ENH: Cancel the ramming for the last layer

if it exceeds the print height

jira: none
Change-Id: I427d6a0718f2a65ab2e59af448ee1a613c488596

src/libslic3r/GCode/WipeTower.cpp

@@ -1516,7 +1516,8 @@ WipeTower::WipeTower(const PrintConfig& config, int plate_idx, Vec3d plate_origi
     m_used_fillet(config.prime_tower_fillet_wall.value),
     m_extra_spacing((float)config.prime_tower_infill_gap.value/100.f),
     m_tower_framework(config.prime_tower_enable_framework.value),
-    m_max_speed((float)config.prime_tower_max_speed.value*60.f)
+    m_max_speed((float)config.prime_tower_max_speed.value*60.f),
+    m_printable_height(config.extruder_printable_height.values)
 {
     // Read absolute value of first layer speed, if given as percentage,
     // it is taken over following default. Speeds from config are not
@@ -1560,6 +1561,7 @@ WipeTower::WipeTower(const PrintConfig& config, int plate_idx, Vec3d plate_origi
                   ? Vec2f(bed_points.front().x(), bed_points.front().y())
                   : Vec2f::Zero();
     flat_ironing      = config.nozzle_diameter.values.size() > 1;//Only used for dual extrusion
+    m_last_layer_id.resize(config.nozzle_diameter.size(), -1);
 }
 
 
@@ -2789,6 +2791,8 @@ WipeTower::ToolChangeResult WipeTower::tool_change_new(size_t new_tool, bool sol
 {
     m_nozzle_change_result.gcode.clear();
     if (!m_filament_map.empty() && new_tool < m_filament_map.size() && m_filament_map[m_current_tool] != m_filament_map[new_tool]) {
+        //If it is the last layer and exceeds the printable height, cancel ramming
+        if (is_valid_last_layer(m_current_tool))
             m_nozzle_change_result = nozzle_change_new(m_current_tool, new_tool, solid_nozzlechange);
     }
 
@@ -3593,6 +3597,18 @@ void WipeTower::reset_block_status()
         block.last_nozzle_change_id   = -1;
     }
 }
+void WipeTower::set_nozzle_last_layer_id()
+{
+    for (int idx = 0; idx < m_plan.size(); idx++) {
+        auto &info = m_plan[idx];
+        for(int i =0 ; i<info.tool_changes.size();i++) {
+            int old_tool = info.tool_changes[i].old_tool;
+            int new_tool = info.tool_changes[i].new_tool;
+            if (old_tool >= 0) m_last_layer_id[m_filament_map[old_tool] - 1] = idx;
+            m_last_layer_id[m_filament_map[new_tool] - 1] = idx;
+        }
+    }
+}
 
 void WipeTower::update_all_layer_depth(float wipe_tower_depth)
 {
@@ -3804,6 +3820,7 @@ void WipeTower::plan_tower_new()
     }
 
     update_all_layer_depth(max_depth);
+    set_nozzle_last_layer_id();
     m_rib_length = std::max({m_rib_length, sqrt(m_wipe_tower_depth * m_wipe_tower_depth + m_wipe_tower_width * m_wipe_tower_width)});
     m_rib_length += m_extra_rib_length;
     m_rib_length = std::max(0.f, m_rib_length);
@@ -3896,9 +3913,7 @@ void WipeTower::generate_new(std::vector<std::vector<WipeTower::ToolChangeResult
         reset_block_status();
         m_cur_layer_id = index++;
         set_layer(layer.z, layer.height, 0, false, layer.z == m_plan.back().z);
-
         if (m_layer_info->depth < m_perimeter_width) continue;
-
         if (m_wipe_tower_blocks.size() == 1) {
             if (m_layer_info->depth < m_wipe_tower_depth - m_perimeter_width) {
                 // align y shift to perimeter width
@@ -3920,9 +3935,9 @@ void WipeTower::generate_new(std::vector<std::vector<WipeTower::ToolChangeResult
             int candidate_id = -1;
             for (size_t idx = 0; idx < layer.tool_changes.size(); ++idx) {
                 if (idx == 0) {
-                    if (layer.tool_changes[idx].old_tool == wall_filament)
+                    if (layer.tool_changes[idx].old_tool == wall_filament && is_valid_last_layer(layer.tool_changes[idx].old_tool))
                         return wall_filament;
-                    else if (m_filpar[layer.tool_changes[idx].old_tool].category == m_filpar[wall_filament].category) {
+                    else if (m_filpar[layer.tool_changes[idx].old_tool].category == m_filpar[wall_filament].category &&is_valid_last_layer(layer.tool_changes[idx].old_tool)) {
                         candidate_id = layer.tool_changes[idx].old_tool;
                     }
                 }
@@ -4020,7 +4035,8 @@ void WipeTower::generate_new(std::vector<std::vector<WipeTower::ToolChangeResult
                 if (finish_layer_filament == -1) {
                     finish_layer_filament = wall_idx;
                 }
-
+                // Cancel the block of the last layer
+                if (!is_valid_last_layer(finish_layer_filament)) continue;
                 ToolChangeResult finish_block_tcr;
                 if (interface_solid || (block.solid_infill[m_cur_layer_id] && block.filament_adhesiveness_category != m_filament_categories[finish_layer_filament])) {
                     interface_solid  = interface_solid && !((block.solid_infill[m_cur_layer_id] && block.filament_adhesiveness_category != m_filament_categories[finish_layer_filament]));//noly reduce speed when
@@ -4476,4 +4492,11 @@ bool WipeTower::need_thick_bridge_flow(float pos_y) const {
     return false;
 }
 
+bool WipeTower::is_valid_last_layer(int tool) const
+{
+    int nozzle_id = m_filament_map[tool]-1;
+    if (tool >= 0 && tool < m_filament_map.size() && m_last_layer_id[nozzle_id]==m_cur_layer_id && m_z_pos > m_printable_height[nozzle_id]) return false;
+    return true;
+}
+
 } // namespace Slic3r

src/libslic3r/GCode/WipeTower.hpp

@@ -240,7 +240,6 @@ public:
 
 		// Calculate extrusion flow from desired line width, nozzle diameter, filament diameter and layer_height:
 		m_extrusion_flow = extrusion_flow(layer_height);
-
         // Advance m_layer_info iterator, making sure we got it right
 		while (!m_plan.empty() && m_layer_info->z < print_z - WT_EPSILON && m_layer_info+1 != m_plan.end())
 			++m_layer_info;
@@ -390,6 +389,7 @@ public:
 	void plan_tower_new();
 	void generate_wipe_tower_blocks();
     void update_all_layer_depth(float wipe_tower_depth);
+    void set_nozzle_last_layer_id();
 
     ToolChangeResult   tool_change_new(size_t new_tool, bool solid_change = false, bool solid_nozzlechange=false);
     NozzleChangeResult nozzle_change_new(int old_filament_id, int new_filament_id, bool solid_change = false);
@@ -431,7 +431,7 @@ private:
     float  m_travel_speed       = 0.f;
     float  m_first_layer_speed  = 0.f;
     size_t m_first_layer_idx    = size_t(-1);
-
+    std::vector<int>    m_last_layer_id;
     std::vector<double> m_filaments_change_length;
     size_t       m_cur_layer_id;
     NozzleChangeResult m_nozzle_change_result;
@@ -497,7 +497,9 @@ private:
     float           m_max_speed = 5400.f;  // the maximum printing speed on the prime tower.
     std::vector<Vec2f> m_wall_skip_points;
     std::map<float,Polylines> m_outer_wall;
+    std::vector<double>        m_printable_height;
     bool is_first_layer() const { return size_t(m_layer_info - m_plan.begin()) == m_first_layer_idx; }
+    bool                       is_valid_last_layer(int tool) const;
 
 	// Calculates length of extrusion line to extrude given volume
 	float volume_to_length(float volume, float line_width, float layer_height) const {