diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index faf37c8ec9..98377dbc4d 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -1646,12 +1646,11 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
         m_config.inner_wall_speed = print.default_region_config().inner_wall_speed;
         calib_pressure_advance pa_test(this);
         if(print.is_calib_mode() == Calib_PA_DDE)
-            gcode = pa_test.generate_test();
+            gcode += pa_test.generate_test();
         else
-            gcode = pa_test.generate_test(0.0,0.02);
+            gcode +=pa_test.generate_test(0.0,0.02);
 
         file.write(gcode);
-        print.is_calib_mode() = Calib_None;
     }
     else {
         //BBS: open spaghetti detector
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index df0e3b7db3..bc809dba9c 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -7872,13 +7872,7 @@ void Plater::calib_pa(bool bowden) {
     wxGetApp().mainframe->select_tab(size_t(MainFrame::tp3DEditor));
 
     p->background_process.fff_print()->is_calib_mode() = bowden ? Calib_PA_Bowden : Calib_PA_DDE;
-    //BBS update extruder params and speed table before slicing
-    Plater::setExtruderParams(Slic3r::Model::extruderParamsMap);
-    Plater::setPrintSpeedTable(Slic3r::Model::printSpeedMap);
-    p->m_slice_all = false;
-    reslice();
-    wxGetApp().mainframe->select_tab(size_t(MainFrame::tpPreview));
-    //select_view_3D("Preview");
+
 }
 
 void Plater::import_sl1_archive()