diff --git a/src/libslic3r/ExtrusionEntity.cpp b/src/libslic3r/ExtrusionEntity.cpp
index 69a856d47..1a771da44 100644
--- a/src/libslic3r/ExtrusionEntity.cpp
+++ b/src/libslic3r/ExtrusionEntity.cpp
@@ -14,6 +14,7 @@
 namespace Slic3r {
 static const double slope_path_ratio = 0.3;
 static const double slope_inner_outer_wall_gap = 0.4;
+static const int    overhang_threshold = 1;
 
 void ExtrusionPath::intersect_expolygons(const ExPolygons &collection, ExtrusionEntityCollection* retval) const
 {
@@ -418,6 +419,17 @@ bool ExtrusionLoop::has_overhang_point(const Point &point) const
     return false;
 }
 
+bool ExtrusionLoop::has_overhang_paths() const
+{
+    for (const ExtrusionPath &path : this->paths) {
+        if (is_bridge(path.role()))
+            return true;
+        if (path.overhang_degree >= overhang_threshold)
+            return true;
+    }
+    return false;
+}
+
 void ExtrusionLoop::polygons_covered_by_width(Polygons &out, const float scaled_epsilon) const
 {
     for (const ExtrusionPath &path : this->paths)
diff --git a/src/libslic3r/ExtrusionEntity.hpp b/src/libslic3r/ExtrusionEntity.hpp
index 4d4fcf475..2d8039da4 100644
--- a/src/libslic3r/ExtrusionEntity.hpp
+++ b/src/libslic3r/ExtrusionEntity.hpp
@@ -66,6 +66,11 @@ enum ExtrusionRole : uint8_t {
     erCount
 };
 
+enum CustomizeFlag : uint8_t {
+    cfNone,
+    cfCircleCompensation   // shaft hole tolerance compensation
+};
+
 // Special flags describing loop
 enum ExtrusionLoopRole {
     elrDefault                     = 1 << 0,
@@ -119,6 +124,12 @@ inline bool is_bridge(ExtrusionRole role) {
 class ExtrusionEntity
 {
 public:
+    ExtrusionEntity() = default;
+    ExtrusionEntity(const ExtrusionEntity &rhs) { m_customize_flag = rhs.m_customize_flag; };
+    ExtrusionEntity(ExtrusionEntity &&rhs) { m_customize_flag = rhs.m_customize_flag; };
+    ExtrusionEntity &operator=(const ExtrusionEntity &rhs) { m_customize_flag = rhs.m_customize_flag; return *this; }
+    ExtrusionEntity &operator=(ExtrusionEntity &&rhs) { m_customize_flag = rhs.m_customize_flag;  return *this; }
+
     virtual ExtrusionRole role() const = 0;
     virtual bool is_collection() const { return false; }
     virtual bool is_loop() const { return false; }
@@ -154,6 +165,12 @@ public:
 
     static std::string role_to_string(ExtrusionRole role);
     static ExtrusionRole string_to_role(const std::string_view role);
+
+    virtual CustomizeFlag get_customize_flag() const { return m_customize_flag; };
+    virtual void set_customize_flag(CustomizeFlag flag) { m_customize_flag = flag; };
+
+protected:
+    CustomizeFlag m_customize_flag{CustomizeFlag::cfNone};
 };
 
 typedef std::vector<ExtrusionEntity*> ExtrusionEntitiesPtr;
@@ -178,7 +195,8 @@ public:
     ExtrusionPath(double overhang_degree, int curve_degree, ExtrusionRole role, double mm3_per_mm, float width, float height) : overhang_degree(overhang_degree), curve_degree(curve_degree), mm3_per_mm(mm3_per_mm), width(width), height(height), m_role(role) {}
 
     ExtrusionPath(const ExtrusionPath &rhs)
-        : polyline(rhs.polyline)
+        : ExtrusionEntity(rhs)
+        , polyline(rhs.polyline)
         , overhang_degree(rhs.overhang_degree)
         , curve_degree(rhs.curve_degree)
         , mm3_per_mm(rhs.mm3_per_mm)
@@ -190,7 +208,8 @@ public:
         , m_no_extrusion(rhs.m_no_extrusion)
     {}
     ExtrusionPath(ExtrusionPath &&rhs)
-        : polyline(std::move(rhs.polyline))
+        : ExtrusionEntity(rhs)
+        , polyline(std::move(rhs.polyline))
         , overhang_degree(rhs.overhang_degree)
         , curve_degree(rhs.curve_degree)
         , mm3_per_mm(rhs.mm3_per_mm)
@@ -202,7 +221,8 @@ public:
         , m_no_extrusion(rhs.m_no_extrusion)
     {}
     ExtrusionPath(const Polyline &polyline, const ExtrusionPath &rhs)
-        : polyline(polyline)
+        : ExtrusionEntity(rhs)
+        , polyline(polyline)
         , overhang_degree(rhs.overhang_degree)
         , curve_degree(rhs.curve_degree)
         , mm3_per_mm(rhs.mm3_per_mm)
@@ -214,7 +234,8 @@ public:
         , m_no_extrusion(rhs.m_no_extrusion)
     {}
     ExtrusionPath(Polyline &&polyline, const ExtrusionPath &rhs)
-        : polyline(std::move(polyline))
+        : ExtrusionEntity(rhs)
+        , polyline(std::move(polyline))
         , overhang_degree(rhs.overhang_degree)
         , curve_degree(rhs.curve_degree)
         , mm3_per_mm(rhs.mm3_per_mm)
@@ -227,6 +248,7 @@ public:
     {}
 
     ExtrusionPath& operator=(const ExtrusionPath& rhs) {
+        ExtrusionEntity::operator=(rhs);
         m_can_reverse = rhs.m_can_reverse;
         m_role = rhs.m_role;
         m_no_extrusion = rhs.m_no_extrusion;
@@ -240,6 +262,7 @@ public:
         return *this;
     }
     ExtrusionPath& operator=(ExtrusionPath&& rhs) {
+        ExtrusionEntity::operator=(rhs);
         m_can_reverse = rhs.m_can_reverse;
         m_role = rhs.m_role;
         m_no_extrusion = rhs.m_no_extrusion;
@@ -441,6 +464,7 @@ public:
     ExtrusionLoop(ExtrusionLoopRole role = elrDefault) : m_loop_role(role) {}
     ExtrusionLoop(const ExtrusionPaths &paths, ExtrusionLoopRole role = elrDefault) : paths(paths), m_loop_role(role) {}
     ExtrusionLoop(ExtrusionPaths &&paths, ExtrusionLoopRole role = elrDefault) : paths(std::move(paths)), m_loop_role(role) {}
+    ExtrusionLoop(ExtrusionPaths &&paths, ExtrusionLoopRole role, CustomizeFlag flag) : paths(std::move(paths)), m_loop_role(role) { m_customize_flag = flag; }
     ExtrusionLoop(const ExtrusionPath &path, ExtrusionLoopRole role = elrDefault) : m_loop_role(role)
         { this->paths.push_back(path); }
     ExtrusionLoop(const ExtrusionPath &&path, ExtrusionLoopRole role = elrDefault) : m_loop_role(role)
@@ -472,6 +496,7 @@ public:
     // Test, whether the point is extruded by a bridging flow.
     // This used to be used to avoid placing seams on overhangs, but now the EdgeGrid is used instead.
     bool has_overhang_point(const Point &point) const;
+    bool has_overhang_paths() const;
     ExtrusionRole role() const override { return this->paths.empty() ? erNone : this->paths.front().role(); }
     ExtrusionLoopRole loop_role() const { return m_loop_role; }
     void set_loop_role(ExtrusionLoopRole role) {    m_loop_role = role; }
diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index e88f8f8a6..d75366ae6 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -4388,6 +4388,7 @@ std::string GCode::extrude_loop(ExtrusionLoop loop, std::string description, dou
     const double clip_length = m_enable_loop_clipping && !enable_seam_slope ? seam_gap : 0;
      // get paths
     ExtrusionPaths paths;
+    bool set_holes_and_compensation_speed = loop.get_customize_flag() && !loop.has_overhang_paths();
     loop.clip_end(clip_length, &paths);
     if (paths.empty()) return "";
 
@@ -4449,7 +4450,7 @@ std::string GCode::extrude_loop(ExtrusionLoop loop, std::string description, dou
                 smooth_speed_discontinuity_area(new_loop.paths);
             // Then extrude it
             for (const auto &p : new_loop.get_all_paths()) {
-                gcode += this->_extrude(*p, description, speed_for_path(*p));
+                gcode += this->_extrude(*p, description, speed_for_path(*p), set_holes_and_compensation_speed);
             }
             set_last_scarf_seam_flag(true);
 
@@ -4474,7 +4475,7 @@ std::string GCode::extrude_loop(ExtrusionLoop loop, std::string description, dou
             smooth_speed_discontinuity_area(paths);
 
         for (ExtrusionPaths::iterator path = paths.begin(); path != paths.end(); ++path) {
-            gcode += this->_extrude(*path, description, speed_for_path(*path));
+            gcode += this->_extrude(*path, description, speed_for_path(*path), set_holes_and_compensation_speed);
         }
         set_last_scarf_seam_flag(false);
     }
@@ -5006,7 +5007,7 @@ void GCode::smooth_speed_discontinuity_area(ExtrusionPaths &paths) {
     paths = std::move(inter_paths);
 }
 
-std::string GCode::_extrude(const ExtrusionPath &path, std::string description, double speed, bool is_first_slope)
+std::string GCode::_extrude(const ExtrusionPath &path, std::string description, double speed, bool set_holes_and_compensation_speed, bool is_first_slope)
 {
     std::string gcode;
 
@@ -5099,7 +5100,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
     if (speed == -1) {
         if (path.role() == erPerimeter) {
             speed = m_config.inner_wall_speed.get_at(cur_extruder_index());
-            if (m_config.detect_overhang_wall && m_config.smooth_speed_discontinuity_area && path.smooth_speed != 0)
+            //reset speed by auto compensation speed
+            if(set_holes_and_compensation_speed) {
+                speed = m_config.circle_compensation_speed;
+            }else if (m_config.detect_overhang_wall && m_config.smooth_speed_discontinuity_area && path.smooth_speed != 0)
                 speed = path.smooth_speed;
             else if (m_config.enable_overhang_speed.get_at(cur_extruder_index())) {
                 double new_speed = 0;
@@ -5108,12 +5112,14 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
             }
         } else if (path.role() == erExternalPerimeter) {
             speed = m_config.outer_wall_speed.get_at(cur_extruder_index());
-            if (m_config.detect_overhang_wall && m_config.smooth_speed_discontinuity_area && path.smooth_speed != 0)
+            // reset speed by auto compensation speed
+            if (set_holes_and_compensation_speed) {
+                speed = m_config.circle_compensation_speed;
+            } else if (m_config.detect_overhang_wall && m_config.smooth_speed_discontinuity_area && path.smooth_speed != 0)
                 speed = path.smooth_speed;
             else if (m_config.enable_overhang_speed.get_at(cur_extruder_index())) {
                 double new_speed = 0;
-                new_speed = get_overhang_degree_corr_speed(speed, path.overhang_degree);
-
+                new_speed        = get_overhang_degree_corr_speed(speed, path.overhang_degree);
                 speed = new_speed == 0.0 ? speed : new_speed;
             }
         } else if (path.role() == erOverhangPerimeter && path.overhang_degree == 5) {
@@ -5198,6 +5204,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
     char buf[64];
     assert(is_decimal_separator_point());
 
+
+    if (set_holes_and_compensation_speed)
+        gcode += "; Slow Down Start\n";
+
     if (path.role() != m_last_processor_extrusion_role) {
         m_last_processor_extrusion_role = path.role();
         sprintf(buf, ";%s%s\n", GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Role).c_str(), ExtrusionEntity::role_to_string(m_last_processor_extrusion_role).c_str());
@@ -5349,6 +5359,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
         }
     }
 
+    if (set_holes_and_compensation_speed) {
+        gcode += "; Slow Down End\n";
+    }
+
     this->set_last_pos(path.last_point());
     return gcode;
 }
diff --git a/src/libslic3r/GCode.hpp b/src/libslic3r/GCode.hpp
index 7ce7ed95f..b98fc42ce 100644
--- a/src/libslic3r/GCode.hpp
+++ b/src/libslic3r/GCode.hpp
@@ -560,7 +560,7 @@ private:
     // BBS
     int get_bed_temperature(const int extruder_id, const bool is_first_layer, const BedType bed_type) const;
 
-    std::string _extrude(const ExtrusionPath &path, std::string description = "", double speed = -1, bool is_first_slope = false);
+    std::string _extrude(const ExtrusionPath &path, std::string description = "", double speed = -1, bool set_holes_and_compensation_speed = false, bool is_first_slope = false);
     ExtrusionPaths set_speed_transition(ExtrusionPaths &paths);
     ExtrusionPaths split_and_mapping_speed(double &other_path_v, double &final_v, ExtrusionPath &this_path, double max_smooth_length, bool split_from_left = true);
     double get_path_speed(const ExtrusionPath &path);
diff --git a/src/libslic3r/GCode/GCodeEditer.cpp b/src/libslic3r/GCode/GCodeEditer.cpp
index 50ba2d7ce..5c0905fea 100644
--- a/src/libslic3r/GCode/GCodeEditer.cpp
+++ b/src/libslic3r/GCode/GCodeEditer.cpp
@@ -128,7 +128,7 @@ std::vector<PerExtruderAdjustments> GCodeEditer::parse_layer_gcode(
     std::string cooling_node_label = "; COOLING_NODE: ";
     bool append_wall_ptr = false;
     bool append_inner_wall_ptr = false;
-
+    bool not_join_cooling = false;
     std::pair<int, int> node_pos;
     int line_idx = -1;
     for (; *line_start != 0; line_start = line_end)
@@ -199,7 +199,7 @@ std::vector<PerExtruderAdjustments> GCodeEditer::parse_layer_gcode(
 
             if (wipe)
                 line.type |= CoolingLine::TYPE_WIPE;
-            if (boost::contains(sline, ";_EXTRUDE_SET_SPEED") && ! wipe) {
+            if (boost::contains(sline, ";_EXTRUDE_SET_SPEED") && !wipe && !not_join_cooling) {
                 line.type |= CoolingLine::TYPE_ADJUSTABLE;
                 active_speed_modifier = adjustment->lines.size();
             }
@@ -279,6 +279,10 @@ std::vector<PerExtruderAdjustments> GCodeEditer::parse_layer_gcode(
                 }
             }
             current_pos = std::move(new_pos);
+        } else if (boost::starts_with(sline, "; Slow Down Start")) {
+            not_join_cooling = true;
+        } else if (boost::starts_with(sline, "; Slow Down End")) {
+            not_join_cooling = false;
         } else if (boost::starts_with(sline, ";_EXTRUDE_END")) {
             line.type = CoolingLine::TYPE_EXTRUDE_END;
             active_speed_modifier = size_t(-1);
diff --git a/src/libslic3r/Layer.cpp b/src/libslic3r/Layer.cpp
index a9dbf7371..761614831 100644
--- a/src/libslic3r/Layer.cpp
+++ b/src/libslic3r/Layer.cpp
@@ -197,7 +197,13 @@ void Layer::make_perimeters()
 
 	        if (layerms.size() == 1) {  // optimization
 	            (*layerm)->fill_surfaces.surfaces.clear();
-	            (*layerm)->make_perimeters((*layerm)->slices, &(*layerm)->fill_surfaces, &(*layerm)->fill_no_overlap_expolygons, this->loop_nodes);
+                if (this->object()->config().enable_circle_compensation) {
+                    SurfaceCollection copy_slices = (*layerm)->slices;
+                    (*layerm)->auto_circle_compensation(copy_slices);
+                    (*layerm)->make_perimeters(copy_slices, &(*layerm)->fill_surfaces, &(*layerm)->fill_no_overlap_expolygons, this->loop_nodes);
+                } else
+                    (*layerm)->make_perimeters((*layerm)->slices, &(*layerm)->fill_surfaces, &(*layerm)->fill_no_overlap_expolygons, this->loop_nodes);
+
 	            (*layerm)->fill_expolygons = to_expolygons((*layerm)->fill_surfaces.surfaces);
 	        } else {
 	            SurfaceCollection new_slices;
@@ -221,6 +227,8 @@ void Layer::make_perimeters()
 	            SurfaceCollection fill_surfaces;
                 //BBS
                 ExPolygons fill_no_overlap;
+                if (this->object()->config().enable_circle_compensation)
+                    layerm_config->auto_circle_compensation(new_slices);
                 layerm_config->make_perimeters(new_slices, &fill_surfaces, &fill_no_overlap, this->loop_nodes);
 
 	            // assign fill_surfaces to each layer
diff --git a/src/libslic3r/Layer.hpp b/src/libslic3r/Layer.hpp
index c0be3b110..50d030e18 100644
--- a/src/libslic3r/Layer.hpp
+++ b/src/libslic3r/Layer.hpp
@@ -80,6 +80,7 @@ public:
     void    slices_to_fill_surfaces_clipped();
     void    prepare_fill_surfaces();
     //BBS
+    void    auto_circle_compensation(SurfaceCollection &slices);
     void    make_perimeters(const SurfaceCollection &slices, SurfaceCollection* fill_surfaces, ExPolygons* fill_no_overlap, std::vector<LoopNode> &loop_nodes);
     void    process_external_surfaces(const Layer *lower_layer, const Polygons *lower_layer_covered);
     double  infill_area_threshold() const;
diff --git a/src/libslic3r/LayerRegion.cpp b/src/libslic3r/LayerRegion.cpp
index 6eb0aa32e..3a1f5a632 100644
--- a/src/libslic3r/LayerRegion.cpp
+++ b/src/libslic3r/LayerRegion.cpp
@@ -47,7 +47,7 @@ Flow LayerRegion::bridging_flow(FlowRole role, bool thick_bridge) const
 // Fill in layerm->fill_surfaces by trimming the layerm->slices by the cummulative layerm->fill_surfaces.
 void LayerRegion::slices_to_fill_surfaces_clipped()
 {
-    // Note: this method should be idempotent, but fill_surfaces gets modified 
+    // Note: this method should be idempotent, but fill_surfaces gets modified
     // in place. However we're now only using its boundaries (which are invariant)
     // so we're safe. This guarantees idempotence of prepare_infill() also in case
     // that combine_infill() turns some fill_surface into VOID surfaces.
@@ -64,12 +64,73 @@ void LayerRegion::slices_to_fill_surfaces_clipped()
     }
 }
 
+void LayerRegion::auto_circle_compensation(SurfaceCollection& slices)
+{
+     const PrintObjectConfig &object_config = this->layer()->object()->config();
+     double max_deviation = object_config.max_deviation * 1e6;
+     double max_variance  = object_config.max_variance * 1e6;
+     double limited_speed = object_config.circle_compensation_speed;
+
+     double counter_speed_coef = object_config.counter_coef_1 / 1e6;
+     double counter_diameter_coef   = object_config.counter_coef_2 / 1e6;
+     double counter_compensate_coef = object_config.counter_coef_3;
+
+     double hole_speed_coef      = object_config.hole_coef_1 / 1e6;
+     double hole_diameter_coef   = object_config.hole_coef_2 / 1e6;
+     double hole_compensate_coef = object_config.hole_coef_3;
+
+     double counter_limit_min_value = object_config.counter_limit_min;
+     double counter_limit_max_value = object_config.counter_limit_max;
+     double hole_limit_min_value    = object_config.hole_limit_min;
+     double hole_limit_max_value    = object_config.hole_limit_max;
+
+     double diameter_limit_value = object_config.diameter_limit;
+
+    for (Surface &surface : slices.surfaces) {
+        Point  center;
+        double diameter = 0;
+        if (surface.expolygon.contour.is_approx_circle(max_deviation, max_variance, center, diameter)) {
+            double offset_value = counter_speed_coef * limited_speed + counter_diameter_coef * diameter + counter_compensate_coef;
+            if (offset_value < counter_limit_min_value) {
+                offset_value = counter_limit_min_value;
+            } else if (offset_value > counter_limit_max_value) {
+                offset_value = counter_limit_max_value;
+            }
+            Polygons offseted_polys = offset(surface.expolygon.contour, offset_value);
+            if (offseted_polys.size() == 1) {
+                surface.expolygon.contour = offseted_polys[0];
+                if (diameter < diameter_limit_value * 1e6)
+                    surface.counter_circle_compensation = true;
+            }
+        }
+        for (size_t i = 0; i < surface.expolygon.holes.size(); ++i) {
+            Polygon &hole = surface.expolygon.holes[i];
+            if (hole.is_approx_circle(max_deviation, max_variance, center, diameter)) {
+                double offset_value = hole_speed_coef * limited_speed + hole_diameter_coef * diameter + hole_compensate_coef;
+                if (offset_value < hole_limit_min_value) {
+                    offset_value = hole_limit_min_value;
+                } else if (offset_value > hole_limit_max_value) {
+                    offset_value = hole_limit_max_value;
+                }
+                // positive value means shrinking hole, which oppsite to contour
+                offset_value            = -offset_value;
+                Polygons offseted_polys = offset(hole, offset_value);
+                if (offseted_polys.size() == 1) {
+                    hole = offseted_polys[0];
+                    if (diameter < diameter_limit_value * 1e6)
+                        surface.holes_circle_compensation.push_back(i);
+                }
+            }
+        }
+    }
+}
+
 void LayerRegion::make_perimeters(const SurfaceCollection &slices, SurfaceCollection *fill_surfaces, ExPolygons *fill_no_overlap, std::vector<LoopNode> &loop_nodes)
 {
     this->perimeters.clear();
     this->thin_fills.clear();
 
-    const PrintConfig       &print_config  = this->layer()->object()->print()->config();
+    const PrintConfig &      print_config  = this->layer()->object()->print()->config();
     const PrintRegionConfig &region_config = this->region().config();
     const PrintObjectConfig& object_config = this->layer()->object()->config();
     // This needs to be in sync with PrintObject::_slice() slicing_mode_normal_below_layer!
@@ -87,7 +148,6 @@ void LayerRegion::make_perimeters(const SurfaceCollection &slices, SurfaceCollec
         &this->layer()->object()->config(),
         &print_config,
         spiral_mode,
-        
         // output:
         &this->perimeters,
         &this->thin_fills,
@@ -96,13 +156,13 @@ void LayerRegion::make_perimeters(const SurfaceCollection &slices, SurfaceCollec
         fill_no_overlap,
         &loop_nodes
     );
-    
+
     if (this->layer()->lower_layer != nullptr)
         // Cummulative sum of polygons over all the regions.
         g.lower_slices = &this->layer()->lower_layer->lslices;
     if (this->layer()->upper_layer != NULL)
         g.upper_slices = &this->layer()->upper_layer->lslices;
-    
+
     g.layer_id              = (int)this->layer()->id();
     g.ext_perimeter_flow    = this->flow(frExternalPerimeter);
     g.overhang_flow         = this->bridging_flow(frPerimeter, object_config.thick_bridges);
@@ -658,13 +718,13 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
             static int iRun = 0;
             SVG svg(debug_out_path("3_process_external_surfaces-fill_regions-%d.svg", iRun ++).c_str(), get_extents(fill_boundaries_ex));
             svg.draw(fill_boundaries_ex);
-            svg.draw_outline(fill_boundaries_ex, "black", "blue", scale_(0.05)); 
+            svg.draw_outline(fill_boundaries_ex, "black", "blue", scale_(0.05));
             svg.Close();
         }
 
 //        export_region_fill_surfaces_to_svg_debug("3_process_external_surfaces-initial");
 #endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
- 
+
         {
             // Bridge expolygons, grown, to be tested for intersection with other bridge regions.
             std::vector<BoundingBox> fill_boundaries_ex_bboxes = get_extents_vector(fill_boundaries_ex);
@@ -675,7 +735,7 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
                 const Point pt = bridges[i].expolygon.contour.points.front();
                 int idx_island = -1;
                 for (int j = 0; j < int(fill_boundaries_ex.size()); ++ j)
-                    if (fill_boundaries_ex_bboxes[j].contains(pt) && 
+                    if (fill_boundaries_ex_bboxes[j].contains(pt) &&
                         fill_boundaries_ex[j].contains(pt)) {
                         idx_island = j;
                         break;
@@ -697,7 +757,7 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
 
         // 2) Group the bridge surfaces by overlaps.
         std::vector<size_t> bridge_group(bridges.size(), (size_t)-1);
-        size_t n_groups = 0; 
+        size_t n_groups = 0;
         for (size_t i = 0; i < bridges.size(); ++ i) {
             // A grup id for this bridge.
             size_t group_id = (bridge_group[i] == size_t(-1)) ? (n_groups ++) : bridge_group[i];
@@ -821,7 +881,7 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
                 s1);
         }
     }
-    
+
     // Subtract the new top surfaces from the other non-top surfaces and re-add them.
     Polygons new_polygons = to_polygons(new_surfaces);
     for (size_t i = 0; i < internal.size(); ++ i) {
@@ -841,7 +901,7 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
         polygons_append(new_polygons, to_polygons(new_expolys));
         surfaces_append(new_surfaces, std::move(new_expolys), s1);
     }
-    
+
     this->fill_surfaces.surfaces = std::move(new_surfaces);
 
 #ifdef SLIC3R_DEBUG_SLICE_PROCESSING
@@ -855,12 +915,12 @@ void LayerRegion::prepare_fill_surfaces()
 #ifdef SLIC3R_DEBUG_SLICE_PROCESSING
     export_region_slices_to_svg_debug("2_prepare_fill_surfaces-initial");
     export_region_fill_surfaces_to_svg_debug("2_prepare_fill_surfaces-initial");
-#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */ 
+#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
 
     /*  Note: in order to make the psPrepareInfill step idempotent, we should never
         alter fill_surfaces boundaries on which our idempotency relies since that's
         the only meaningful information returned by psPerimeters. */
-    
+
     bool spiral_mode = this->layer()->object()->print()->config().spiral_mode;
 
 #if 0
@@ -960,7 +1020,7 @@ void LayerRegion::export_region_fill_surfaces_to_svg(const char *path) const
     const float transparency = 0.5f;
     for (const Surface &surface : this->fill_surfaces.surfaces) {
         svg.draw(surface.expolygon, surface_type_to_color_name(surface.surface_type), transparency);
-        svg.draw_outline(surface.expolygon, "black", "blue", scale_(0.05)); 
+        svg.draw_outline(surface.expolygon, "black", "blue", scale_(0.05));
     }
     export_surface_type_legend_to_svg(svg, legend_pos);
     svg.Close();
@@ -1049,4 +1109,3 @@ void LayerRegion::simplify_loop(ExtrusionLoop* loop)
 }
 
 }
- 
diff --git a/src/libslic3r/PerimeterGenerator.cpp b/src/libslic3r/PerimeterGenerator.cpp
index eb07bf89d..0926a9986 100644
--- a/src/libslic3r/PerimeterGenerator.cpp
+++ b/src/libslic3r/PerimeterGenerator.cpp
@@ -46,14 +46,16 @@ public:
     // BBS: is perimeter using smaller width
     bool is_smaller_width_perimeter;
     // Depth in the hierarchy. External perimeter has depth = 0. An external perimeter could be both a contour and a hole.
-    unsigned short                      depth;
+    unsigned short depth;
     // Should this contur be fuzzyfied on path generation?
     bool                                fuzzify;
+    // Slow down speed for circle
+    bool                                need_circle_compensation = false;
     // Children contour, may be both CCW and CW oriented (outer contours or holes).
     std::vector<PerimeterGeneratorLoop> children;
 
-    PerimeterGeneratorLoop(const Polygon &polygon, unsigned short depth, bool is_contour, bool fuzzify, bool is_small_width_perimeter = false) :
-        polygon(polygon), is_contour(is_contour), is_smaller_width_perimeter(is_small_width_perimeter), depth(depth), fuzzify(fuzzify) {}
+    PerimeterGeneratorLoop(const Polygon &polygon, unsigned short depth, bool is_contour, bool fuzzify, bool is_small_width_perimeter = false, bool need_circle_compensation_ = false) :
+        polygon(polygon), is_contour(is_contour), is_smaller_width_perimeter(is_small_width_perimeter), depth(depth), fuzzify(fuzzify), need_circle_compensation(need_circle_compensation_) {}
     // External perimeter. It may be CCW or CW oriented (outer contour or hole contour).
     bool is_external() const { return this->depth == 0; }
     // An island, which may have holes, but it does not have another internal island.
@@ -452,6 +454,7 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
     for (const PerimeterGeneratorLoop &loop : loops) {
         bool is_external = loop.is_external();
         bool is_small_width = loop.is_smaller_width_perimeter;
+        CustomizeFlag flag = loop.need_circle_compensation ? CustomizeFlag::cfCircleCompensation : CustomizeFlag::cfNone;
 
         ExtrusionRole role;
         ExtrusionLoopRole loop_role;
@@ -631,7 +634,11 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
             paths.emplace_back(std::move(path));
         }
 
-        coll.append(ExtrusionLoop(std::move(paths), loop_role));
+        for (ExtrusionPath& path : paths) {
+            path.set_customize_flag(flag);
+        }
+
+        coll.append(ExtrusionLoop(std::move(paths), loop_role, flag));
     }
 
     // Append thin walls to the nearest-neighbor search (only for first iteration)
@@ -1185,7 +1192,26 @@ void PerimeterGenerator::process_classic()
         if (loop_number > 0 && ((this->object_config->top_one_wall_type != TopOneWallType::None && this->upper_slices == nullptr) || (this->object_config->only_one_wall_first_layer && layer_id == 0)))
             loop_number = 0;
 
+        bool counter_circle_compensation = surface.counter_circle_compensation;
+        std::vector<Point> compensation_holes_centers;
+        for (size_t i = 0; i < surface.holes_circle_compensation.size(); ++i) {
+            Point center = surface.expolygon.holes[i].centroid();
+            compensation_holes_centers.emplace_back(center);
+        }
+
+        double eps               = 1000;
+        auto   is_compensation_hole = [&compensation_holes_centers, &eps](const Polygon &hole) -> bool {
+            auto iter = std::find_if(compensation_holes_centers.begin(), compensation_holes_centers.end(), [&hole, &eps](const Point &item) {
+                double distance = std::sqrt(std::pow(hole.centroid().x() - item.x(), 2) + std::pow(hole.centroid().y() - item.y(), 2));
+                return distance < eps;
+            });
+
+            return iter != compensation_holes_centers.end();
+        };
+
         ExPolygons last        = union_ex(surface.expolygon.simplify_p(surface_simplify_resolution));
+        if (last.size() != 1)
+            counter_circle_compensation = false;
         ExPolygons gaps;
         ExPolygons top_fills;
         ExPolygons fill_clip;
@@ -1304,12 +1330,11 @@ void PerimeterGenerator::process_classic()
                         // outer contour may overlap with itself.
                         //FIXME evaluate the overlaps, annotate each point with an overlap depth,
                         // compensate for the depth of intersection.
-                        contours[i].emplace_back(expolygon.contour, i, true, fuzzify_contours);
-
+                        contours[i].emplace_back(PerimeterGeneratorLoop(expolygon.contour, i, true, fuzzify_contours, false, counter_circle_compensation));
                         if (!expolygon.holes.empty()) {
                             holes[i].reserve(holes[i].size() + expolygon.holes.size());
-                            for (const Polygon& hole : expolygon.holes)
-                                holes[i].emplace_back(hole, i, false, fuzzify_holes);
+                            for (const Polygon &hole : expolygon.holes)
+                                holes[i].emplace_back(hole, i, false, fuzzify_holes, false, is_compensation_hole(hole));
                         }
                     }
 
@@ -1345,11 +1370,11 @@ void PerimeterGenerator::process_classic()
                         }
 
                         for (const ExPolygon& expolygon : offsets_with_smaller_width) {
-                            contours[i].emplace_back(PerimeterGeneratorLoop(expolygon.contour, i, true, fuzzify_contours, true));
+                            contours[i].emplace_back(PerimeterGeneratorLoop(expolygon.contour, i, true, fuzzify_contours, true, counter_circle_compensation));
                             if (!expolygon.holes.empty()) {
                                 holes[i].reserve(holes[i].size() + expolygon.holes.size());
                                 for (const Polygon& hole : expolygon.holes)
-                                    holes[i].emplace_back(PerimeterGeneratorLoop(hole, i, false, fuzzify_contours, true));
+                                    holes[i].emplace_back(PerimeterGeneratorLoop(hole, i, false, fuzzify_contours, true, is_compensation_hole(hole)));
                             }
                         }
                     }
diff --git a/src/libslic3r/Polygon.cpp b/src/libslic3r/Polygon.cpp
index a13b6a482..e256aadee 100644
--- a/src/libslic3r/Polygon.cpp
+++ b/src/libslic3r/Polygon.cpp
@@ -99,6 +99,39 @@ void Polygon::douglas_peucker(double tolerance)
     this->points = std::move(p);
 }
 
+bool Polygon::is_approx_circle(double max_deviation, double max_variance, Point &center, double &diameter) const
+{
+    if (this->points.size() < 8) {
+        return false;
+    }
+
+    center = centroid();
+    std::vector<double> distances;
+    for (const auto &point : this->points) {
+        double distance = std::sqrt(std::pow(point.x() - center.x(), 2) + std::pow(point.y() - center.y(), 2));
+        distances.push_back(distance);
+    }
+
+    double max_dist = *std::max_element(distances.begin(), distances.end());
+    double min_dist = *std::min_element(distances.begin(), distances.end());
+
+    if ((max_dist - min_dist) > max_deviation) {
+        return false;
+    }
+
+    double avg_dist = std::accumulate(distances.begin(), distances.end(), 0.0) / distances.size();
+    double variance = 0;
+    for (double d : distances) { variance += std::pow(d - avg_dist, 2); }
+    variance /= distances.size();
+
+    if (variance > max_variance) {
+        return false;
+    }
+
+    diameter = 2 * avg_dist;
+    return true;
+}
+
 Polygons Polygon::simplify(double tolerance) const
 {
     // Works on CCW polygons only, CW contour will be reoriented to CCW by Clipper's simplify_polygons()!
diff --git a/src/libslic3r/Polygon.hpp b/src/libslic3r/Polygon.hpp
index 793228c9b..370df82cf 100644
--- a/src/libslic3r/Polygon.hpp
+++ b/src/libslic3r/Polygon.hpp
@@ -61,6 +61,10 @@ public:
     bool is_valid() const { return this->points.size() >= 3; }
     void douglas_peucker(double tolerance);
 
+    // Point &center : out, the center of circle
+    // double &diameter: out, the diameter of circle
+    bool is_approx_circle(double max_deviation, double max_variance, Point &center, double &diameter) const;
+
     // Does an unoriented polygon contain a point?
     bool contains(const Point &point) const { return Slic3r::contains(*this, point, true); }
     // Approximate on boundary test.
diff --git a/src/libslic3r/Preset.cpp b/src/libslic3r/Preset.cpp
index 361bbd8c5..8e86eb0f5 100644
--- a/src/libslic3r/Preset.cpp
+++ b/src/libslic3r/Preset.cpp
@@ -880,6 +880,9 @@ static std::vector<std::string> s_Preset_print_options {
     "top_surface_line_width", "support_line_width", "infill_wall_overlap", "bridge_flow",
     "elefant_foot_compensation", "xy_contour_compensation", "xy_hole_compensation", "resolution", "enable_prime_tower",
     "prime_tower_width", "prime_tower_brim_width", "prime_tower_outer_first", "prime_volume",
+    "enable_circle_compensation", "circle_compensation_speed", "max_deviation", "max_variance",
+    "counter_coef_1", "counter_coef_2", "counter_coef_3", "hole_coef_1", "hole_coef_2", "hole_coef_3",
+    "counter_limit_min", "counter_limit_max", "hole_limit_min", "hole_limit_max", "diameter_limit",
     "wipe_tower_no_sparse_layers", "compatible_printers", "compatible_printers_condition", "inherits",
     "flush_into_infill", "flush_into_objects", "flush_into_support","process_notes",
     // BBS
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 0afc71caa..9ce4dc221 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -4164,8 +4164,100 @@ void PrintConfigDef::init_fff_params()
     def->mode = comSimple;
     def->set_default_value(new ConfigOptionBool(false));
 
+    def          = this->add("enable_circle_compensation", coBool);
+    def->label   = L("Auto holes-contour compensation");
+    def->tooltip = L("enable_circle_compensation");
+    def->mode    = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
+    def             = this->add("circle_compensation_speed", coFloat);
+    def->label      = L("Circle Compensation Speed");
+    def->tooltip    = L("circle_compensation_speed");
+    def->sidetext   = L("mm/s");
+    def->min        = 0;
+    def->set_default_value(new ConfigOptionFloat(200));
+
+    def           = this->add("max_deviation", coFloat);
+    def->label    = L("Deviation");
+    def->tooltip  = L("max_deviation");
+    def->sidetext = L("mm");
+    def->min      = 0;
+    def->set_default_value(new ConfigOptionFloat(0.5));
+
+    def           = this->add("max_variance", coFloat);
+    def->label    = L("Variance");
+    def->tooltip  = L("max_variance");
+    def->min      = 0;
+    def->set_default_value(new ConfigOptionFloat(500));
+
+    def          = this->add("counter_coef_1", coFloat);
+    def->label   = L("Counter Coef 1");
+    def->tooltip = L("counter_coef_1");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(0));
+
+    def          = this->add("counter_coef_2", coFloat);
+    def->label   = L("Counter Coef 2");
+    def->tooltip = L("counter_coef_2");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(25000));
+
+    def          = this->add("counter_coef_3", coFloat);
+    def->label   = L("Counter Coef 3");
+    def->tooltip = L("counter_coef_3");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(-110000));
+
+    def           = this->add("hole_coef_1", coFloat);
+    def->label    = L("Hole Coef 1");
+    def->tooltip  = L("hole_coef_1");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(0));
+
+    def           = this->add("hole_coef_2", coFloat);
+    def->label    = L("Hole Coef 2");
+    def->tooltip  = L("hole_coef_2");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(-25000));
+
+    def           = this->add("hole_coef_3", coFloat);
+    def->label    = L("Hole Coef 3");
+    def->tooltip  = L("hole_coef_3");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(280000));
+
+    def           = this->add("counter_limit_min", coFloat);
+    def->label    = L("Counter limit min");
+    def->tooltip  = L("counter_limit_min");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(-40000));
+
+    def           = this->add("counter_limit_max", coFloat);
+    def->label    = L("Counter limit max");
+    def->tooltip  = L("counter_limit_max");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(50000));
+
+    def           = this->add("hole_limit_min", coFloat);
+    def->label    = L("Hole limit min");
+    def->tooltip  = L("hole_limit_min");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(80000));
+
+    def           = this->add("hole_limit_max", coFloat);
+    def->label    = L("Hole limit max");
+    def->tooltip  = L("hole_limit_max");
+    def->sidetext = L("/1e6");
+    def->set_default_value(new ConfigOptionFloat(250000));
+
+    def           = this->add("diameter_limit", coFloat);
+    def->label    = L("Diameter limit");
+    def->tooltip  = L("diameter_limit");
+    def->sidetext = L("mm");
+    def->set_default_value(new ConfigOptionFloat(50));
+
     def = this->add("flush_volumes_vector", coFloats);
-    // BBS: remove _L()
+    // BBS: remove _L()w
     def->label = ("Purging volumes - load/unload volumes");
     //def->tooltip = L("This vector saves required volumes to change from/to each tool used on the "
     //                 "wipe tower. These values are used to simplify creation of the full purging "
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 279ee194e..d0069530d 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -822,6 +822,22 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,               support_object_first_layer_gap))
     ((ConfigOptionFloat,               xy_hole_compensation))
     ((ConfigOptionFloat,               xy_contour_compensation))
+    //BBS auto hole contour compensation
+    ((ConfigOptionBool,               enable_circle_compensation))
+    ((ConfigOptionFloat,              circle_compensation_speed))
+    ((ConfigOptionFloat,              max_deviation))
+    ((ConfigOptionFloat,              max_variance))
+    ((ConfigOptionFloat,              counter_coef_1))
+    ((ConfigOptionFloat,              counter_coef_2))
+    ((ConfigOptionFloat,              counter_coef_3))
+    ((ConfigOptionFloat,              hole_coef_1))
+    ((ConfigOptionFloat,              hole_coef_2))
+    ((ConfigOptionFloat,              hole_coef_3))
+    ((ConfigOptionFloat,              counter_limit_min))
+    ((ConfigOptionFloat,              counter_limit_max))
+    ((ConfigOptionFloat,              hole_limit_min))
+    ((ConfigOptionFloat,              hole_limit_max))
+    ((ConfigOptionFloat,              diameter_limit))
     ((ConfigOptionBool,                flush_into_objects))
     // BBS
     ((ConfigOptionBool,                flush_into_infill))
diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index 85cadf3dc..48fad2ed1 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -798,7 +798,22 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "only_one_wall_first_layer"
             || opt_key == "initial_layer_line_width"
             || opt_key == "inner_wall_line_width"
-            || opt_key == "infill_wall_overlap") {
+            || opt_key == "infill_wall_overlap"
+            || opt_key == "enable_circle_compensation"
+            || opt_key == "circle_compensation_speed"
+            || opt_key == "max_deviation"
+            || opt_key == "max_variance"
+            || opt_key == "counter_coef_1"
+            || opt_key == "counter_coef_2"
+            || opt_key == "counter_coef_3"
+            || opt_key == "hole_coef_1"
+            || opt_key == "hole_coef_2"
+            || opt_key == "hole_coef_3"
+            || opt_key == "counter_limit_min"
+            || opt_key == "counter_limit_max"
+            || opt_key == "hole_limit_min"
+            || opt_key == "hole_limit_max"
+            || opt_key == "diameter_limit") {
             steps.emplace_back(posPerimeters);
         } else if (opt_key == "gap_infill_speed" || opt_key == "filter_out_gap_fill") {
             // Return true if gap-fill speed has changed from zero value to non-zero or from non-zero value to zero.
diff --git a/src/libslic3r/Surface.hpp b/src/libslic3r/Surface.hpp
index 96b4e7b8c..25cf0ff27 100644
--- a/src/libslic3r/Surface.hpp
+++ b/src/libslic3r/Surface.hpp
@@ -37,6 +37,8 @@ public:
     unsigned short  thickness_layers;   // in layers
     double          bridge_angle;       // in radians, ccw, 0 = East, only 0+ (negative means undefined)
     unsigned short  extra_perimeters;
+    bool            counter_circle_compensation{false};
+    std::vector<int> holes_circle_compensation; // hole index
 
     Surface(SurfaceType _surface_type = stInternal)
         : surface_type(_surface_type),
diff --git a/src/slic3r/GUI/ConfigManipulation.cpp b/src/slic3r/GUI/ConfigManipulation.cpp
index b92f35ecf..7de993603 100644
--- a/src/slic3r/GUI/ConfigManipulation.cpp
+++ b/src/slic3r/GUI/ConfigManipulation.cpp
@@ -266,6 +266,16 @@ void ConfigManipulation::update_print_fff_config(DynamicPrintConfig* config, con
         is_msg_dlg_already_exist = false;
     }
 
+    //if enable auto hole and contour compensation, disable the manner
+    if (config->opt_bool("enable_circle_compensation")) {
+        DynamicPrintConfig new_conf = *config;
+        is_msg_dlg_already_exist    = true;
+        new_conf.set_key_value("xy_contour_compensation", new ConfigOptionFloat(0));
+        new_conf.set_key_value("xy_hole_compensation", new ConfigOptionFloat(0));
+        apply(config, &new_conf);
+        is_msg_dlg_already_exist = false;
+    }
+
     if (config->option<ConfigOptionFloat>("elefant_foot_compensation")->value > 1)
     {
         const wxString msg_text = _(L("Too large elephant foot compensation is unreasonable.\n"
@@ -715,6 +725,12 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig *config, in
     toggle_line("interlocking_beam_layer_count", use_beam_interlocking);
     toggle_line("interlocking_depth", use_beam_interlocking);
     toggle_line("interlocking_boundary_avoidance", use_beam_interlocking);
+
+    bool enable_auto_hole_and_contour_compensation = config->opt_bool("enable_circle_compensation");
+    for (auto el : {"max_deviation", "max_variance", "circle_compensation_speed", "counter_coef_1", "counter_coef_2", "counter_coef_3", "hole_coef_1", "hole_coef_2", "hole_coef_3", "counter_limit_min", "counter_limit_max", "hole_limit_min", "hole_limit_max", "diameter_limit"})
+        toggle_line(el, enable_auto_hole_and_contour_compensation);
+    toggle_field("xy_hole_compensation", !enable_auto_hole_and_contour_compensation);
+    toggle_field("xy_contour_compensation", !enable_auto_hole_and_contour_compensation);
 }
 
 void ConfigManipulation::update_print_sla_config(DynamicPrintConfig* config, const bool is_global_config/* = false*/)
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 9fd18bf9e..bbd93faf5 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -2006,6 +2006,21 @@ void TabPrint::build()
         optgroup->append_single_option_line("xy_hole_compensation", "xy-hole-contour-compensation");
         optgroup->append_single_option_line("xy_contour_compensation", "xy-hole-contour-compensation");
         optgroup->append_single_option_line("elefant_foot_compensation", "parameter/elephant-foot");
+        optgroup->append_single_option_line("enable_circle_compensation");
+        optgroup->append_single_option_line("circle_compensation_speed");
+        optgroup->append_single_option_line("max_deviation");
+        optgroup->append_single_option_line("max_variance");
+        optgroup->append_single_option_line("counter_coef_1");
+        optgroup->append_single_option_line("counter_coef_2");
+        optgroup->append_single_option_line("counter_coef_3");
+        optgroup->append_single_option_line("hole_coef_1");
+        optgroup->append_single_option_line("hole_coef_2");
+        optgroup->append_single_option_line("hole_coef_3");
+        optgroup->append_single_option_line("counter_limit_min");
+        optgroup->append_single_option_line("counter_limit_max");
+        optgroup->append_single_option_line("hole_limit_min");
+        optgroup->append_single_option_line("hole_limit_max");
+        optgroup->append_single_option_line("diameter_limit");
         optgroup->append_single_option_line("precise_z_height");
 
         optgroup = page->new_optgroup(L("Ironing"), L"param_ironing");