Enhancement: ERS - Option to limit ERS to external perimeters and overhangs only (#7399)

* Option to limit ERS to external perimeters and overhangs only

* Label name

* Label update

* Merge branch 'main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'SoftFever:main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'SoftFever:main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'SoftFever:main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'SoftFever:main' into Limit-ERS-to-external-perimeters-and-overhangs

* Merge branch 'main' into Limit-ERS-to-external-perimeters-and-overhangs

src/libslic3r/GCode/PressureEqualizer.cpp

@@ -62,6 +62,7 @@ PressureEqualizer::PressureEqualizer(const Slic3r::GCodeConfig &config) : m_use_
 		m_max_volumetric_extrusion_rate_slope_positive = float(config.max_volumetric_extrusion_rate_slope.value) * 60.f * 60.f;
     	m_max_volumetric_extrusion_rate_slope_negative = float(config.max_volumetric_extrusion_rate_slope.value) * 60.f * 60.f;
     	m_max_segment_length = float(config.max_volumetric_extrusion_rate_slope_segment_length.value);
+        m_extrusion_rate_smoothing_external_perimeter_only = bool(config.extrusion_rate_smoothing_external_perimeter_only.value);
     }
 
     for (ExtrusionRateSlope &extrusion_rate_slope : m_max_volumetric_extrusion_rate_slopes) {
@@ -629,7 +630,9 @@ void PressureEqualizer::adjust_volumetric_rate(const size_t fist_line_idx, const
                 rate_end = rate_succ;
 
             // don't alter the flow rate for these extrusion types
-            if (!line.adjustable_flow || line.extrusion_role == ExtrusionRole::erBridgeInfill || line.extrusion_role == ExtrusionRole::erIroning) {
+            // Orca: Limit ERS to external perimeters and overhangs if option selected by user
+            if (!line.adjustable_flow || line.extrusion_role == ExtrusionRole::erBridgeInfill || line.extrusion_role == ExtrusionRole::erIroning ||
+                (m_extrusion_rate_smoothing_external_perimeter_only && line.extrusion_role != ExtrusionRole::erOverhangPerimeter && line.extrusion_role != ExtrusionRole::erExternalPerimeter)) {
                 rate_end = line.volumetric_extrusion_rate_end;
             } else if (line.volumetric_extrusion_rate_end > rate_end) {
                 line.volumetric_extrusion_rate_end = rate_end;
@@ -684,10 +687,13 @@ void PressureEqualizer::adjust_volumetric_rate(const size_t fist_line_idx, const
 
             float rate_start = feedrate_per_extrusion_role[iRole];
             // don't alter the flow rate for these extrusion types
-            if (!line.adjustable_flow  || line.extrusion_role == ExtrusionRole::erBridgeInfill || line.extrusion_role == ExtrusionRole::erIroning) {
+            // Orca: Limit ERS to external perimeters and overhangs if option selected by user
+            if (!line.adjustable_flow || line.extrusion_role == ExtrusionRole::erBridgeInfill || line.extrusion_role == ExtrusionRole::erIroning ||
+                (m_extrusion_rate_smoothing_external_perimeter_only && line.extrusion_role != ExtrusionRole::erOverhangPerimeter && line.extrusion_role != ExtrusionRole::erExternalPerimeter)) {
                 rate_start = line.volumetric_extrusion_rate_start;
             } else if (iRole == size_t(line.extrusion_role) && rate_prec < rate_start)
                 rate_start = rate_prec;
+            
             if (line.volumetric_extrusion_rate_start > rate_start) {
                 line.volumetric_extrusion_rate_start = rate_start;
                 line.max_volumetric_extrusion_rate_slope_positive = rate_slope;

src/libslic3r/GCode/PressureEqualizer.hpp

@@ -84,6 +84,9 @@ private:
 	// Smaller value means a smoother transition between two different flow rates.
     float                           m_max_segment_length;
     
+    // Apply ERS only on external perimeters and overhangs
+    bool                           m_extrusion_rate_smoothing_external_perimeter_only;
+
     // Indicate if extrude set speed block was opened using the tag ";_EXTRUDE_SET_SPEED"
     // or not (not opened, or it was closed using the tag ";_EXTRUDE_END").
     bool                            opened_extrude_set_speed_block = false;

src/libslic3r/Preset.cpp

@@ -770,7 +770,7 @@ static std::vector<std::string> s_Preset_print_options {
     "ironing_type", "ironing_pattern", "ironing_flow", "ironing_speed", "ironing_spacing", "ironing_angle",
     "max_travel_detour_distance",
     "fuzzy_skin", "fuzzy_skin_thickness", "fuzzy_skin_point_distance", "fuzzy_skin_first_layer",
-    "max_volumetric_extrusion_rate_slope", "max_volumetric_extrusion_rate_slope_segment_length",
+    "max_volumetric_extrusion_rate_slope", "max_volumetric_extrusion_rate_slope_segment_length","extrusion_rate_smoothing_external_perimeter_only",
     "inner_wall_speed", "outer_wall_speed", "sparse_infill_speed", "internal_solid_infill_speed",
     "top_surface_speed", "support_speed", "support_object_xy_distance", "support_interface_speed",
     "bridge_speed", "internal_bridge_speed", "gap_infill_speed", "travel_speed", "travel_speed_z", "initial_layer_speed",

src/libslic3r/Print.cpp

@@ -144,6 +144,7 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
         "slow_down_min_speed",
         "max_volumetric_extrusion_rate_slope",
         "max_volumetric_extrusion_rate_slope_segment_length",
+        "extrusion_rate_smoothing_external_perimeter_only",
         "reduce_infill_retraction",
         "filename_format",
         "retraction_minimum_travel",

src/libslic3r/PrintConfig.cpp

@@ -3356,6 +3356,13 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionInt(3));
     
+    def = this->add("extrusion_rate_smoothing_external_perimeter_only", coBool);
+    def->label = L("Apply only on external features");
+    def->tooltip = L("Applies extrusion rate smoothing only on external perimeters and overhangs. This can help reduce artefacts due to sharp speed transitions on externally visible "
+                     "overhangs without impacting the print speed of features that will not be visible to the user.");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
     def = this->add("fan_min_speed", coFloats);
     def->label = L("Fan speed");
     def->tooltip = L("Minimum speed for part cooling fan");

src/libslic3r/PrintConfig.hpp

@@ -1092,6 +1092,7 @@ PRINT_CONFIG_CLASS_DEFINE(
 
     ((ConfigOptionFloat,               max_volumetric_extrusion_rate_slope))
     ((ConfigOptionInt,               max_volumetric_extrusion_rate_slope_segment_length))
+    ((ConfigOptionBool,               extrusion_rate_smoothing_external_perimeter_only))
     
     ((ConfigOptionPercents,            retract_before_wipe))
     ((ConfigOptionFloats,              retraction_length))

src/slic3r/GUI/ConfigManipulation.cpp

@@ -497,6 +497,7 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig *config, co
     int have_volumetric_extrusion_rate_slope_segment_length = config->option<ConfigOptionInt>("max_volumetric_extrusion_rate_slope_segment_length")->value;
     toggle_field("enable_arc_fitting", !have_volumetric_extrusion_rate_slope);
     toggle_line("max_volumetric_extrusion_rate_slope_segment_length", have_volumetric_extrusion_rate_slope);
+    toggle_line("extrusion_rate_smoothing_external_perimeter_only", have_volumetric_extrusion_rate_slope);
     if(have_volumetric_extrusion_rate_slope) config->set_key_value("enable_arc_fitting", new ConfigOptionBool(false));
     if(have_volumetric_extrusion_rate_slope_segment_length==0) {
         DynamicPrintConfig new_conf = *config;

src/slic3r/GUI/Tab.cpp

@@ -2215,6 +2215,7 @@ void TabPrint::build()
         optgroup = page->new_optgroup(L("Advanced"), L"param_advanced", 15);
         optgroup->append_single_option_line("max_volumetric_extrusion_rate_slope", "extrusion-rate-smoothing");
         optgroup->append_single_option_line("max_volumetric_extrusion_rate_slope_segment_length", "extrusion-rate-smoothing");
+        optgroup->append_single_option_line("extrusion_rate_smoothing_external_perimeter_only", "extrusion-rate-smoothing");
 
     page = add_options_page(L("Support"), "custom-gcode_support"); // ORCA: icon only visible on placeholders
         optgroup = page->new_optgroup(L("Support"), L"param_support");