Internal Bridge Flow rate parameter introduction

Updated internal bridging flow change and reverted bridge PR (SoftFever#2943)

Updated internal bridging flow change & reverted bridge PR

(cherry picked from commit ae9a2d5)
Internal Bridge Flow rate parameter introduction (SoftFever#2859)

* Internal Bridge Flow rate parameter introduction

* updated incorrect capitalisation

* Updated parameter ordering

(cherry picked from commit ce9a8d7)

src/libslic3r/GCode.cpp

@@ -4588,6 +4588,8 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
         _mm3_per_mm *= m_config.top_solid_infill_flow_ratio;
     else if (path.role() == erBottomSurface)
         _mm3_per_mm *= m_config.bottom_solid_infill_flow_ratio;
+    else if (path.role() == erInternalBridgeInfill)
+        _mm3_per_mm *= m_config.internal_bridge_flow;
 
 
     double e_per_mm = m_writer.extruder()->e_per_mm3() * _mm3_per_mm;

src/libslic3r/Preset.cpp

@@ -749,7 +749,7 @@ static std::vector<std::string> s_Preset_print_options {
     "sparse_infill_filament", "solid_infill_filament", "support_filament", "support_interface_filament",
     "ooze_prevention", "standby_temperature_delta", "interface_shells", "line_width", "initial_layer_line_width",
     "inner_wall_line_width", "outer_wall_line_width", "sparse_infill_line_width", "internal_solid_infill_line_width",
-    "top_surface_line_width", "support_line_width", "infill_wall_overlap", "bridge_flow",
+    "top_surface_line_width", "support_line_width", "infill_wall_overlap", "bridge_flow", "internal_bridge_flow",
     "elefant_foot_compensation", "elefant_foot_compensation_layers", "xy_contour_compensation", "xy_hole_compensation", "resolution", "enable_prime_tower",
     "prime_tower_width", "prime_tower_brim_width", "prime_volume",
     "wipe_tower_no_sparse_layers", "compatible_printers", "compatible_printers_condition", "inherits",

src/libslic3r/PrintConfig.cpp

@@ -776,6 +776,15 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloat(1));
 
+    def = this->add("internal_bridge_flow", coFloat);
+    def->label = L("Internal bridge flow");
+    def->category = L("Quality");
+    def->tooltip = L("This value governs the thickness of the internal bridge layer. This is the first layer over sparse infill. Decrease this value slightly (for example 0.9) to improve surface quality over sparse infill.");
+    def->min = 0;
+    def->max = 2.0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloat(1));
+
     def = this->add("top_solid_infill_flow_ratio", coFloat);
     def->label = L("Top surface flow ratio");
     def->category = L("Advanced");
@@ -5702,6 +5711,11 @@ std::map<std::string, std::string> validate(const FullPrintConfig &cfg, bool und
     if (cfg.bridge_flow <= 0) {
         error_message.emplace("bridge_flow", L("invalid value ") + std::to_string(cfg.bridge_flow));
     }
+
+    // --bridge-flow-ratio
+    if (cfg.bridge_flow <= 0) {
+        error_message.emplace("internal_bridge_flow", L("invalid value ") + std::to_string(cfg.internal_bridge_flow));
+    }
 
     // extruder clearance
     if (cfg.extruder_clearance_radius <= 0) {

src/libslic3r/PrintConfig.hpp

@@ -796,6 +796,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,                bottom_shell_thickness))
     ((ConfigOptionFloat,                bridge_angle))
     ((ConfigOptionFloat,                bridge_flow))
+    ((ConfigOptionFloat,                internal_bridge_flow))
     ((ConfigOptionFloat,                bridge_speed))
     ((ConfigOptionFloatOrPercent,       internal_bridge_speed))
     ((ConfigOptionBool,                 ensure_vertical_shell_thickness))

src/libslic3r/PrintObject.cpp

@@ -1105,7 +1105,7 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "overhang_speed_classic") {
             steps.emplace_back(posPerimeters);
             steps.emplace_back(posSupportMaterial);
-        } else if (opt_key == "bridge_flow") {
+        } else if (opt_key == "bridge_flow" || opt_key == "internal_bridge_flow") {
             if (m_config.support_top_z_distance > 0.) {
             	// Only invalidate due to bridging if bridging is enabled.
             	// If later "support_top_z_distance" is modified, the complete PrintObject is invalidated anyway.

src/slic3r/GUI/Tab.cpp

@@ -1896,6 +1896,7 @@ void TabPrint::build()
         optgroup->append_single_option_line("wall_infill_order");
         optgroup->append_single_option_line("print_flow_ratio");
         optgroup->append_single_option_line("bridge_flow");
+	optgroup->append_single_option_line("internal_bridge_flow");
         optgroup->append_single_option_line("bridge_density");
         optgroup->append_single_option_line("thick_bridges");
         optgroup->append_single_option_line("top_solid_infill_flow_ratio");