diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index fe60769e7..91a69d544 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -13712,33 +13712,32 @@ void Plater::update_flush_volume_matrix(size_t old_nozzle_size, size_t new_nozzl
 
     assert(nozzle_nums == new_nozzle_size);
     if (old_nozzle_size < new_nozzle_size) {
-        std::vector<double>        flush_volume_mtx = get_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, -1, old_nozzle_size);
-        std::vector<double>  first_flush_volume_mtx = get_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, 0, old_nozzle_size);
-        first_flush_volume_mtx.resize(filament_nums * filament_nums);
 
-        std::vector<double> flush_multipliers = project_config->option<ConfigOptionFloats>("flush_multiplier")->values;
-        double first_flush_multiplier = project_config->option<ConfigOptionFloats>("flush_multiplier")->values.at(0);
-
-        flush_volume_mtx.clear();
-        for (size_t i = 0; i < new_nozzle_size; ++i) {
-            flush_volume_mtx.insert(flush_volume_mtx.end(), first_flush_volume_mtx.begin(), first_flush_volume_mtx.end());
+        std::vector<double>  first_flush_volume_mtx = get_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, -1, old_nozzle_size);
+        if (first_flush_volume_mtx.size() == filament_nums * filament_nums * new_nozzle_size) { // load file
+            set_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, first_flush_volume_mtx, -1, new_nozzle_size);
+        } else {
+            first_flush_volume_mtx.resize(filament_nums * filament_nums);
+            std::vector<double> flush_volume_mtx;
+            for (size_t i = 0; i < new_nozzle_size; ++i) {
+                flush_volume_mtx.insert(flush_volume_mtx.end(), first_flush_volume_mtx.begin(), first_flush_volume_mtx.end());
+            }
+            set_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, flush_volume_mtx, -1, new_nozzle_size);
         }
-
+        std::vector<double> flush_multipliers = project_config->option<ConfigOptionFloats>("flush_multiplier")->values;
         flush_multipliers.resize(nozzle_nums, 1.f);
-
-        set_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, flush_volume_mtx, -1, new_nozzle_size);
         project_config->option<ConfigOptionFloats>("flush_multiplier")->values = flush_multipliers;
     }
     else if (old_nozzle_size > new_nozzle_size) {
         std::vector<double> new_flush_volume_mtx;
         for (size_t i = 0; i < new_nozzle_size; ++i) {
-            std::vector<double> flush_volume_mtx = get_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, i, old_nozzle_size);
+            std::vector<double> flush_volume_mtx = get_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, -1, old_nozzle_size);
             flush_volume_mtx.resize(filament_nums * filament_nums);
             new_flush_volume_mtx.insert(new_flush_volume_mtx.end(), flush_volume_mtx.begin(), flush_volume_mtx.end());
         }
 
         std::vector<double> flush_multipliers = project_config->option<ConfigOptionFloats>("flush_multiplier")->values;
-        flush_multipliers.resize(nozzle_nums);
+        flush_multipliers.resize(nozzle_nums, 1.f);
         set_flush_volumes_matrix(project_config->option<ConfigOptionFloats>("flush_volumes_matrix")->values, new_flush_volume_mtx, -1, new_nozzle_size);
         project_config->option<ConfigOptionFloats>("flush_multiplier")->values = flush_multipliers;
     }