diff --git a/src/libslic3r/GCode/WipeTower.cpp b/src/libslic3r/GCode/WipeTower.cpp
index 4bc2b87ac..4e55110e0 100644
--- a/src/libslic3r/GCode/WipeTower.cpp
+++ b/src/libslic3r/GCode/WipeTower.cpp
@@ -1470,7 +1470,7 @@ void WipeTower::set_extruder(size_t idx, const PrintConfig& config)
         m_filpar[idx].max_e_speed = (max_vol_speed / filament_area());
 
     m_perimeter_width = nozzle_diameter * Width_To_Nozzle_Ratio; // all extruders are now assumed to have the same diameter
-    m_nozzle_change_perimeter_width = 2 * m_perimeter_width;
+    m_nozzle_change_perimeter_width = m_perimeter_width;
     // BBS: remove useless config
 #if 0
     if (m_semm) {
@@ -2817,7 +2817,7 @@ WipeTower::NozzleChangeResult WipeTower::nozzle_change_new(int old_filament_id,
         if (i == nozzle_change_line_count - 1)
             break;
         if (writer.y() + dy - float(EPSILON) > cleaning_box.ru.y() - m_nozzle_change_perimeter_width) break;
-        writer.travel(writer.x(), writer.y() + dy, nozzle_change_speed);
+        writer.extrude(writer.x(), writer.y() + dy, nozzle_change_speed);
         m_left_to_right = !m_left_to_right;
     }
 
diff --git a/src/libslic3r/GCode/WipeTower.hpp b/src/libslic3r/GCode/WipeTower.hpp
index d8aa5478a..ca4c73a6c 100644
--- a/src/libslic3r/GCode/WipeTower.hpp
+++ b/src/libslic3r/GCode/WipeTower.hpp
@@ -456,7 +456,7 @@ private:
     Vec2f m_bed_bottom_left; // bottom-left corner coordinates (for rectangular beds)
 
 	float m_perimeter_width = 0.4f * Width_To_Nozzle_Ratio; // Width of an extrusion line, also a perimeter spacing for 100% infill.
-    float m_nozzle_change_perimeter_width = 2 * 0.4f * Width_To_Nozzle_Ratio;
+    float m_nozzle_change_perimeter_width = 0.4f * Width_To_Nozzle_Ratio;
 	float m_extrusion_flow = 0.038f; //0.029f;// Extrusion flow is derived from m_perimeter_width, layer height and filament diameter.
 
 	// Extruder specific parameters.