diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index 5b62c8aa6..a837639f4 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -2853,6 +2853,12 @@ void PartPlate::set_filament_maps(const std::vector<int>& f_maps)
     filament_maps = f_maps;
 }
 
+void PartPlate::on_extruder_count_changed(int extruder_count)
+{
+    std::vector<int>& filament_maps = m_config.option<ConfigOptionInts>("filament_map", true)->values;
+    std::fill(filament_maps.begin(), filament_maps.end(), 1);
+}
+
 void PartPlate::set_filament_count(int filament_count)
 {
     std::vector<int>& filament_maps = m_config.option<ConfigOptionInts>("filament_map", true)->values;
@@ -2865,7 +2871,6 @@ void PartPlate::on_filament_added()
     filament_maps.push_back(1);
 }
 
-
 void PartPlate::on_filament_deleted(int filament_count, int filament_id)
 {
     std::vector<int>& filament_maps = m_config.option<ConfigOptionInts>("filament_map", true)->values;
@@ -5911,6 +5916,14 @@ void PartPlateList::load_cali_textures()
 	PartPlateList::is_load_cali_texture = true;
 }
 
+void PartPlateList::on_extruder_count_changed(int extruder_count)
+{
+    for (unsigned int i = 0; i < (unsigned int) m_plate_list.size(); ++i) {
+        m_plate_list[i]->on_extruder_count_changed(extruder_count);
+    }
+    BOOST_LOG_TRIVIAL(info) << boost::format("%1%: extruder_count=%2%")% __FUNCTION__ %extruder_count;
+}
+
 void PartPlateList::set_filament_count(int filament_count)
 {
     m_filament_count = filament_count;
diff --git a/src/slic3r/GUI/PartPlate.hpp b/src/slic3r/GUI/PartPlate.hpp
index 15d2a1d91..f407d52d8 100644
--- a/src/slic3r/GUI/PartPlate.hpp
+++ b/src/slic3r/GUI/PartPlate.hpp
@@ -482,6 +482,7 @@ public:
     std::vector<int> get_filament_maps();
     void set_filament_maps(const std::vector<int>& f_maps);
 
+    void on_extruder_count_changed(int extruder_count);
     void set_filament_count(int filament_count);
     void on_filament_added();
     void on_filament_deleted(int filament_count, int filament_id);
@@ -914,6 +915,8 @@ public:
     void init_cali_texture_info();
     void load_cali_textures();
 
+    void on_extruder_count_changed(int extruder_count);
+
     void set_filament_count(int filament_count);
     void on_filament_deleted(int filament_count, int filament_id);
     void on_filament_added(int filament_count);
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 2dd5c55e9..8c29f0bc3 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -3816,6 +3816,8 @@ void TabPrinter::extruders_count_changed(size_t extruders_count)
         m_preset_bundle->printers.get_edited_preset().set_num_extruders(extruders_count);
         m_preset_bundle->update_multi_material_filament_presets();
         is_count_changed = true;
+
+        wxGetApp().plater()->get_partplate_list().on_extruder_count_changed((int)m_extruders_count);
     }
     // BBS
 #if 1