_CASE("A missing required field is rejected", "[AssembleList]")
+{
+    const std::string pointer = GENERATE("/plates",
+                                         "/plates/0/objects/0/filaments",
+                                         "/plates/0/objects/0/height_ranges/0/min_z",
+                                         "/plates/0/objects/0/height_ranges/0/max_z",
+                                         "/plates/0/objects/0/height_ranges/0/range_params",
+                                         "/plates/0/assembled_params/0/assemble_index",
+                                         "/plates/0/assembled_params/0/height_ranges/0/min_z",
+                                         "/plates/0/assembled_params/0/height_ranges/0/max_z",
+                                         "/plates/0/assembled_params/0/height_ranges/0/range_params");
+    CAPTURE(pointer);
+
+    json root = valid_list();
+    const json::json_pointer ptr(pointer);
+    root[ptr.parent_pointer()].erase(ptr.back());
+    CHECK(load_json(root) == AssembleListResult::ConfigError);
+}
+
+TEST_CASE("A field of the wrong type is rejected", "[AssembleList]")
+{
+    const std::string pointer = GENERATE("/plates/0/plate_name",
+                                         "/plates/0/need_arrange",
+                                         "/plates/0/objects/0/path",
+                                         "/plates/0/objects/0/count",
+                                         "/plates/0/objects/0/filaments",
+                                         "/plates/0/objects/0/pos_x");
+    CAPTURE(pointer);
+
+    json root = valid_list();
+    root[json::json_pointer(pointer)] = json::object();
+    CHECK(load_json(root) == AssembleListResult::ConfigError);
+}
+
+TEST_CASE("A plate or clone count out of range is rejected", "[AssembleList]")
+{
+    SECTION("no plates")
+    {
+        json root = valid_list();
+        root["plates"] = json::array();
+        CHECK(load_json(root) == AssembleListResult::ConfigError);
+    }
+    SECTION("more plates than the limit")
+    {
+        json root = valid_list();
+        const json plate = root["plates"][0];
+        for (int i = 1; i < max_plates; ++i)
+            root["plates"].push_back(plate);
+        CHECK(load_json(root) == AssembleListResult::Success);
+        root["plates"].push_back(plate);
+        CHECK(load_json(root) == AssembleListResult::ConfigError);
+    }
+    SECTION("a plate with no objects")
+    {
+        json root = valid_list();
+        root["plates"][0]["objects"] = json::array();
+        CHECK(load_json(root) == AssembleListResult::ConfigError);
+    }
+    SECTION("a clone count below 1")
+    {
+        json root = valid_list();
+        root["plates"][0]["objects"][0]["count"] = GENERATE(0, -1);
+        CAPTURE(root["plates"][0]["objects"][0]["count"].dump());
+        CHECK(load_json(root) == AssembleListResult::ConfigError);
+    }
+}
+
+TEST_CASE("Malformed JSON is rejected", "[AssembleList]")
+{
+    const std::string text = GENERATE(std::string(), std::string("{\"plates\": ["), std::string("not json"));
+    CAPTURE(text);
+    std::vector<assemble_plate_info_t> plates;
+    CHECK(load_text(text, plates) == AssembleListResult::ConfigError);
+}
+
+TEST_CASE("A missing file is reported as not found", "[AssembleList]")
+{
+    ScopedTemporaryFile        file(".json");
+    std::vector<assemble_plate_info_t> plates;
+    CHECK(load_assemble_plate_list(file.string(), plates, max_plates) == AssembleListResult::FileNotFound);
+}