diff --git a/src/slic3r/GUI/SelectMachine.cpp b/src/slic3r/GUI/SelectMachine.cpp
index 05d71de18..ba7234511 100644
--- a/src/slic3r/GUI/SelectMachine.cpp
+++ b/src/slic3r/GUI/SelectMachine.cpp
@@ -1087,7 +1087,7 @@ void SelectMachineDialog::sync_ams_mapping_result(std::vector<FilamentInfo> &res
     if (result.empty()) {
         BOOST_LOG_TRIVIAL(trace) << "ams_mapping result is empty";
         for (auto it = m_materialList.begin(); it != m_materialList.end(); it++) {
-            wxString ams_id = "-";
+            wxString ams_id = "Ext";//
             wxColour ams_col = wxColour(0xCE, 0xCE, 0xCE);
             it->second->item->set_ams_info(ams_col, ams_id);
         }
@@ -3035,14 +3035,17 @@ void SelectMachineDialog::update_ams_check(MachineObject *obj)
         if (obj->has_ams()) {
             m_checkbox_list["use_ams"]->Show();
             m_checkbox_list["use_ams"]->setValue("on");
+            change_materialitem_tip(false);
         }
         else {
             m_checkbox_list["use_ams"]->Hide();
             m_checkbox_list["use_ams"]->setValue("off");
+            change_materialitem_tip(true);
         }
     }else{
         m_checkbox_list["use_ams"]->Hide();
         m_checkbox_list["use_ams"]->setValue("on");
+        change_materialitem_tip(false);
     }
 }
 
@@ -3641,6 +3644,23 @@ void SelectMachineDialog::set_default()
     Fit();
 }
 
+void SelectMachineDialog::change_materialitem_tip(bool no_ams_only_ext)
+{
+    MaterialHash::iterator iter = m_materialList.begin();
+    while (iter != m_materialList.end()) {
+        int       id   = iter->first;
+        Material *item = iter->second;
+        if (item) {
+            if (no_ams_only_ext) {
+                item->item->SetToolTip(m_ams_tooltip_ext);
+            }
+            else {
+                item->item->SetToolTip(m_ams_tooltip);
+            }
+        }
+        iter++;
+    }
+}
 void SelectMachineDialog::reset_and_sync_ams_list()
 {
     // for black list
@@ -3688,7 +3708,8 @@ void SelectMachineDialog::reset_and_sync_ams_list()
     m_sizer_ams_mapping->Clear();
     m_materialList.clear();
     m_filaments.clear();
-
+    m_ams_tooltip =_L("Upper half area:  Original\nLower half area:  Filament in AMS\nAnd you can click it to modify");
+    m_ams_tooltip_ext = _L("Currently only External Spool is available, color mapping is prohibited, and control pop-up drop-down boxes are also prohibited.");
     const auto& full_config = wxGetApp().preset_bundle->full_config();
     size_t nozzle_nums = full_config.option<ConfigOptionFloatsNullable>("nozzle_diameter")->values.size();
 
@@ -3728,7 +3749,7 @@ void SelectMachineDialog::reset_and_sync_ams_list()
             item = new MaterialItem(m_filament_panel, colour_rgb, _L(display_materials[extruder]));
             m_sizer_ams_mapping->Add(item, 0, wxALL, FromDIP(5));
         }
-        item->SetToolTip(_L("Upper half area:  Original\nLower half area:  Filament in AMS\nAnd you can click it to modify"));
+        item->SetToolTip(m_ams_tooltip);
         item->Bind(wxEVT_LEFT_UP, [this, item, materials, extruder](wxMouseEvent &e) {});
         item->Bind(wxEVT_LEFT_DOWN, [this, item, materials, extruder](wxMouseEvent &e) {
             MaterialHash::iterator iter = m_materialList.begin();
diff --git a/src/slic3r/GUI/SelectMachine.hpp b/src/slic3r/GUI/SelectMachine.hpp
index 1128b984c..3fe724587 100644
--- a/src/slic3r/GUI/SelectMachine.hpp
+++ b/src/slic3r/GUI/SelectMachine.hpp
@@ -296,6 +296,8 @@ private:
 
     std::shared_ptr<int>                m_token = std::make_shared<int>(0);
     std::map<std::string, PrintOption*>   m_checkbox_list;
+    wxString                             m_ams_tooltip;
+    wxString                             m_ams_tooltip_ext;
     std::vector<wxString>               m_bedtype_list;
     std::vector<MachineObject*>         m_list;
     std::vector<FilamentInfo>           m_filaments;
@@ -447,6 +449,7 @@ public:
     void on_set_finish_mapping(wxCommandEvent& evt);
     void on_print_job_cancel(wxCommandEvent& evt);
     void set_default();
+    void change_materialitem_tip(bool no_ams_only_ext);
     void reset_and_sync_ams_list();
     void clone_thumbnail_data();
     void record_edge_pixels_data();
diff --git a/src/slic3r/GUI/SyncAmsInfoDialog.cpp b/src/slic3r/GUI/SyncAmsInfoDialog.cpp
index c82c42041..6cbbf07a8 100644
--- a/src/slic3r/GUI/SyncAmsInfoDialog.cpp
+++ b/src/slic3r/GUI/SyncAmsInfoDialog.cpp
@@ -146,7 +146,7 @@ void SyncAmsInfoDialog::update_ams_check(MachineObject *obj)
             m_checkbox_list["use_ams"]->setValue("on");
         } else {
             m_checkbox_list["use_ams"]->Hide();
-            m_checkbox_list["use_ams"]->setValue("off");
+            //m_checkbox_list["use_ams"]->setValue("off");
         }
     } else {
         m_checkbox_list["use_ams"]->Hide();
@@ -1065,7 +1065,7 @@ SyncAmsInfoDialog::SyncAmsInfoDialog(wxWindow *parent, SyncInfo &info) :
         sync_ams_mapping_result(m_ams_mapping_result);
     });
 
-    option_use_ams->setValue("off");
+    option_use_ams->setValue("on");
     m_sizer_options_timelapse->Add(option_timelapse, 0, wxEXPAND  | wxBOTTOM, FromDIP(5));
     m_sizer_options_other->Add(option_use_ams, 0, wxEXPAND  | wxBOTTOM, FromDIP(5));
     m_sizer_options_other->Add(option_auto_bed_level, 0, wxEXPAND  | wxBOTTOM, FromDIP(5));