Wipe tower: remove a move to the wipe tower when not needed

src/libslic3r/GCode.cpp

@@ -238,8 +238,9 @@ namespace Slic3r {
 
         std::string tcr_rotated_gcode = post_process_wipe_tower_moves(tcr, wipe_tower_offset, wipe_tower_rotation);
 
-        if (! tcr.priming) {
-            // Move over the wipe tower.
+        if (gcodegen.config().single_extruder_multi_material && ! tcr.priming) {
+            // Move over the wipe tower. If this is not single-extruder MM, the first wipe tower move following the
+            // toolchange will travel there anyway.
             gcode += gcodegen.retract();
             gcodegen.m_avoid_crossing_perimeters.use_external_mp_once();
             gcode += gcodegen.travel_to(

src/libslic3r/GCode/WipeTower.cpp

@@ -71,6 +71,8 @@ public:
 		return *this;
 	}
 
+    WipeTowerWriter& 			 set_position(const Vec2f &pos) { m_current_pos = pos; return *this; }
+
     WipeTowerWriter&				 set_initial_tool(size_t tool) { m_current_tool = tool; return *this; }
 
 	WipeTowerWriter&				 set_z(float z) 
@@ -802,19 +804,24 @@ void WipeTower::toolchange_Unload(
 {
 	float xl = cleaning_box.ld.x() + 1.f * m_perimeter_width;
 	float xr = cleaning_box.rd.x() - 1.f * m_perimeter_width;
-	
-	const float line_width = m_perimeter_width * m_filpar[m_current_tool].ramming_line_width_multiplicator;       // desired ramming line thickness
+
+    const float line_width = m_perimeter_width * m_filpar[m_current_tool].ramming_line_width_multiplicator;       // desired ramming line thickness
 	const float y_step = line_width * m_filpar[m_current_tool].ramming_step_multiplicator * m_extra_spacing; // spacing between lines in mm
 
+    const Vec2f ramming_start_pos = Vec2f(xl, cleaning_box.ld.y() + m_depth_traversed + y_step/2.f);
+
     writer.append("; CP TOOLCHANGE UNLOAD\n")
         .change_analyzer_line_width(line_width);
 
 	unsigned i = 0;										// iterates through ramming_speed
 	m_left_to_right = true;								// current direction of ramming
 	float remaining = xr - xl ;							// keeps track of distance to the next turnaround
-	float e_done = 0;									// measures E move done from each segment
+	float e_done = 0;									// measures E move done from each segment   
 
-	writer.travel(xl, cleaning_box.ld.y() + m_depth_traversed + y_step/2.f ); // move to starting position
+    if (m_semm)
+        writer.travel(ramming_start_pos); // move to starting position
+    else
+        writer.set_position(ramming_start_pos);
 
     // if the ending point of the ram would end up in mid air, align it with the end of the wipe tower:
     if (m_layer_info > m_plan.begin() && m_layer_info < m_plan.end() && (m_layer_info-1!=m_plan.begin() || !m_adhesion )) {
@@ -849,7 +856,7 @@ void WipeTower::toolchange_Unload(
     writer.disable_linear_advance();
 
     // now the ramming itself:
-    while (i < m_filpar[m_current_tool].ramming_speed.size())
+    while (m_semm && i < m_filpar[m_current_tool].ramming_speed.size())
     {
         const float x = volume_to_length(m_filpar[m_current_tool].ramming_speed[i] * 0.25f, line_width, m_layer_height);
         const float e = m_filpar[m_current_tool].ramming_speed[i] * 0.25f / filament_area(); // transform volume per sec to E move;
@@ -898,7 +905,7 @@ void WipeTower::toolchange_Unload(
 
     // Cooling:
     const int& number_of_moves = m_filpar[m_current_tool].cooling_moves;
-    if (number_of_moves > 0) {
+    if (m_semm && number_of_moves > 0) {
         const float& initial_speed = m_filpar[m_current_tool].cooling_initial_speed;
         const float& final_speed   = m_filpar[m_current_tool].cooling_final_speed;
 
@@ -916,14 +923,20 @@ void WipeTower::toolchange_Unload(
         }
     }
 
-    // let's wait is necessary:
-    writer.wait(m_filpar[m_current_tool].delay);
-    // we should be at the beginning of the cooling tube again - let's move to parking position:
-    writer.retract(-m_cooling_tube_length/2.f+m_parking_pos_retraction-m_cooling_tube_retraction, 2000);
+    if (m_semm) {
+        // let's wait is necessary:
+        writer.wait(m_filpar[m_current_tool].delay);
+        // we should be at the beginning of the cooling tube again - let's move to parking position:
+        writer.retract(-m_cooling_tube_length/2.f+m_parking_pos_retraction-m_cooling_tube_retraction, 2000);
+    }
 
 	// this is to align ramming and future wiping extrusions, so the future y-steps can be uniform from the start:
     // the perimeter_width will later be subtracted, it is there to not load while moving over just extruded material
-	writer.travel(end_of_ramming.x(), end_of_ramming.y() + (y_step/m_extra_spacing-m_perimeter_width) / 2.f + m_perimeter_width, 2400.f);
+    Vec2f pos = Vec2f(end_of_ramming.x(), end_of_ramming.y() + (y_step/m_extra_spacing-m_perimeter_width) / 2.f + m_perimeter_width);
+	if (m_semm)
+        writer.travel(pos, 2400.f);
+    else
+        writer.set_position(pos);
 
 	writer.resume_preview()
 		  .flush_planner_queue();

src/libslic3r/GCode/WipeTower.hpp

@@ -290,7 +290,6 @@ private:
 	// Extruder specific parameters.
     std::vector<FilamentParameters> m_filpar;
 
-
 	// State of the wipe tower generator.
 	unsigned int m_num_layer_changes = 0; // Layer change counter for the output statistics.
 	unsigned int m_num_tool_changes  = 0; // Tool change change counter for the output statistics.