Merge remote-tracking branch 'origin/lm_wipe_tower_block_improvements_merged'

16 files changed, 270 insertions, 73 deletions

diff --git a/xs/src/libslic3r/GCode.cpp b/xs/src/libslic3r/GCode.cpp
index 261c8e59d..1c1eeee6f 100644
--- a/xs/src/libslic3r/GCode.cpp
+++ b/xs/src/libslic3r/GCode.cpp
@@ -167,6 +167,18 @@ std::string WipeTowerIntegration::append_tcr(GCode &gcodegen, const WipeTower::T
 {
     std::string gcode;
 
+    // Toolchangeresult.gcode assumes the wipe tower corner is at the origin
+    // We want to rotate and shift all extrusions (gcode postprocessing) and starting and ending position
+    float alpha = m_wipe_tower_rotation/180.f * M_PI;
+    WipeTower::xy start_pos = tcr.start_pos;
+    WipeTower::xy end_pos = tcr.end_pos;
+    start_pos.rotate(alpha);
+    start_pos.translate(m_wipe_tower_pos);
+    end_pos.rotate(alpha);
+    end_pos.translate(m_wipe_tower_pos);
+    std::string tcr_rotated_gcode = rotate_wipe_tower_moves(tcr.gcode, tcr.start_pos, m_wipe_tower_pos, alpha);
+    
+
     // Disable linear advance for the wipe tower operations.
     gcode += "M900 K0\n";
     // Move over the wipe tower.
@@ -174,14 +186,14 @@ std::string WipeTowerIntegration::append_tcr(GCode &gcodegen, const WipeTower::T
     gcode += gcodegen.retract(true);
     gcodegen.m_avoid_crossing_perimeters.use_external_mp_once = true;
     gcode += gcodegen.travel_to(
-        wipe_tower_point_to_object_point(gcodegen, tcr.start_pos),
+        wipe_tower_point_to_object_point(gcodegen, start_pos),
         erMixed,
         "Travel to a Wipe Tower");
     gcode += gcodegen.unretract();
 
     // Let the tool change be executed by the wipe tower class.
     // Inform the G-code writer about the changes done behind its back.
-    gcode += tcr.gcode;
+    gcode += tcr_rotated_gcode;
     // Let the m_writer know the current extruder_id, but ignore the generated G-code.
 	if (new_extruder_id >= 0 && gcodegen.writer().need_toolchange(new_extruder_id))
         gcodegen.writer().toolchange(new_extruder_id);
@@ -195,18 +207,18 @@ std::string WipeTowerIntegration::append_tcr(GCode &gcodegen, const WipeTower::T
         check_add_eol(gcode);
     }
     // A phony move to the end position at the wipe tower.
-    gcodegen.writer().travel_to_xy(Pointf(tcr.end_pos.x, tcr.end_pos.y));
-    gcodegen.set_last_pos(wipe_tower_point_to_object_point(gcodegen, tcr.end_pos));
+    gcodegen.writer().travel_to_xy(Pointf(end_pos.x, end_pos.y));
+    gcodegen.set_last_pos(wipe_tower_point_to_object_point(gcodegen, end_pos));
 
     // Prepare a future wipe.
     gcodegen.m_wipe.path.points.clear();
     if (new_extruder_id >= 0) {
         // Start the wipe at the current position.
-        gcodegen.m_wipe.path.points.emplace_back(wipe_tower_point_to_object_point(gcodegen, tcr.end_pos));
+        gcodegen.m_wipe.path.points.emplace_back(wipe_tower_point_to_object_point(gcodegen, end_pos));
         // Wipe end point: Wipe direction away from the closer tower edge to the further tower edge.
         gcodegen.m_wipe.path.points.emplace_back(wipe_tower_point_to_object_point(gcodegen, 
-            WipeTower::xy((std::abs(m_left - tcr.end_pos.x) < std::abs(m_right - tcr.end_pos.x)) ? m_right : m_left,
-            tcr.end_pos.y)));
+            WipeTower::xy((std::abs(m_left - end_pos.x) < std::abs(m_right - end_pos.x)) ? m_right : m_left,
+            end_pos.y)));
     }
 
     // Let the planner know we are traveling between objects.
@@ -214,6 +226,57 @@ std::string WipeTowerIntegration::append_tcr(GCode &gcodegen, const WipeTower::T
     return gcode;
 }
 
+// This function postprocesses gcode_original, rotates and moves all G1 extrusions and returns resulting gcode
+// Starting position has to be supplied explicitely (otherwise it would fail in case first G1 command only contained one coordinate)
+std::string WipeTowerIntegration::rotate_wipe_tower_moves(const std::string& gcode_original, const WipeTower::xy& start_pos, const WipeTower::xy& translation, float angle) const
+{
+    std::istringstream gcode_str(gcode_original);
+    std::string gcode_out;
+    std::string line;
+    WipeTower::xy pos = start_pos;
+    WipeTower::xy transformed_pos;
+    WipeTower::xy old_pos(-1000.1f, -1000.1f);
+
+    while (gcode_str) {
+        std::getline(gcode_str, line);  // we read the gcode line by line
+        if (line.find("G1 ") == 0) {
+            std::ostringstream line_out;
+            std::istringstream line_str(line);
+            line_str >> std::noskipws;  // don't skip whitespace
+            char ch = 0;
+            while (line_str >> ch) {
+                if (ch == 'X')
+                    line_str >> pos.x;
+                else
+                    if (ch == 'Y')
+                        line_str >> pos.y;
+                    else
+                        line_out << ch;
+            }
+
+            transformed_pos = pos;
+            transformed_pos.rotate(angle);
+            transformed_pos.translate(translation);
+
+            if (transformed_pos != old_pos) {
+                line = line_out.str();
+                char buf[2048] = "G1";
+                if (transformed_pos.x != old_pos.x)
+                    sprintf(buf + strlen(buf), " X%.3f", transformed_pos.x);
+                if (transformed_pos.y != old_pos.y)
+                    sprintf(buf + strlen(buf), " Y%.3f", transformed_pos.y);
+
+                line.replace(line.find("G1 "), 3, buf);
+                old_pos = transformed_pos;
+            }
+        }
+        gcode_out += line + "\n";
+    }
+    return gcode_out;
+}
+
+
+
 std::string WipeTowerIntegration::prime(GCode &gcodegen)
 {
     assert(m_layer_idx == 0);
diff --git a/xs/src/libslic3r/GCode.hpp b/xs/src/libslic3r/GCode.hpp
index 8b40385e6..4953c39fe 100644
--- a/xs/src/libslic3r/GCode.hpp
+++ b/xs/src/libslic3r/GCode.hpp
@@ -83,8 +83,10 @@ public:
         const WipeTower::ToolChangeResult                           &priming,
         const std::vector<std::vector<WipeTower::ToolChangeResult>> &tool_changes,
         const WipeTower::ToolChangeResult                           &final_purge) :
-        m_left(float(print_config.wipe_tower_x.value)),
-        m_right(float(print_config.wipe_tower_x.value + print_config.wipe_tower_width.value)),
+        m_left(/*float(print_config.wipe_tower_x.value)*/ 0.f),
+        m_right(float(/*print_config.wipe_tower_x.value +*/ print_config.wipe_tower_width.value)),
+        m_wipe_tower_pos(float(print_config.wipe_tower_x.value), float(print_config.wipe_tower_y.value)),
+        m_wipe_tower_rotation(float(print_config.wipe_tower_rotation_angle)),
         m_priming(priming),
         m_tool_changes(tool_changes),
         m_final_purge(final_purge),
@@ -101,9 +103,14 @@ private:
     WipeTowerIntegration& operator=(const WipeTowerIntegration&);
     std::string append_tcr(GCode &gcodegen, const WipeTower::ToolChangeResult &tcr, int new_extruder_id) const;
 
+    // Postprocesses gcode: rotates and moves all G1 extrusions and returns result
+    std::string rotate_wipe_tower_moves(const std::string& gcode_original, const WipeTower::xy& start_pos, const WipeTower::xy& translation, float angle) const;
+
     // Left / right edges of the wipe tower, for the planning of wipe moves.
     const float                                                  m_left;
     const float                                                  m_right;
+    const WipeTower::xy                                          m_wipe_tower_pos;
+    const float                                                  m_wipe_tower_rotation;
     // Reference to cached values at the Printer class.
     const WipeTower::ToolChangeResult                           &m_priming;
     const std::vector<std::vector<WipeTower::ToolChangeResult>> &m_tool_changes;
@@ -112,6 +119,7 @@ private:
     int                                                          m_layer_idx;
     int                                                          m_tool_change_idx;
     bool                                                         m_brim_done;
+    bool                                                         i_have_brim = false;
 };
 
 class GCode {
diff --git a/xs/src/libslic3r/GCode/PrintExtents.cpp b/xs/src/libslic3r/GCode/PrintExtents.cpp
index 3c3f0f8d5..37b79f343 100644
--- a/xs/src/libslic3r/GCode/PrintExtents.cpp
+++ b/xs/src/libslic3r/GCode/PrintExtents.cpp
@@ -134,6 +134,11 @@ BoundingBoxf get_print_object_extrusions_extents(const PrintObject &print_object
 // The projection does not contain the priming regions.
 BoundingBoxf get_wipe_tower_extrusions_extents(const Print &print, const coordf_t max_print_z)
 {
+    // Wipe tower extrusions are saved as if the tower was at the origin with no rotation
+    // We need to get position and angle of the wipe tower to transform them to actual position.
+    Pointf wipe_tower_pos(print.config.wipe_tower_x.value, print.config.wipe_tower_y.value);
+    float wipe_tower_angle = print.config.wipe_tower_rotation_angle.value;
+
     BoundingBoxf bbox;
     for (const std::vector<WipeTower::ToolChangeResult> &tool_changes : print.m_wipe_tower_tool_changes) {
         if (! tool_changes.empty() && tool_changes.front().print_z > max_print_z)
@@ -144,6 +149,11 @@ BoundingBoxf get_wipe_tower_extrusions_extents(const Print &print, const coordf_
                 if (e.width > 0) {
                     Pointf  p1((&e - 1)->pos.x, (&e - 1)->pos.y);
                     Pointf  p2(e.pos.x, e.pos.y);
+                    p1.rotate(wipe_tower_angle);
+                    p1.translate(wipe_tower_pos);
+                    p2.rotate(wipe_tower_angle);
+                    p2.translate(wipe_tower_pos);
+
                     bbox.merge(p1);
                     coordf_t radius = 0.5 * e.width;
                     bbox.min.x = std::min(bbox.min.x, std::min(p1.x, p2.x) - radius);
diff --git a/xs/src/libslic3r/GCode/WipeTower.hpp b/xs/src/libslic3r/GCode/WipeTower.hpp
index 36cebeb84..9bf350328 100644
--- a/xs/src/libslic3r/GCode/WipeTower.hpp
+++ b/xs/src/libslic3r/GCode/WipeTower.hpp
@@ -25,18 +25,30 @@ public:
 		bool operator==(const xy &rhs) const { return x == rhs.x && y == rhs.y; }
 		bool operator!=(const xy &rhs) const { return x != rhs.x || y != rhs.y; }
 		
-		// Rotate the point around given point about given angle (in degrees)
-		// shifts the result so that point of rotation is in the middle of the tower
-		xy rotate(const xy& origin, float width, float depth, float angle) const {
+		// Rotate the point around center of the wipe tower about given angle (in degrees)
+		xy rotate(float width, float depth, float angle) const {
 			xy out(0,0);
 			float temp_x = x - width / 2.f;
 			float temp_y = y - depth / 2.f;
 			angle *= M_PI/180.;
-			out.x += (temp_x - origin.x) * cos(angle)  -  (temp_y - origin.y) * sin(angle);
-			out.y += (temp_x - origin.x) * sin(angle)  +  (temp_y - origin.y) * cos(angle);
-			return out + origin;
+			out.x += temp_x * cos(angle)  -  temp_y * sin(angle) + width / 2.f;
+			out.y += temp_x * sin(angle)  +  temp_y * cos(angle) + depth / 2.f;
+
+			return out;
 		}
-		
+        
+        // Rotate the point around origin about given angle in degrees
+        void rotate(float angle) {
+            float temp_x = x * cos(angle)  -  y * sin(angle);
+			y = x * sin(angle)  +  y * cos(angle);
+            x = temp_x;
+		}
+
+        void translate(const xy& vect) {
+            x += vect.x;
+            y += vect.y;
+        }
+
 		float x;
 		float y;
 	};
@@ -104,6 +116,9 @@ public:
 		// This is useful not only for the print time estimation, but also for the control of layer cooling.
 		float  				    elapsed_time;
 
+        // Is this a priming extrusion? (If so, the wipe tower rotation & translation will not be applied later)
+        bool                    priming;
+
 		// Sum the total length of the extrusion.
 		float total_extrusion_length_in_plane() {
 			float e_length = 0.f;
diff --git a/xs/src/libslic3r/GCode/WipeTowerPrusaMM.cpp b/xs/src/libslic3r/GCode/WipeTowerPrusaMM.cpp
index f466fc4f6..3d0dba07a 100644
--- a/xs/src/libslic3r/GCode/WipeTowerPrusaMM.cpp
+++ b/xs/src/libslic3r/GCode/WipeTowerPrusaMM.cpp
@@ -5,7 +5,7 @@ TODO LIST
 
 1. cooling moves - DONE
 2. account for perimeter and finish_layer extrusions and subtract it from last wipe - DONE
-3. priming extrusions (last wipe must clear the color)
+3. priming extrusions (last wipe must clear the color) - DONE
 4. Peter's wipe tower - layer's are not exactly square
 5. Peter's wipe tower - variable width for higher levels
 6. Peter's wipe tower - make sure it is not too sparse (apply max_bridge_distance and make last wipe longer)
@@ -17,7 +17,6 @@ TODO LIST
 
 #include <assert.h>
 #include <math.h>
-#include <fstream>
 #include <iostream>
 #include <vector>
 #include <numeric>
@@ -68,8 +67,11 @@ public:
             return *this;
     }
 
-	Writer& 			 set_initial_position(const WipeTower::xy &pos) { 
-		m_start_pos = WipeTower::xy(pos,0.f,m_y_shift).rotate(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_angle_deg);
+	Writer& 			 set_initial_position(const WipeTower::xy &pos, float width = 0.f, float depth = 0.f, float internal_angle = 0.f) {
+        m_wipe_tower_width = width;
+        m_wipe_tower_depth = depth;
+        m_internal_angle = internal_angle;
+		m_start_pos = WipeTower::xy(pos,0.f,m_y_shift).rotate(m_wipe_tower_width, m_wipe_tower_depth, m_internal_angle);
 		m_current_pos = pos;
 		return *this;
 	}
@@ -81,9 +83,6 @@ public:
 
 	Writer& 			 set_extrusion_flow(float flow)
 		{ m_extrusion_flow = flow; return *this; }
-		
-	Writer&				 set_rotation(WipeTower::xy& pos, float width, float depth, float angle)
-		{ m_wipe_tower_pos = pos; m_wipe_tower_width = width; m_wipe_tower_depth=depth; m_angle_deg = angle; return (*this); }
 
 	Writer&				 set_y_shift(float shift) {
         m_current_pos.y -= shift-m_y_shift;
@@ -110,7 +109,7 @@ public:
 	float                y()     const { return m_current_pos.y; }
 	const WipeTower::xy& pos()   const { return m_current_pos; }
 	const WipeTower::xy	 start_pos_rotated() const { return m_start_pos; }
-	const WipeTower::xy  pos_rotated() const { return WipeTower::xy(m_current_pos,0.f,m_y_shift).rotate(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_angle_deg); }
+	const WipeTower::xy  pos_rotated() const { return WipeTower::xy(m_current_pos, 0.f, m_y_shift).rotate(m_wipe_tower_width, m_wipe_tower_depth, m_internal_angle); }
 	float 				 elapsed_time() const { return m_elapsed_time; }
 
 	// Extrude with an explicitely provided amount of extrusion.
@@ -125,9 +124,9 @@ public:
 		double len = sqrt(dx*dx+dy*dy);
 
 
-		// For rotated wipe tower, transform position to printer coordinates
-		WipeTower::xy rotated_current_pos(WipeTower::xy(m_current_pos,0.f,m_y_shift).rotate(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_angle_deg)); // this is where we are
-		WipeTower::xy rot(WipeTower::xy(x,y+m_y_shift).rotate(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_angle_deg));                               // this is where we want to go
+		// Now do the "internal rotation" with respect to the wipe tower center
+		WipeTower::xy rotated_current_pos(WipeTower::xy(m_current_pos,0.f,m_y_shift).rotate(m_wipe_tower_width, m_wipe_tower_depth, m_internal_angle)); // this is where we are
+		WipeTower::xy rot(WipeTower::xy(x,y+m_y_shift).rotate(m_wipe_tower_width, m_wipe_tower_depth, m_internal_angle));                               // this is where we want to go
 
 		if (! m_preview_suppressed && e > 0.f && len > 0.) {
 			// Width of a squished extrusion, corrected for the roundings of the squished extrusions.
@@ -147,6 +146,7 @@ public:
 		if (std::abs(rot.y - rotated_current_pos.y) > EPSILON)
 			m_gcode += set_format_Y(rot.y);
 
+
 		if (e != 0.f)
 			m_gcode += set_format_E(e);
 
@@ -397,9 +397,8 @@ private:
 	std::string   m_gcode;
 	std::vector<WipeTower::Extrusion> m_extrusions;
 	float         m_elapsed_time;
-	float   	  m_angle_deg = 0.f;
+	float   	  m_internal_angle = 0.f;
 	float		  m_y_shift = 0.f;
-	WipeTower::xy m_wipe_tower_pos;
 	float 		  m_wipe_tower_width = 0.f;
 	float		  m_wipe_tower_depth = 0.f;
 	float		  m_last_fan_speed = 0.f;
@@ -539,6 +538,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::prime(
 	m_print_brim = true;
 
 	ToolChangeResult result;
+    result.priming      = true;
 	result.print_z 	  	= this->m_z_pos;
 	result.layer_height = this->m_layer_height;
 	result.gcode   	  	= writer.gcode();
@@ -575,7 +575,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::tool_change(unsigned int tool, boo
 	}
 
 	box_coordinates cleaning_box(
-		m_wipe_tower_pos + xy(m_perimeter_width / 2.f, m_perimeter_width / 2.f),
+		xy(m_perimeter_width / 2.f, m_perimeter_width / 2.f),
 		m_wipe_tower_width - m_perimeter_width,
 		(tool != (unsigned int)(-1) ? /*m_layer_info->depth*/wipe_area+m_depth_traversed-0.5*m_perimeter_width
                                     : m_wipe_tower_depth-m_perimeter_width));
@@ -584,7 +584,6 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::tool_change(unsigned int tool, boo
 	writer.set_extrusion_flow(m_extrusion_flow)
 		.set_z(m_z_pos)
 		.set_initial_tool(m_current_tool)
-		.set_rotation(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_wipe_tower_rotation_angle)
 		.set_y_shift(m_y_shift + (tool!=(unsigned int)(-1) && (m_current_shape == SHAPE_REVERSED && !m_peters_wipe_tower) ? m_layer_info->depth - m_layer_info->toolchanges_depth(): 0.f))
 		.append(";--------------------\n"
 				"; CP TOOLCHANGE START\n")
@@ -594,7 +593,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::tool_change(unsigned int tool, boo
 		.speed_override(100);
 
 	xy initial_position = cleaning_box.ld + WipeTower::xy(0.f,m_depth_traversed);
-    writer.set_initial_position(initial_position);
+    writer.set_initial_position(initial_position, m_wipe_tower_width, m_wipe_tower_depth, m_internal_rotation);
 
     // Increase the extruder driver current to allow fast ramming.
     writer.set_extruder_trimpot(750);
@@ -616,11 +615,11 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::tool_change(unsigned int tool, boo
     if (last_change_in_layer) {// draw perimeter line
         writer.set_y_shift(m_y_shift);
         if (m_peters_wipe_tower)
-            writer.rectangle(m_wipe_tower_pos,m_layer_info->depth + 3*m_perimeter_width,m_wipe_tower_depth);
+            writer.rectangle(WipeTower::xy(0.f, 0.f),m_layer_info->depth + 3*m_perimeter_width,m_wipe_tower_depth);
         else {
-            writer.rectangle(m_wipe_tower_pos,m_wipe_tower_width, m_layer_info->depth + m_perimeter_width);
+            writer.rectangle(WipeTower::xy(0.f, 0.f),m_wipe_tower_width, m_layer_info->depth + m_perimeter_width);
             if (layer_finished()) { // no finish_layer will be called, we must wipe the nozzle
-                writer.travel(m_wipe_tower_pos.x + (writer.x()> (m_wipe_tower_pos.x + m_wipe_tower_width) / 2.f ? 0.f : m_wipe_tower_width), writer.y());
+                writer.travel(writer.x()> m_wipe_tower_width / 2.f ? 0.f : m_wipe_tower_width, writer.y());
             }
         }
     }
@@ -634,6 +633,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::tool_change(unsigned int tool, boo
                   "\n\n");
 
 	ToolChangeResult result;
+    result.priming      = false;
 	result.print_z 	  	= this->m_z_pos;
 	result.layer_height = this->m_layer_height;
 	result.gcode   	  	= writer.gcode();
@@ -647,7 +647,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::tool_change(unsigned int tool, boo
 WipeTower::ToolChangeResult WipeTowerPrusaMM::toolchange_Brim(bool sideOnly, float y_offset)
 {
 	const box_coordinates wipeTower_box(
-		m_wipe_tower_pos,
+		WipeTower::xy(0.f, 0.f),
 		m_wipe_tower_width,
 		m_wipe_tower_depth);
 
@@ -655,12 +655,11 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::toolchange_Brim(bool sideOnly, flo
 	writer.set_extrusion_flow(m_extrusion_flow * 1.1f)
 		  .set_z(m_z_pos) // Let the writer know the current Z position as a base for Z-hop.
 		  .set_initial_tool(m_current_tool)
-  		  .set_rotation(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_wipe_tower_rotation_angle)
 		  .append(";-------------------------------------\n"
 				  "; CP WIPE TOWER FIRST LAYER BRIM START\n");
 
 	xy initial_position = wipeTower_box.lu - xy(m_perimeter_width * 6.f, 0);
-	writer.set_initial_position(initial_position);
+	writer.set_initial_position(initial_position, m_wipe_tower_width, m_wipe_tower_depth, m_internal_rotation);
 
     writer.extrude_explicit(wipeTower_box.ld - xy(m_perimeter_width * 6.f, 0), // Prime the extruder left of the wipe tower.
         1.5f * m_extrusion_flow * (wipeTower_box.lu.y - wipeTower_box.ld.y), 2400);
@@ -685,6 +684,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::toolchange_Brim(bool sideOnly, flo
     m_print_brim = false;  // Mark the brim as extruded
 
 	ToolChangeResult result;
+    result.priming      = false;
 	result.print_z 	  	= this->m_z_pos;
 	result.layer_height = this->m_layer_height;
 	result.gcode   	  	= writer.gcode();
@@ -724,7 +724,7 @@ void WipeTowerPrusaMM::toolchange_Unload(
     if (m_layer_info > m_plan.begin() && m_layer_info < m_plan.end() && (m_layer_info-1!=m_plan.begin() || !m_adhesion )) {
 
         // this is y of the center of previous sparse infill border
-        float sparse_beginning_y = m_wipe_tower_pos.y;
+        float sparse_beginning_y = 0.f;
         if (m_current_shape == SHAPE_REVERSED)
             sparse_beginning_y += ((m_layer_info-1)->depth - (m_layer_info-1)->toolchanges_depth())
                                       - ((m_layer_info)->depth-(m_layer_info)->toolchanges_depth()) ;
@@ -742,7 +742,7 @@ void WipeTowerPrusaMM::toolchange_Unload(
         for (const auto& tch : m_layer_info->tool_changes) {  // let's find this toolchange
             if (tch.old_tool == m_current_tool) {
                 sum_of_depths += tch.ramming_depth;
-                float ramming_end_y = m_wipe_tower_pos.y + sum_of_depths;
+                float ramming_end_y = sum_of_depths;
                 ramming_end_y -= (y_step/m_extra_spacing-m_perimeter_width) / 2.f;   // center of final ramming line
 
                 // debugging:
@@ -950,7 +950,7 @@ void WipeTowerPrusaMM::toolchange_Wipe(
     if (m_layer_info != m_plan.end() && m_current_tool != m_layer_info->tool_changes.back().new_tool) {
         m_left_to_right = !m_left_to_right;
         writer.travel(writer.x(), writer.y() - dy)
-        .travel(m_wipe_tower_pos.x + (m_left_to_right ? m_wipe_tower_width : 0.f), writer.y());
+        .travel(m_left_to_right ? m_wipe_tower_width : 0.f, writer.y());
     }
 
 	writer.set_extrusion_flow(m_extrusion_flow); // Reset the extrusion flow.
@@ -969,7 +969,6 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::finish_layer()
 	writer.set_extrusion_flow(m_extrusion_flow)
 		.set_z(m_z_pos)
 		.set_initial_tool(m_current_tool)
-		.set_rotation(m_wipe_tower_pos, m_wipe_tower_width, m_wipe_tower_depth, m_wipe_tower_rotation_angle)
 		.set_y_shift(m_y_shift - (m_current_shape == SHAPE_REVERSED && !m_peters_wipe_tower ? m_layer_info->toolchanges_depth() : 0.f))
 		.append(";--------------------\n"
 				"; CP EMPTY GRID START\n")
@@ -978,14 +977,12 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::finish_layer()
 	// Slow down on the 1st layer.
 	float speed_factor = m_is_first_layer ? 0.5f : 1.f;
 	float current_depth = m_layer_info->depth - m_layer_info->toolchanges_depth();
-	box_coordinates fill_box(m_wipe_tower_pos + xy(m_perimeter_width, m_depth_traversed + m_perimeter_width),
+	box_coordinates fill_box(xy(m_perimeter_width, m_depth_traversed + m_perimeter_width),
 							 m_wipe_tower_width - 2 * m_perimeter_width, current_depth-m_perimeter_width);
 
-    if (m_left_to_right) // so there is never a diagonal travel
-        writer.set_initial_position(fill_box.ru);
-    else
-        writer.set_initial_position(fill_box.lu);
 
+    writer.set_initial_position((m_left_to_right ? fill_box.ru : fill_box.lu), // so there is never a diagonal travel
+                                 m_wipe_tower_width, m_wipe_tower_depth, m_internal_rotation);
 
 	box_coordinates box = fill_box;
     for (int i=0;i<2;++i) {
@@ -1044,6 +1041,7 @@ WipeTower::ToolChangeResult WipeTowerPrusaMM::finish_layer()
     m_depth_traversed = m_wipe_tower_depth-m_perimeter_width;
 
 	ToolChangeResult result;
+    result.priming      = false;
 	result.print_z 	  	= this->m_z_pos;
 	result.layer_height = this->m_layer_height;
 	result.gcode   	  	= writer.gcode();
@@ -1165,9 +1163,9 @@ void WipeTowerPrusaMM::generate(std::vector<std::vector<WipeTower::ToolChangeRes
 	{
 		set_layer(layer.z,layer.height,0,layer.z == m_plan.front().z,layer.z == m_plan.back().z);
 		if (m_peters_wipe_tower)
-			m_wipe_tower_rotation_angle += 90.f;
+			m_internal_rotation += 90.f;
 		else
-            m_wipe_tower_rotation_angle += 180.f;
+            m_internal_rotation += 180.f;
 
 		if (!m_peters_wipe_tower && m_layer_info->depth < m_wipe_tower_depth - m_perimeter_width)
 			m_y_shift = (m_wipe_tower_depth-m_layer_info->depth-m_perimeter_width)/2.f;
@@ -1188,7 +1186,7 @@ void WipeTowerPrusaMM::generate(std::vector<std::vector<WipeTower::ToolChangeRes
 					last_toolchange.gcode += buf;
 				}
                 last_toolchange.gcode += finish_layer_toolchange.gcode;
-                last_toolchange.extrusions.insert(last_toolchange.extrusions.end(),finish_layer_toolchange.extrusions.begin(),finish_layer_toolchange.extrusions.end());
+                last_toolchange.extrusions.insert(last_toolchange.extrusions.end(), finish_layer_toolchange.extrusions.begin(), finish_layer_toolchange.extrusions.end());
                 last_toolchange.end_pos = finish_layer_toolchange.end_pos;
             }
             else
diff --git a/xs/src/libslic3r/GCode/WipeTowerPrusaMM.hpp b/xs/src/libslic3r/GCode/WipeTowerPrusaMM.hpp
index 1ae4616d8..e1529bcf4 100644
--- a/xs/src/libslic3r/GCode/WipeTowerPrusaMM.hpp
+++ b/xs/src/libslic3r/GCode/WipeTowerPrusaMM.hpp
@@ -102,6 +102,8 @@ public:
 	// Iterates through prepared m_plan, generates ToolChangeResults and appends them to "result"
 	void generate(std::vector<std::vector<WipeTower::ToolChangeResult>> &result);
 
+    float get_depth() const { return m_wipe_tower_depth; }
+
 
 
 	// Switch to a next layer.
@@ -189,6 +191,7 @@ private:
 	float  m_wipe_tower_width; 			// Width of the wipe tower.
 	float  m_wipe_tower_depth 	= 0.f; 	// Depth of the wipe tower
 	float  m_wipe_tower_rotation_angle = 0.f; // Wipe tower rotation angle in degrees (with respect to x axis)
+    float  m_internal_rotation  = 0.f;
 	float  m_y_shift			= 0.f;  // y shift passed to writer
 	float  m_z_pos 				= 0.f;  // Current Z position.
 	float  m_layer_height 		= 0.f; 	// Current layer height.
diff --git a/xs/src/libslic3r/Print.cpp b/xs/src/libslic3r/Print.cpp
index 8c91eb192..bc403afb6 100644
--- a/xs/src/libslic3r/Print.cpp
+++ b/xs/src/libslic3r/Print.cpp
@@ -167,7 +167,10 @@ bool Print::invalidate_state_by_config_options(const std::vector<t_config_option
         "use_relative_e_distances",
         "use_volumetric_e",
         "variable_layer_height",
-        "wipe"
+        "wipe",
+        "wipe_tower_x",
+        "wipe_tower_y",
+        "wipe_tower_rotation_angle"
     };
 
     std::vector<PrintStep> steps;
@@ -176,7 +179,12 @@ bool Print::invalidate_state_by_config_options(const std::vector<t_config_option
 
     // Always invalidate the wipe tower. This is probably necessary because of the wipe_into_infill / wipe_into_objects
     // features - nearly anything can influence what should (and could) be wiped into.
-    steps.emplace_back(psWipeTower);
+    // Only these three parameters don't invalidate the wipe tower (they only affect the gcode export):
+    for (const t_config_option_key &opt_key : opt_keys)
+        if (opt_key != "wipe_tower_x" && opt_key != "wipe_tower_y" && opt_key != "wipe_tower_rotation_angle") {
+            steps.emplace_back(psWipeTower);
+            break;
+        }
 
     for (const t_config_option_key &opt_key : opt_keys) {
         if (steps_ignore.find(opt_key) != steps_ignore.end()) {
@@ -213,10 +221,7 @@ bool Print::invalidate_state_by_config_options(const std::vector<t_config_option
             || opt_key == "spiral_vase"
             || opt_key == "temperature"
             || opt_key == "wipe_tower"
-            || opt_key == "wipe_tower_x"
-            || opt_key == "wipe_tower_y"
             || opt_key == "wipe_tower_width"
-            || opt_key == "wipe_tower_rotation_angle"
             || opt_key == "wipe_tower_bridging"
             || opt_key == "wiping_volumes_matrix"
             || opt_key == "parking_pos_retraction"
@@ -1052,6 +1057,8 @@ void Print::_make_wipe_tower()
     if (! this->has_wipe_tower())
         return;
 
+    m_wipe_tower_depth = 0.f;
+
     // Get wiping matrix to get number of extruders and convert vector<double> to vector<float>:
     std::vector<float> wiping_matrix((this->config.wiping_volumes_matrix.values).begin(),(this->config.wiping_volumes_matrix.values).end());
     // Extract purging volumes for each extruder pair:
@@ -1163,7 +1170,8 @@ void Print::_make_wipe_tower()
     // Generate the wipe tower layers.
     m_wipe_tower_tool_changes.reserve(m_tool_ordering.layer_tools().size());
     wipe_tower.generate(m_wipe_tower_tool_changes);
-    
+    m_wipe_tower_depth = wipe_tower.get_depth();
+
     // Unload the current filament over the purge tower.
     coordf_t layer_height = this->objects.front()->config.layer_height.value;
     if (m_tool_ordering.back().wipe_tower_partitions > 0) {
diff --git a/xs/src/libslic3r/Print.hpp b/xs/src/libslic3r/Print.hpp
index bcd61ea02..e3430ad0e 100644
--- a/xs/src/libslic3r/Print.hpp
+++ b/xs/src/libslic3r/Print.hpp
@@ -273,6 +273,7 @@ public:
     
     void add_model_object(ModelObject* model_object, int idx = -1);
     bool apply_config(DynamicPrintConfig config);
+    float get_wipe_tower_depth() const { return m_wipe_tower_depth; }
     bool has_infinite_skirt() const;
     bool has_skirt() const;
     // Returns an empty string if valid, otherwise returns an error message.
@@ -326,6 +327,9 @@ private:
     bool invalidate_state_by_config_options(const std::vector<t_config_option_key> &opt_keys);
     PrintRegionConfig _region_config_from_model_volume(const ModelVolume &volume);
 
+    // Depth of the wipe tower to pass to GLCanvas3D for exact bounding box:
+    float m_wipe_tower_depth = 0.f;
+
     // Has the calculation been canceled?
     tbb::atomic<bool>   m_canceled;
 };
diff --git a/xs/src/libslic3r/PrintObject.cpp b/xs/src/libslic3r/PrintObject.cpp
index 47495dad8..7150ead59 100644
--- a/xs/src/libslic3r/PrintObject.cpp
+++ b/xs/src/libslic3r/PrintObject.cpp
@@ -75,6 +75,7 @@ bool PrintObject::delete_last_copy()
 
 bool PrintObject::set_copies(const Points &points)
 {
+    bool copies_num_changed = this->_copies.size() != points.size();
     this->_copies = points;
     
     // order copies with a nearest neighbor search and translate them by _copies_shift
@@ -93,7 +94,8 @@ bool PrintObject::set_copies(const Points &points)
     
     bool invalidated = this->_print->invalidate_step(psSkirt);
     invalidated |= this->_print->invalidate_step(psBrim);
-    invalidated |= this->_print->invalidate_step(psWipeTower);
+    if (copies_num_changed)
+        invalidated |= this->_print->invalidate_step(psWipeTower);
     return invalidated;
 }
 
diff --git a/xs/src/slic3r/GUI/3DScene.cpp b/xs/src/slic3r/GUI/3DScene.cpp
index 6ec339153..33b3768ed 100644
--- a/xs/src/slic3r/GUI/3DScene.cpp
+++ b/xs/src/slic3r/GUI/3DScene.cpp
@@ -644,20 +644,62 @@ std::vector<int> GLVolumeCollection::load_object(
     return volumes_idx; 
 }
 
+
 int GLVolumeCollection::load_wipe_tower_preview(
-    int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool use_VBOs)
+    int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool use_VBOs, bool size_unknown, float brim_width)
 {
-    float color[4] = { 0.5f, 0.5f, 0.0f, 0.5f };
-    this->volumes.emplace_back(new GLVolume(color));
-    GLVolume &v = *this->volumes.back();
-
+    if (depth < 0.01f)
+        return int(this->volumes.size() - 1);
     if (height == 0.0f)
         height = 0.1f;
-
-    auto mesh = make_cube(width, depth, height);
-    mesh.translate(-width / 2.f, -depth / 2.f, 0.f);
     Point origin_of_rotation(0.f, 0.f);
-    mesh.rotate(rotation_angle,&origin_of_rotation);
+    TriangleMesh mesh;
+    float color[4] = { 0.5f, 0.5f, 0.0f, 1.f };
+
+    // In case we don't know precise dimensions of the wipe tower yet, we'll draw the box with different color with one side jagged:
+    if (size_unknown) {
+        color[0] = 0.9f;
+        color[1] = 0.6f;
+
+        depth = std::max(depth, 10.f); // Too narrow tower would interfere with the teeth. The estimate is not precise anyway.
+        float min_width = 30.f;
+        // We'll now create the box with jagged edge. y-coordinates of the pre-generated model are shifted so that the front
+        // edge has y=0 and centerline of the back edge has y=depth:
+        Pointf3s points;
+        std::vector<Point3> facets;
+        float out_points_idx[][3] = {{0, -depth, 0}, {0, 0, 0}, {38.453, 0, 0}, {61.547, 0, 0}, {100, 0, 0}, {100, -depth, 0}, {55.7735, -10, 0}, {44.2265, 10, 0},
+                                     {38.453, 0, 1}, {0, 0, 1}, {0, -depth, 1}, {100, -depth, 1}, {100, 0, 1}, {61.547, 0, 1}, {55.7735, -10, 1}, {44.2265, 10, 1}};
+        int out_facets_idx[][3] = {{0, 1, 2}, {3, 4, 5}, {6, 5, 0}, {3, 5, 6}, {6, 2, 7}, {6, 0, 2}, {8, 9, 10}, {11, 12, 13}, {10, 11, 14}, {14, 11, 13}, {15, 8, 14},
+                                   {8, 10, 14}, {3, 12, 4}, {3, 13, 12}, {6, 13, 3}, {6, 14, 13}, {7, 14, 6}, {7, 15, 14}, {2, 15, 7}, {2, 8, 15}, {1, 8, 2}, {1, 9, 8},
+                                   {0, 9, 1}, {0, 10, 9}, {5, 10, 0}, {5, 11, 10}, {4, 11, 5}, {4, 12, 11}};
+        for (int i=0;i<16;++i)
+            points.push_back(Pointf3(out_points_idx[i][0] / (100.f/min_width), out_points_idx[i][1] + depth, out_points_idx[i][2]));
+        for (int i=0;i<28;++i)
+            facets.push_back(Point3(out_facets_idx[i][0], out_facets_idx[i][1], out_facets_idx[i][2]));
+        TriangleMesh tooth_mesh(points, facets);
+
+        // We have the mesh ready. It has one tooth and width of min_width. We will now append several of these together until we are close to
+        // the required width of the block. Than we can scale it precisely.
+        size_t n = std::max(1, int(width/min_width)); // How many shall be merged?
+        for (size_t i=0;i<n;++i) {
+            mesh.merge(tooth_mesh);
+            tooth_mesh.translate(min_width, 0.f, 0.f);
+        }
+
+        mesh.scale(Pointf3(width/(n*min_width), 1.f, height)); // Scaling to proper width
+    }
+    else
+        mesh = make_cube(width, depth, height);
+
+    // We'll make another mesh to show the brim (fixed layer height):
+    TriangleMesh brim_mesh = make_cube(width+2.f*brim_width, depth+2.f*brim_width, 0.2f);
+    brim_mesh.translate(-brim_width, -brim_width, 0.f);
+    mesh.merge(brim_mesh);
+
+    mesh.rotate(rotation_angle, &origin_of_rotation); // rotates the box according to the config rotation setting
+
+    this->volumes.emplace_back(new GLVolume(color));
+    GLVolume &v = *this->volumes.back();
 
     if (use_VBOs)
         v.indexed_vertex_array.load_mesh_full_shading(mesh);
diff --git a/xs/src/slic3r/GUI/3DScene.hpp b/xs/src/slic3r/GUI/3DScene.hpp
index a2050e5a1..a552b32a7 100644
--- a/xs/src/slic3r/GUI/3DScene.hpp
+++ b/xs/src/slic3r/GUI/3DScene.hpp
@@ -401,7 +401,7 @@ public:
         bool                     use_VBOs);
 
     int load_wipe_tower_preview(
-        int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool use_VBOs);
+        int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool use_VBOs, bool size_unknown, float brim_width);
 
     // Render the volumes by OpenGL.
     void render_VBOs() const;
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index 1c73a69b8..a631c13bb 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -2314,7 +2314,12 @@ void GLCanvas3D::reload_scene(bool force)
             float w = dynamic_cast<const ConfigOptionFloat*>(m_config->option("wipe_tower_width"))->value;
             float a = dynamic_cast<const ConfigOptionFloat*>(m_config->option("wipe_tower_rotation_angle"))->value;
 
-            m_volumes.load_wipe_tower_preview(1000, x, y, w, 15.0f * (float)(extruders_count - 1), (float)height, a, m_use_VBOs && m_initialized);
+            float depth = m_print->get_wipe_tower_depth();
+            if (!m_print->state.is_done(psWipeTower))
+                depth = (900.f/w) * (float)(extruders_count - 1) ;
+
+            m_volumes.load_wipe_tower_preview(1000, x, y, w, depth, (float)height, a, m_use_VBOs && m_initialized, !m_print->state.is_done(psWipeTower),
+                                              m_print->config.nozzle_diameter.values[0] * 1.25f * 4.5f);
         }
     }
 
@@ -4063,6 +4068,8 @@ void GLCanvas3D::_load_wipe_tower_toolpaths(const std::vector<std::string>& str_
     {
         const Print                 *print;
         const std::vector<float>    *tool_colors;
+        WipeTower::xy                wipe_tower_pos;
+        float                        wipe_tower_angle;
 
         // Number of vertices (each vertex is 6x4=24 bytes long)
         static const size_t          alloc_size_max() { return 131072; } // 3.15MB
@@ -4095,6 +4102,9 @@ void GLCanvas3D::_load_wipe_tower_toolpaths(const std::vector<std::string>& str_
     if (m_print->m_wipe_tower_final_purge)
         ctxt.final.emplace_back(*m_print->m_wipe_tower_final_purge.get());
 
+    ctxt.wipe_tower_angle = ctxt.print->config.wipe_tower_rotation_angle.value/180.f * M_PI;
+    ctxt.wipe_tower_pos = WipeTower::xy(ctxt.print->config.wipe_tower_x.value, ctxt.print->config.wipe_tower_y.value);
+
     BOOST_LOG_TRIVIAL(debug) << "Loading wipe tower toolpaths in parallel - start";
 
     //FIXME Improve the heuristics for a grain size.
@@ -4152,12 +4162,25 @@ void GLCanvas3D::_load_wipe_tower_toolpaths(const std::vector<std::string>& str_
                     lines.reserve(n_lines);
                     widths.reserve(n_lines);
                     heights.assign(n_lines, extrusions.layer_height);
+                    WipeTower::Extrusion e_prev = extrusions.extrusions[i-1];
+
+                    if (!extrusions.priming) { // wipe tower extrusions describe the wipe tower at the origin with no rotation
+                        e_prev.pos.rotate(ctxt.wipe_tower_angle);
+                        e_prev.pos.translate(ctxt.wipe_tower_pos);
+                    }
+
                     for (; i < j; ++i) {
-                        const WipeTower::Extrusion &e = extrusions.extrusions[i];
+                        WipeTower::Extrusion e = extrusions.extrusions[i];
                         assert(e.width > 0.f);
-                        const WipeTower::Extrusion &e_prev = *(&e - 1);
+                        if (!extrusions.priming) {
+                            e.pos.rotate(ctxt.wipe_tower_angle);
+                            e.pos.translate(ctxt.wipe_tower_pos);
+                        }
+
                         lines.emplace_back(Point::new_scale(e_prev.pos.x, e_prev.pos.y), Point::new_scale(e.pos.x, e.pos.y));
                         widths.emplace_back(e.width);
+
+                        e_prev = e;
                     }
                     _3DScene::thick_lines_to_verts(lines, widths, heights, lines.front().a == lines.back().b, extrusions.print_z,
                         *vols[ctxt.volume_idx(e.tool, 0)]);
@@ -4716,8 +4739,11 @@ void GLCanvas3D::_load_shells()
     const PrintConfig& config = m_print->config;
     unsigned int extruders_count = config.nozzle_diameter.size();
     if ((extruders_count > 1) && config.single_extruder_multi_material && config.wipe_tower && !config.complete_objects) {
-        const float width_per_extruder = 15.0f; // a simple workaround after wipe_tower_per_color_wipe got obsolete
-        m_volumes.load_wipe_tower_preview(1000, config.wipe_tower_x, config.wipe_tower_y, config.wipe_tower_width, width_per_extruder * (extruders_count - 1), max_z, config.wipe_tower_rotation_angle, m_use_VBOs && m_initialized);
+        float depth = m_print->get_wipe_tower_depth();
+        if (!m_print->state.is_done(psWipeTower))
+            depth = (900.f/config.wipe_tower_width) * (float)(extruders_count - 1) ;
+        m_volumes.load_wipe_tower_preview(1000, config.wipe_tower_x, config.wipe_tower_y, config.wipe_tower_width, depth, max_z, config.wipe_tower_rotation_angle,
+                                          m_use_VBOs && m_initialized, !m_print->state.is_done(psWipeTower), m_print->config.nozzle_diameter.values[0] * 1.25f * 4.5f);
     }
 }
 
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 9c62fe8eb..8f3c8144c 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -903,6 +903,7 @@ void add_frequently_changed_parameters(wxWindow* parent, wxBoxSizer* sizer, wxFl
                     std::vector<float> extruders = dlg.get_extruders();
                     (config.option<ConfigOptionFloats>("wiping_volumes_matrix"))->values = std::vector<double>(matrix.begin(),matrix.end());
                     (config.option<ConfigOptionFloats>("wiping_volumes_extruders"))->values = std::vector<double>(extruders.begin(),extruders.end());
+                    g_on_request_update_callback.call();
                 }
 			}));
 			return sizer;
@@ -919,6 +920,10 @@ ConfigOptionsGroup* get_optgroup()
 	return m_optgroup.get();
 }
 
+void register_on_request_update_callback(void* callback) {
+    if (callback != nullptr)
+        g_on_request_update_callback.register_callback(callback);
+}
 
 wxButton* get_wiping_dialog_button()
 {
diff --git a/xs/src/slic3r/GUI/GUI.hpp b/xs/src/slic3r/GUI/GUI.hpp
index efb11b7df..c41ba2521 100644
--- a/xs/src/slic3r/GUI/GUI.hpp
+++ b/xs/src/slic3r/GUI/GUI.hpp
@@ -4,6 +4,7 @@
 #include <string>
 #include <vector>
 #include "Config.hpp"
+#include "../../libslic3r/Utils.hpp"
 
 #include <wx/intl.h>
 #include <wx/string.h>
@@ -171,6 +172,9 @@ wxString	from_u8(const std::string &str);
 
 void add_frequently_changed_parameters(wxWindow* parent, wxBoxSizer* sizer, wxFlexGridSizer* preset_sizer);
 
+static PerlCallback g_on_request_update_callback;
+void register_on_request_update_callback(void* callback);
+ 
 ConfigOptionsGroup* get_optgroup();
 wxButton*			get_wiping_dialog_button();
 
diff --git a/xs/xsp/GUI.xsp b/xs/xsp/GUI.xsp
index 6b05e9a67..7872abc80 100644
--- a/xs/xsp/GUI.xsp
+++ b/xs/xsp/GUI.xsp
@@ -104,3 +104,12 @@ void fix_model_by_win10_sdk_gui(ModelObject *model_object_src, Print *print, Mod
 
 void set_3DScene(SV *scene)
     %code%{ Slic3r::GUI::set_3DScene((_3DScene *)wxPli_sv_2_object(aTHX_ scene, "Slic3r::Model::3DScene") ); %};
+
+%package{Slic3r::_GUI};
+%{
+void
+register_on_request_update_callback(callback)
+        SV *callback;
+    CODE:
+        Slic3r::GUI::register_on_request_update_callback((void*)callback);
+%}
diff --git a/xs/xsp/GUI_3DScene.xsp b/xs/xsp/GUI_3DScene.xsp
index a91f32d29..0e0a03f5e 100644
--- a/xs/xsp/GUI_3DScene.xsp
+++ b/xs/xsp/GUI_3DScene.xsp
@@ -89,7 +89,7 @@
 
     std::vector<int> load_object(ModelObject *object, int obj_idx, std::vector<int> instance_idxs, std::string color_by, std::string select_by, std::string drag_by, bool use_VBOs);
 
-    int load_wipe_tower_preview(int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool use_VBOs);
+    int load_wipe_tower_preview(int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool use_VBOs, bool size_unknown, float brim_width);
 
     void erase()
         %code{% THIS->clear(); %};