diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 2869f11c83..8b3b375131 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -150,9 +150,20 @@ void BackgroundSlicingProcess::process_fff()
 	    if (! m_export_path.empty()) {
 			wxQueueEvent(GUI::wxGetApp().mainframe->m_plater, new wxCommandEvent(m_event_export_began_id));
 			
+#if ENABLE_GCODE_WINDOW
+			// let the gcode window to unmap the temporary .gcode file (m_temp_output_path)
+			// because the scripts may want to modify it
+			GUI::wxGetApp().plater()->stop_mapping_gcode_window();
+#endif // ENABLE_GCODE_WINDOW
+
 			m_print->set_status(95, _utf8(L("Running post-processing scripts")));
 			run_post_process_scripts(m_temp_output_path, m_fff_print->full_print_config());
-			
+
+#if ENABLE_GCODE_WINDOW
+			// let the gcode window to reload and remap the temporary .gcode file (m_temp_output_path)
+			GUI::wxGetApp().plater()->start_mapping_gcode_window();
+#endif // ENABLE_GCODE_WINDOW
+
 			//FIXME localize the messages
 			// Perform the final post-processing of the export path by applying the print statistics over the file name.
 			std::string export_path = m_fff_print->print_statistics().finalize_output_path(m_export_path);
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 2ced8e6015..b18a9a0e08 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -280,6 +280,9 @@ void GCodeViewer::SequentialView::GCodeWindow::load_gcode()
     if (m_filename.empty())
         return;
 
+    if (m_file.is_open())
+        return;
+
     try
     {
         // generate mapping for accessing data in file by line number
@@ -1124,6 +1127,18 @@ void GCodeViewer::export_toolpaths_to_obj(const char* filename) const
     fclose(fp);
 }
 
+#if ENABLE_GCODE_WINDOW
+void GCodeViewer::start_mapping_gcode_window()
+{
+    m_sequential_view.gcode_window.load_gcode();
+}
+
+void GCodeViewer::stop_mapping_gcode_window()
+{
+    m_sequential_view.gcode_window.stop_mapping_file();
+}
+#endif // ENABLE_GCODE_WINDOW
+
 void GCodeViewer::load_toolpaths(const GCodeProcessor::Result& gcode_result)
 {
     // max index buffer size, in bytes
diff --git a/src/slic3r/GUI/GCodeViewer.hpp b/src/slic3r/GUI/GCodeViewer.hpp
index d5c793e62c..bfdbfa12f6 100644
--- a/src/slic3r/GUI/GCodeViewer.hpp
+++ b/src/slic3r/GUI/GCodeViewer.hpp
@@ -561,7 +561,6 @@ public:
 
             void render(float top, float bottom, uint64_t curr_line_id) const;
 
-        private:
             void stop_mapping_file();
         };
 #endif // ENABLE_GCODE_WINDOW
@@ -681,6 +680,8 @@ public:
     void export_toolpaths_to_obj(const char* filename) const;
 
 #if ENABLE_GCODE_WINDOW
+    void start_mapping_gcode_window();
+    void stop_mapping_gcode_window();
     void toggle_gcode_window_visibility() { m_sequential_view.gcode_window.toggle_visibility(); }
 #endif // ENABLE_GCODE_WINDOW
 
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 88a3bf6fa0..e8e4caed90 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1124,6 +1124,18 @@ int GLCanvas3D::check_volumes_outside_state() const
     return (int)state;
 }
 
+#if ENABLE_GCODE_WINDOW
+void GLCanvas3D::start_mapping_gcode_window()
+{
+    m_gcode_viewer.start_mapping_gcode_window();
+}
+
+void GLCanvas3D::stop_mapping_gcode_window()
+{
+    m_gcode_viewer.stop_mapping_gcode_window();
+}
+#endif // ENABLE_GCODE_WINDOW
+
 void GLCanvas3D::toggle_sla_auxiliaries_visibility(bool visible, const ModelObject* mo, int instance_idx)
 {
     m_render_sla_auxiliaries = visible;
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index e684281344..94630b0f74 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -547,6 +547,11 @@ public:
     const GCodeViewer::SequentialView& get_gcode_sequential_view() const { return m_gcode_viewer.get_sequential_view(); }
     void update_gcode_sequential_view_current(unsigned int first, unsigned int last) { m_gcode_viewer.update_sequential_view_current(first, last); }
 
+#if ENABLE_GCODE_WINDOW
+    void start_mapping_gcode_window();
+    void stop_mapping_gcode_window();
+#endif // ENABLE_GCODE_WINDOW
+
     void toggle_sla_auxiliaries_visibility(bool visible, const ModelObject* mo = nullptr, int instance_idx = -1);
     void toggle_model_objects_visibility(bool visible, const ModelObject* mo = nullptr, int instance_idx = -1);
     void update_instance_printable_state_for_object(size_t obj_idx);
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index c09dc512cc..ca87e244b5 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -5946,6 +5946,18 @@ BoundingBoxf Plater::bed_shape_bb() const
     return p->bed_shape_bb();
 }
 
+#if ENABLE_GCODE_WINDOW
+void Plater::start_mapping_gcode_window()
+{
+    p->preview->get_canvas3d()->start_mapping_gcode_window();
+}
+
+void Plater::stop_mapping_gcode_window()
+{
+    p->preview->get_canvas3d()->stop_mapping_gcode_window();
+}
+#endif // ENABLE_GCODE_WINDOW
+
 void Plater::arrange()
 {
     p->m_ui_jobs.arrange();
diff --git a/src/slic3r/GUI/Plater.hpp b/src/slic3r/GUI/Plater.hpp
index e6a5160f32..9fc424e830 100644
--- a/src/slic3r/GUI/Plater.hpp
+++ b/src/slic3r/GUI/Plater.hpp
@@ -276,6 +276,11 @@ public:
     GLCanvas3D* get_current_canvas3D();
     BoundingBoxf bed_shape_bb() const;
     
+#if ENABLE_GCODE_WINDOW
+    void start_mapping_gcode_window();
+    void stop_mapping_gcode_window();
+#endif // ENABLE_GCODE_WINDOW
+
     void arrange();
     void find_new_position(const ModelInstancePtrs  &instances);