diff --git a/src/libslic3r/GCode/WipeTower.cpp b/src/libslic3r/GCode/WipeTower.cpp
index 1a4cfe8388..0af13d5552 100644
--- a/src/libslic3r/GCode/WipeTower.cpp
+++ b/src/libslic3r/GCode/WipeTower.cpp
@@ -62,7 +62,7 @@ static bool is_valid_gcode(const std::string &gcode)
     return is_valid;
 }
 
-Polygon chamfer_polygon(Polygon &polygon, double chamfer_dis = 2., double angle_tol = 30. / 180. * PI)
+static Polygon chamfer_polygon(Polygon &polygon, double chamfer_dis = 2., double angle_tol = 30. / 180. * PI)
 {
     if (polygon.points.size() < 3) return polygon;
     Polygon res;
@@ -96,7 +96,7 @@ Polygon chamfer_polygon(Polygon &polygon, double chamfer_dis = 2., double angle_
     return res;
 }
 
-Polygon rounding_polygon(Polygon &polygon, double rounding = 2., double angle_tol = 30. / 180. * PI)
+static Polygon rounding_polygon(Polygon &polygon, double rounding = 2., double angle_tol = 30. / 180. * PI)
 {
     if (polygon.points.size() < 3) return polygon;
     Polygon res;
@@ -164,7 +164,7 @@ Polygon rounding_polygon(Polygon &polygon, double rounding = 2., double angle_to
     return res;
 }
 
-Polygon rounding_rectangle(Polygon &polygon, double rounding = 2., double angle_tol = 30. / 180. * PI) {
+static Polygon rounding_rectangle(Polygon &polygon, double rounding = 2., double angle_tol = 30. / 180. * PI) {
     if (polygon.points.size() < 3) return polygon;
     Polygon res;
     res.points.reserve(polygon.points.size() * 2);
@@ -222,7 +222,7 @@ Polygon rounding_rectangle(Polygon &polygon, double rounding = 2., double angle_
     return res;
 }
 
-std::pair<bool, Vec2f> ray_intersetion_line(const Vec2f &a, const Vec2f &v1, const Vec2f &b, const Vec2f &c)
+static std::pair<bool, Vec2f> ray_intersetion_line(const Vec2f &a, const Vec2f &v1, const Vec2f &b, const Vec2f &c)
 {
     const Vec2f v2    = c - b;
     double      denom = cross2(v1, v2);
@@ -239,19 +239,19 @@ std::pair<bool, Vec2f> ray_intersetion_line(const Vec2f &a, const Vec2f &v1, con
     }
     return std::pair<bool, Vec2f>(false, Vec2f{0, 0});
 }
-Polygon scale_polygon(const std::vector<Vec2f> &points) {
+static Polygon scale_polygon(const std::vector<Vec2f> &points) {
     Polygon res;
     for (const auto &p : points) res.points.push_back(scaled(p));
     return res;
 }
-std::vector<Vec2f> unscale_polygon(const Polygon& polygon)
+static std::vector<Vec2f> unscale_polygon(const Polygon& polygon)
 {
     std::vector<Vec2f> res;
     for (const auto &p : polygon.points) res.push_back(unscaled<float>(p));
     return res;
 }
 
-Polygon generate_rectange(const Line &line, coord_t offset)
+static Polygon generate_rectange(const Line &line, coord_t offset)
 {
     Point p1 = line.a;
     Point p2 = line.b;
@@ -329,7 +329,7 @@ struct PointWithFlag
     int   pair_idx; // gap_pair idx
     bool  is_forward;
 };
-IntersectionInfo move_point_along_polygon(const std::vector<Vec2f> &points, const Vec2f &startPoint, int startIdx, float offset, bool forward, int pair_idx)
+static IntersectionInfo move_point_along_polygon(const std::vector<Vec2f> &points, const Vec2f &startPoint, int startIdx, float offset, bool forward, int pair_idx)
 {
     float            remainingDistance = offset;
     IntersectionInfo res;
@@ -391,7 +391,7 @@ IntersectionInfo move_point_along_polygon(const std::vector<Vec2f> &points, cons
     return res;
 };
 
-void insert_points(std::vector<PointWithFlag> &pl, int idx, Vec2f pos, int pair_idx, bool is_forward)
+static void insert_points(std::vector<PointWithFlag> &pl, int idx, Vec2f pos, int pair_idx, bool is_forward)
 {
     int   next = (idx + 1) % pl.size();
     Vec2f pos1 = pl[idx].pos;
@@ -407,7 +407,7 @@ void insert_points(std::vector<PointWithFlag> &pl, int idx, Vec2f pos, int pair_
     }
 }
 
-Polylines remove_points_from_polygon(const Polygon &polygon, const std::vector<Vec2f> &skip_points, double range, bool is_left ,Polygon& insert_skip_pg)
+static Polylines remove_points_from_polygon(const Polygon &polygon, const std::vector<Vec2f> &skip_points, double range, bool is_left ,Polygon& insert_skip_pg)
 {
     Polylines result;
     std::vector<PointWithFlag> new_pl; // add intersection points for gaps, where bool indicates whether it's a gap point.
@@ -500,7 +500,7 @@ Polylines remove_points_from_polygon(const Polygon &polygon, const std::vector<V
     return result;
 }
 
-Polylines contrust_gap_for_skip_points(const Polygon &polygon, const std::vector<Vec2f> & skip_points ,float wt_width,float gap_length,Polygon& insert_skip_polygon)
+static Polylines contrust_gap_for_skip_points(const Polygon &polygon, const std::vector<Vec2f> & skip_points ,float wt_width,float gap_length,Polygon& insert_skip_polygon)
 {
     if (skip_points.empty()) {
         insert_skip_polygon = polygon;
@@ -515,7 +515,7 @@ Polylines contrust_gap_for_skip_points(const Polygon &polygon, const std::vector
 
 };
 
-Polygon generate_rectange_polygon(const Vec2f &wt_box_min ,const Vec2f & wt_box_max) {
+static Polygon generate_rectange_polygon(const Vec2f &wt_box_min ,const Vec2f & wt_box_max) {
     Polygon res;
     res.points.push_back(scaled(wt_box_min));
     res.points.push_back(scaled(Vec2f{wt_box_max[0], wt_box_min[1]}));
diff --git a/src/libslic3r/GCode/WipeTower2.cpp b/src/libslic3r/GCode/WipeTower2.cpp
index 49a60e010c..3e27ea6bd5 100644
--- a/src/libslic3r/GCode/WipeTower2.cpp
+++ b/src/libslic3r/GCode/WipeTower2.cpp
@@ -69,7 +69,7 @@ static bool is_valid_gcode(const std::string& gcode)
     return is_valid;
 }
 
-Polygon chamfer_polygon(Polygon& polygon, double chamfer_dis = 2., double angle_tol = 30. / 180. * PI)
+static Polygon chamfer_polygon(Polygon& polygon, double chamfer_dis = 2., double angle_tol = 30. / 180. * PI)
 {
     if (polygon.points.size() < 3)
         return polygon;
@@ -104,7 +104,7 @@ Polygon chamfer_polygon(Polygon& polygon, double chamfer_dis = 2., double angle_
     return res;
 }
 
-Polygon rounding_polygon(Polygon& polygon, double rounding = 2., double angle_tol  = 30. / 180. * PI)
+static Polygon rounding_polygon(Polygon& polygon, double rounding = 2., double angle_tol  = 30. / 180. * PI)
 {
     if (polygon.points.size() < 3)
         return polygon;
@@ -174,7 +174,7 @@ Polygon rounding_polygon(Polygon& polygon, double rounding = 2., double angle_to
     return res;
 }
 
-Polygon rounding_rectangle(Polygon& polygon, double rounding = 2., double angle_tol = 30. / 180. * PI)
+static Polygon rounding_rectangle(Polygon& polygon, double rounding = 2., double angle_tol = 30. / 180. * PI)
 {
     if (polygon.points.size() < 3)
         return polygon;
@@ -234,7 +234,7 @@ Polygon rounding_rectangle(Polygon& polygon, double rounding = 2., double angle_
     return res;
 }
 
-std::pair<bool, Vec2f> ray_intersetion_line(const Vec2f& a, const Vec2f& v1, const Vec2f& b, const Vec2f& c)
+static std::pair<bool, Vec2f> ray_intersetion_line(const Vec2f& a, const Vec2f& v1, const Vec2f& b, const Vec2f& c)
 {
     const Vec2f v2    = c - b;
     double      denom = cross2(v1, v2);
@@ -252,14 +252,14 @@ std::pair<bool, Vec2f> ray_intersetion_line(const Vec2f& a, const Vec2f& v1, con
     }
     return std::pair<bool, Vec2f>(false, Vec2f{0, 0});
 }
-Polygon scale_polygon(const std::vector<Vec2f>& points)
+static Polygon scale_polygon(const std::vector<Vec2f>& points)
 {
     Polygon res;
     for (const auto& p : points)
         res.points.push_back(scaled(p));
     return res;
 }
-std::vector<Vec2f> unscale_polygon(const Polygon& polygon)
+static std::vector<Vec2f> unscale_polygon(const Polygon& polygon)
 {
     std::vector<Vec2f> res;
     for (const auto& p : polygon.points)
@@ -267,7 +267,7 @@ std::vector<Vec2f> unscale_polygon(const Polygon& polygon)
     return res;
 }
 
-Polygon generate_rectange(const Line& line, coord_t offset)
+static Polygon generate_rectange(const Line& line, coord_t offset)
 {
     Point p1 = line.a;
     Point p2 = line.b;
@@ -349,7 +349,7 @@ struct PointWithFlag
     int   pair_idx; // gap_pair idx
     bool  is_forward;
 };
-IntersectionInfo move_point_along_polygon(
+static IntersectionInfo move_point_along_polygon(
     const std::vector<Vec2f>& points, const Vec2f& startPoint, int startIdx, float offset, bool forward, int pair_idx)
 {
     float            remainingDistance = offset;
@@ -412,7 +412,7 @@ IntersectionInfo move_point_along_polygon(
     return res;
 };
 
-void insert_points(std::vector<PointWithFlag>& pl, int idx, Vec2f pos, int pair_idx, bool is_forward)
+static void insert_points(std::vector<PointWithFlag>& pl, int idx, Vec2f pos, int pair_idx, bool is_forward)
 {
     int   next = (idx + 1) % pl.size();
     Vec2f pos1 = pl[idx].pos;
@@ -428,7 +428,7 @@ void insert_points(std::vector<PointWithFlag>& pl, int idx, Vec2f pos, int pair_
     }
 }
 
-Polylines remove_points_from_polygon(
+static Polylines remove_points_from_polygon(
     const Polygon& polygon, const std::vector<Vec2f>& skip_points, double range, bool is_left, Polygon& insert_skip_pg)
 {
     assert(polygon.size() > 2);
@@ -519,7 +519,7 @@ Polylines remove_points_from_polygon(
     return result;
 }
 
-Polylines contrust_gap_for_skip_points(
+static Polylines contrust_gap_for_skip_points(
     const Polygon& polygon, const std::vector<Vec2f>& skip_points, float wt_width, float gap_length, Polygon& insert_skip_polygon)
 {
     if (skip_points.empty()) {
@@ -534,7 +534,7 @@ Polylines contrust_gap_for_skip_points(
     return remove_points_from_polygon(polygon, skip_points, gap_length, is_left, insert_skip_polygon);
 };
 
-Polygon generate_rectange_polygon(const Vec2f& wt_box_min, const Vec2f& wt_box_max)
+static Polygon generate_rectange_polygon(const Vec2f& wt_box_min, const Vec2f& wt_box_max)
 {
     Polygon res;
     res.points.push_back(scaled(wt_box_min));
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 4ec52d2f68..9c71f4241a 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -2873,7 +2873,7 @@ void GLCanvas3D::reload_scene(bool refresh_immediately, bool force_full_scene_re
                 float a = dynamic_cast<const ConfigOptionFloat*>(proj_cfg.option("wipe_tower_rotation_angle"))->value;
                 float tower_brim_width = dynamic_cast<const ConfigOptionFloat*>(m_config->option("prime_tower_brim_width"))->value;
                 // BBS
-                // float v = dynamic_cast<const ConfigOptionFloat*>(m_config->option("prime_volume"))->value;
+                float v = dynamic_cast<const ConfigOptionFloat*>(m_config->option("prime_volume"))->value;
                 Vec3d plate_origin = ppl.get_plate(plate_id)->get_origin();
 
                 const Print* print = m_process->fff_print();
diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index 578f517884..d875be8ac6 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -1821,7 +1821,7 @@ Vec3d PartPlate::calculate_wipe_tower_size(const DynamicPrintConfig &config, con
         if (!use_global_objects && !contain_instance_totally(obj_idx, 0))
             continue;
 
-        BoundingBoxf3 bbox = m_model->objects[obj_idx]->bounding_box();
+        BoundingBoxf3 bbox = m_model->objects[obj_idx]->bounding_box_exact();
         max_height         = std::max(bbox.size().z(), max_height);
     }
     wipe_tower_size(2) = max_height;