SPE-2542: Add first_layer_infill_speed

src/libslic3r/GCode.cpp

@@ -3408,8 +3408,14 @@ std::string GCodeGenerator::_extrude(
     }
     if (m_volumetric_speed != 0. && speed == 0)
         speed = m_volumetric_speed / path_attr.mm3_per_mm;
-    if (this->on_first_layer())
+    if (this->on_first_layer()) {
+        const double first_layer_infill_speed{m_config.get_abs_value("first_layer_infill_speed", speed)};
+        if (path_attr.role == ExtrusionRole::SolidInfill && first_layer_infill_speed > 0) {
+            speed = first_layer_infill_speed;
+        } else {
             speed = m_config.get_abs_value("first_layer_speed", speed);
+        }
+    }
     else if (this->object_layer_over_raft())
         speed = m_config.get_abs_value("first_layer_speed_over_raft", speed);
 

src/libslic3r/Preset.cpp

@@ -485,7 +485,7 @@ static std::vector<std::string> s_Preset_print_options {
     "perimeter_speed", "small_perimeter_speed", "external_perimeter_speed", "infill_speed", "solid_infill_speed",
     "enable_dynamic_overhang_speeds", "overhang_speed_0", "overhang_speed_1", "overhang_speed_2", "overhang_speed_3",
     "top_solid_infill_speed", "support_material_speed", "support_material_xy_spacing", "support_material_interface_speed",
-    "bridge_speed", "over_bridge_speed", "gap_fill_speed", "gap_fill_enabled", "travel_speed", "travel_speed_z", "first_layer_speed", "first_layer_speed_over_raft", "perimeter_acceleration", "infill_acceleration",
+    "bridge_speed", "over_bridge_speed", "gap_fill_speed", "gap_fill_enabled", "travel_speed", "travel_speed_z", "first_layer_speed", "first_layer_infill_speed", "first_layer_speed_over_raft", "perimeter_acceleration", "infill_acceleration",
     "external_perimeter_acceleration", "top_solid_infill_acceleration", "solid_infill_acceleration", "travel_acceleration", "wipe_tower_acceleration",
     "bridge_acceleration", "first_layer_acceleration", "first_layer_acceleration_over_raft", "default_acceleration", "skirts", "skirt_distance", "skirt_height", "draft_shield",
     "min_skirt_length", "brim_width", "brim_separation", "brim_type", "support_material", "support_material_auto", "support_material_threshold", "support_material_enforce_layers",

src/libslic3r/PrintConfig.cpp

@@ -1630,6 +1630,18 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloatOrPercent(30, false));
 
+    def = this->add("first_layer_infill_speed", coFloatOrPercent);
+    def->label = L("First layer solid infill speed");
+    def->tooltip = L("If expressed as absolute value in mm/s, this speed will be applied to the solid infill print moves "
+                   "of the first layer. If expressed as a percentage "
+                   "(for example: 40%) it will be a percantage of the solid infill speed "
+                   "(for example: 40% of the solid infill speed). "
+                   "Note that 0 means that the \"First layer speed\" value will be used.");
+    def->sidetext = L("mm/s or %");
+    def->min = 0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloatOrPercent(0, false));
+
     def = this->add("first_layer_speed_over_raft", coFloatOrPercent);
     def->label = L("Speed of object first layer over raft interface");
     def->tooltip = L("If expressed as absolute value in mm/s, this speed will be applied to all the print moves "

src/libslic3r/PrintConfig.hpp

@@ -937,6 +937,7 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionFloatOrPercent,     first_layer_extrusion_width))
     ((ConfigOptionFloatOrPercent,     first_layer_height))
     ((ConfigOptionFloatOrPercent,     first_layer_speed))
+    ((ConfigOptionFloatOrPercent,     first_layer_infill_speed))
     ((ConfigOptionInts,               first_layer_temperature))
     ((ConfigOptionIntsNullable,       idle_temperature))
     ((ConfigOptionInts,               full_fan_speed_layer))

src/libslic3r/PrintObject.cpp

@@ -920,6 +920,7 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "external_perimeter_speed"
             || opt_key == "small_perimeter_speed"
             || opt_key == "solid_infill_speed"
+            || opt_key == "first_layer_infill_speed"
             || opt_key == "top_solid_infill_speed") {
             invalidated |= m_print->invalidate_step(psGCodeExport);
         } else if (

src/slic3r/GUI/Tab.cpp

@@ -1602,6 +1602,7 @@ void TabPrint::build()
 
         optgroup = page->new_optgroup(L("Modifiers"));
         optgroup->append_single_option_line("first_layer_speed");
+        optgroup->append_single_option_line("first_layer_infill_speed");
         optgroup->append_single_option_line("first_layer_speed_over_raft");
 
         optgroup = page->new_optgroup(L("Acceleration control (advanced)"));