#101 add ratio /distribution for the smoothing flow in ironing (see tooltip)

resources/profiles/PrusaResearch.ini

@@ -96,7 +96,7 @@ bridge_acceleration = 1000
 bridge_angle = 0
 bridge_flow_ratio = 80%
 over_bridge_flow_ratio = 120%
-fill_top_flow_ratio = 120%
+fill_top_flow_ratio = 100%
 bridge_speed = 20
 brim_width = 0
 clip_multipart_objects = 1

src/libslic3r/Fill/FillSmooth.cpp

@@ -18,6 +18,7 @@ namespace Slic3r {
         return polylines_out;
     }
 
+    /// @idx: the index of the step (0 = first step, 1 = second step, ...) The first lay down the volume and the others smoothen the surface.
     void FillSmooth::perform_single_fill(const int idx, ExtrusionEntityCollection &eecroot, const Surface &srf_source,
         const FillParams &params, const double volume){
         if (srf_source.expolygon.empty()) return;
@@ -26,14 +27,18 @@ namespace Slic3r {
         ExtrusionEntityCollection *eec = new ExtrusionEntityCollection();
         eec->no_sort = false;
         FillParams params_modifided = params;
-        if (params.config != NULL && rolePass[idx] == ExtrusionRole::erTopSolidInfill) params_modifided.density /= (float)params.config->fill_smooth_width.get_abs_value(1);
+        if (params.config != NULL && idx > 0) params_modifided.density /= (float)params.config->fill_smooth_width.get_abs_value(1);
+        else if (params.config != NULL && idx == 0) params_modifided.density *= 1;
         else params_modifided.density *= (float)percentWidth[idx];
         // reduce flow for each increase in density
         params_modifided.flow_mult *= params.density;
         params_modifided.flow_mult /= params_modifided.density;
         // split the flow between steps
-        params_modifided.flow_mult *= (float)percentFlow[idx];
-        
+        if (params.config != NULL && idx > 0) params_modifided.flow_mult *= (float)params.config->fill_smooth_distribution.get_abs_value(1);
+        else if (params.config != NULL && idx == 0) params_modifided.flow_mult *= (1.f - (float)params.config->fill_smooth_distribution.get_abs_value(1));
+        else params_modifided.flow_mult *= (float)percentFlow[idx];
+
+        //choose if we are going to extrude with or without overlap
         if ((params.flow->bridge && idx == 0) || has_overlap[idx]){
             this->fill_expolygon(idx, *eec, srf_source, params_modifided, volume);
         }
@@ -86,11 +91,11 @@ namespace Slic3r {
                 good_role = params.flow->bridge && idx == 0 ? erBridgeInfill : rolePass[idx];
             }
             // print
-            float mult_flow = (params.fill_exactly && idx == 0 ? std::min(2., volume / extrudedVolume) : 1);
+            float mult_flow = (params.fill_exactly /*&& idx == 0*/ ? std::min(2., volume / extrudedVolume) : 1);
             extrusion_entities_append_paths(
                 eec.entities, std::move(polylines_layer),
                 good_role,
-                params.flow_mult * params.flow->mm3_per_mm() * mult_flow,
+                params.flow->mm3_per_mm() * params.flow_mult * mult_flow,
                 //min-reduced flow width for a better view (it's only a gui thing)
                 (float)(params.flow->width * (params.flow_mult* mult_flow < 0.1 ? 0.1 : params.flow_mult * mult_flow)), (float)params.flow->height);
         }

src/libslic3r/Fill/FillSmooth.hpp

@@ -44,7 +44,7 @@ protected:
     int nbPass=2;
     // this parameter is now erased by fill_smooth_width when available.
     double percentWidth[3];
-    // this parameter is now modified by fill_top_flow_ratio when available.
+    // this parameter is now modified by fill_smooth_distribution when available. (note that fill_top_flow_ratio can also increasse the params.flow_mult passed by fill.cpp)
     double percentFlow[3];
     //angle to add to base angle
     float anglePass[3];
@@ -76,7 +76,7 @@ public:
         rolePass[0] = erTopSolidInfill;//erSolidInfill
         rolePass[1] = erSolidInfill;
         rolePass[2] = erTopSolidInfill;
-        percentWidth[0] = 1.4; //0.8
+        percentWidth[0] = 1; //0.8
         percentWidth[1] = 1.5;
         percentWidth[2] = 2.8;
         percentFlow[0] = 1; //0.7

src/libslic3r/PrintConfig.cpp

@@ -1164,11 +1164,21 @@ void PrintConfigDef::init_fff_params()
     def = this->add("fill_smooth_width", coFloatOrPercent);
     def->label = L("width");
     def->full_label = L("Ironing width");
-    def->tooltip = L("This is the width of the ironing pass, in a % of the top width, should be no more than 50%.");
+    def->tooltip = L("This is the width of the ironing pass, in a % of the top extrusion width, should not be more than 50%.");
     def->min = 0;
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionFloatOrPercent(50, true));
 
+    def = this->add("fill_smooth_distribution", coFloatOrPercent);
+    def->label = L("distribution");
+    def->full_label = L("Ironing flow distribution");
+    def->tooltip = L("This is the percentage of the flow that is used for the second ironing pass. Typical 0-20%. "
+        "Should not be lower than 20%, unless you have your top extrusion width greatly superior to your nozzle width.");
+    def->min = 0;
+    def->max = 0.9;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloatOrPercent(10, true));
+
     def = this->add("first_layer_acceleration", coFloat);
     def->label = L("First layer");
     def->full_label = L("First layer acceleration");

src/libslic3r/PrintConfig.hpp

@@ -592,6 +592,7 @@ public:
     ConfigOptionPercent             fill_density;
     ConfigOptionEnum<InfillPattern> fill_pattern;
     ConfigOptionFloatOrPercent      fill_top_flow_ratio;
+    ConfigOptionFloatOrPercent      fill_smooth_distribution;
     ConfigOptionFloatOrPercent      fill_smooth_width;
     ConfigOptionBool                gap_fill;
     ConfigOptionFloatOrPercent      gap_fill_min_area;
@@ -659,6 +660,7 @@ protected:
         OPT_PTR(fill_density);
         OPT_PTR(fill_pattern);
         OPT_PTR(fill_top_flow_ratio);
+        OPT_PTR(fill_smooth_distribution);
         OPT_PTR(fill_smooth_width);
         OPT_PTR(gap_fill);
         OPT_PTR(gap_fill_min_area);

src/libslic3r/PrintObject.cpp

@@ -560,6 +560,7 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "fill_pattern"
             || opt_key == "fill_top_flow_ratio"
             || opt_key == "fill_smooth_width"
+            || opt_key == "fill_smooth_distribution"
             || opt_key == "top_infill_extrusion_width"
             || opt_key == "first_layer_extrusion_width") {
             steps.emplace_back(posInfill);

src/slic3r/GUI/ConfigManipulation.cpp

@@ -279,7 +279,7 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig* config)
     // gap fill  can appear in infill
     //toggle_field("gap_fill_speed", have_perimeters && config->opt_bool("gap_fill"));
 
-    for (auto el : {"fill_smooth_width" })
+    for (auto el : {"fill_smooth_width, fill_smooth_distribution" })
         toggle_field(el, config->opt_enum<InfillPattern>("top_fill_pattern") == InfillPattern::ipSmooth);
 
     bool have_top_solid_infill = config->opt_int("top_solid_layers") > 0;

src/slic3r/GUI/Preset.cpp

@@ -385,6 +385,7 @@ const std::vector<std::string>& Preset::print_options()
         , "fill_pattern"
         , "fill_top_flow_ratio"
         , "fill_smooth_width"
+        , "fill_smooth_distribution"
         , "top_fill_pattern"
         , "bottom_fill_pattern"
         , "solid_fill_pattern",

src/slic3r/GUI/Tab.cpp

@@ -1145,6 +1145,7 @@ void TabPrint::build()
 
         optgroup = page->new_optgroup(_(L("Advanced Infill")));
         line.append_option(optgroup->get_option("fill_smooth_width"));
+        line.append_option(optgroup->get_option("fill_smooth_distribution"));
         optgroup->append_line(line);
 
 	page = add_options_page(_(L("Skirt and brim")), "skirt+brim");