Add two parameters for infill speed limiting.

One for infills that cross itself and one for the others.

src/libslic3r/ExtrusionEntity.hpp

@@ -134,9 +134,12 @@ struct ExtrusionAttributes : ExtrusionFlow
     ExtrusionAttributes(ExtrusionRole role) : role{ role } {}
     ExtrusionAttributes(ExtrusionRole role, const Flow &flow) : role{ role }, ExtrusionFlow{ flow } {}
     ExtrusionAttributes(ExtrusionRole role, const ExtrusionFlow &flow) : role{ role }, ExtrusionFlow{ flow } {}
+    ExtrusionAttributes(ExtrusionRole role, const ExtrusionFlow &flow, const bool maybe_self_crossing)
+        : role{role}, ExtrusionFlow{flow}, maybe_self_crossing(maybe_self_crossing) {}
 
     // What is the role / purpose of this extrusion?
     ExtrusionRole   role{ ExtrusionRole::None };
+    bool maybe_self_crossing{false};
     // OVerhangAttributes are currently computed for perimeters if dynamic overhangs are enabled. 
     // They are used to control fan and print speed in export.
     std::optional<OverhangAttributes> overhang_attributes;

src/libslic3r/Fill/Fill.cpp

@@ -573,8 +573,10 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
                     // When prefer_clockwise_movements is true, we have to ensure that extrusion paths will not be reversed during path planning.
                     extrusion_entities_append_paths(
                         eec->entities, std::move(polylines),
-						ExtrusionAttributes{ surface_fill.params.extrusion_role,
-							ExtrusionFlow{ flow_mm3_per_mm, float(flow_width), surface_fill.params.flow.height() } 
+						ExtrusionAttributes{
+                            surface_fill.params.extrusion_role,
+							ExtrusionFlow{ flow_mm3_per_mm, float(flow_width), surface_fill.params.flow.height() },
+                            f->is_self_crossing()
 						}, !params.prefer_clockwise_movements);
                     layerm.m_fills.entities.push_back(eec);
                 }

src/libslic3r/Fill/Fill3DHoneycomb.hpp

@@ -22,6 +22,7 @@ public:
 
 	// require bridge flow since most of this pattern hangs in air
     bool use_bridge_flow() const override { return true; }
+    bool is_self_crossing() override { return false; }
 
 protected:
 	void _fill_surface_single(

src/libslic3r/Fill/FillAdaptive.hpp

@@ -75,6 +75,7 @@ protected:
     // may not be optimal as the internal infill lines may get extruded before the long infill
     // lines to which the short infill lines are supposed to anchor.
 	bool no_sort() const override { return false; }
+    bool is_self_crossing() override { return true; }
 };
 
 } // namespace FillAdaptive

src/libslic3r/Fill/FillBase.hpp

@@ -123,6 +123,8 @@ public:
     // Do not sort the fill lines to optimize the print head path?
     virtual bool no_sort() const { return false; }
 
+    virtual bool is_self_crossing() = 0;
+
     // Perform the fill.
     virtual Polylines fill_surface(const Surface *surface, const FillParams &params);
     virtual ThickPolylines fill_surface_arachne(const Surface *surface, const FillParams &params);

src/libslic3r/Fill/FillConcentric.hpp

@@ -19,6 +19,7 @@ class FillConcentric : public Fill
 {
 public:
     ~FillConcentric() override = default;
+    bool is_self_crossing() override { return false; }
 
 protected:
     Fill* clone() const override { return new FillConcentric(*this); };

src/libslic3r/Fill/FillEnsuring.hpp

@@ -23,6 +23,7 @@ public:
     {
         return make_fill_polylines(this, surface, params, true, true, true);
     };
+    bool is_self_crossing() override { return false; }
 
 protected:
     void fill_surface_single_arachne(const Surface &surface, const FillParams &params, ThickPolylines &thick_polylines_out);

src/libslic3r/Fill/FillGyroid.hpp

@@ -20,6 +20,7 @@ public:
 
     // require bridge flow since most of this pattern hangs in air
     bool use_bridge_flow() const override { return false; }
+    bool is_self_crossing() override { return false; }
 
     // Correction applied to regular infill angle to maximize printing
     // speed in default configuration (degrees)

src/libslic3r/Fill/FillHoneycomb.hpp

@@ -22,6 +22,7 @@ class FillHoneycomb : public Fill
 {
 public:
     ~FillHoneycomb() override {}
+    bool is_self_crossing() override { return false; }
 
 protected:
     Fill* clone() const override { return new FillHoneycomb(*this); };

src/libslic3r/Fill/FillLightning.hpp

@@ -24,8 +24,10 @@ class Filler : public Slic3r::Fill
 {
 public:
     ~Filler() override = default;
+    bool is_self_crossing() override { return false; }
 
     Generator   *generator { nullptr };
+
 protected:
     Fill* clone() const override { return new Filler(*this); }
 

src/libslic3r/Fill/FillLine.hpp

@@ -19,6 +19,7 @@ class FillLine : public Fill
 public:
     Fill* clone() const override { return new FillLine(*this); };
     ~FillLine() override = default;
+    bool is_self_crossing() override { return false; }
 
 protected:
 	void _fill_surface_single(

src/libslic3r/Fill/FillPlanePath.hpp

@@ -26,6 +26,7 @@ class FillPlanePath : public Fill
 {
 public:
     ~FillPlanePath() override = default;
+    bool is_self_crossing() override { return false; }
 
 protected:
     void _fill_surface_single(

src/libslic3r/Fill/FillRectilinear.hpp

@@ -26,6 +26,7 @@ public:
     Fill* clone() const override { return new FillRectilinear(*this); }
     ~FillRectilinear() override = default;
     Polylines fill_surface(const Surface *surface, const FillParams &params) override;
+    bool is_self_crossing() override { return false; }
 
 protected:
     // Fill by single directional lines, interconnect the lines along perimeters.
@@ -75,6 +76,7 @@ public:
     Fill* clone() const override { return new FillGrid(*this); }
     ~FillGrid() override = default;
     Polylines fill_surface(const Surface *surface, const FillParams &params) override;
+    bool is_self_crossing() override { return true; }
 
 protected:
 	// The grid fill will keep the angle constant between the layers, see the implementation of Slic3r::Fill.
@@ -87,6 +89,7 @@ public:
     Fill* clone() const override { return new FillTriangles(*this); }
     ~FillTriangles() override = default;
     Polylines fill_surface(const Surface *surface, const FillParams &params) override;
+    bool is_self_crossing() override { return true; }
 
 protected:
 	// The grid fill will keep the angle constant between the layers, see the implementation of Slic3r::Fill.
@@ -99,6 +102,7 @@ public:
     Fill* clone() const override { return new FillStars(*this); }
     ~FillStars() override = default;
     Polylines fill_surface(const Surface *surface, const FillParams &params) override;
+    bool is_self_crossing() override { return true; }
 
 protected:
     // The grid fill will keep the angle constant between the layers, see the implementation of Slic3r::Fill.
@@ -111,6 +115,7 @@ public:
     Fill* clone() const override { return new FillCubic(*this); }
     ~FillCubic() override = default;
     Polylines fill_surface(const Surface *surface, const FillParams &params) override;
+    bool is_self_crossing() override { return true; }
 
 protected:
 	// The grid fill will keep the angle constant between the layers, see the implementation of Slic3r::Fill.

src/libslic3r/GCode.cpp

@@ -3270,16 +3270,26 @@ std::string GCodeGenerator::travel_to_first_position(const Vec3crd& point, const
 }
 
 double cap_speed(
-    double speed, const double mm3_per_mm, const FullPrintConfig &config, int extruder_id
+    double speed, const FullPrintConfig &config, int extruder_id, const ExtrusionAttributes &path_attr
 ) {
-    const double general_cap{config.max_volumetric_speed.value};
-    if (general_cap > 0) {
-        speed = std::min(speed, general_cap / mm3_per_mm);
+    const double general_volumetric_cap{config.max_volumetric_speed.value};
+    if (general_volumetric_cap > 0) {
+        speed = std::min(speed, general_volumetric_cap / path_attr.mm3_per_mm);
     }
-    const double filament_cap{config.filament_max_volumetric_speed.get_at(extruder_id)};
-    if (filament_cap > 0) {
-        speed = std::min(speed, filament_cap / mm3_per_mm);
+    const double filament_volumetric_cap{config.filament_max_volumetric_speed.get_at(extruder_id)};
+    if (filament_volumetric_cap > 0) {
+        speed = std::min(speed, filament_volumetric_cap / path_attr.mm3_per_mm);
     }
+    if (path_attr.role == ExtrusionRole::InternalInfill) {
+        const double infill_cap{
+            path_attr.maybe_self_crossing ?
+                config.filament_infill_max_crossing_speed.get_at(extruder_id) :
+                config.filament_infill_max_speed.get_at(extruder_id)};
+        if (infill_cap > 0) {
+            speed = std::min(speed, infill_cap);
+        }
+    }
+
     return speed;
 }
 
@@ -3411,7 +3421,7 @@ std::string GCodeGenerator::_extrude(
         if (external_perim_reference_speed == 0)
             external_perim_reference_speed = m_volumetric_speed / path_attr.mm3_per_mm;
         external_perim_reference_speed = cap_speed(
-            external_perim_reference_speed, path_attr.mm3_per_mm, m_config, m_writer.extruder()->id()
+            external_perim_reference_speed, m_config, m_writer.extruder()->id(), path_attr
         );
 
         dynamic_speed_and_fan_speed = ExtrusionProcessor::calculate_overhang_speed(path_attr, this->m_config, m_writer.extruder()->id(),
@@ -3423,7 +3433,7 @@ std::string GCodeGenerator::_extrude(
     }
 
     // cap speed with max_volumetric_speed anyway (even if user is not using autospeed)
-    speed = cap_speed(speed, path_attr.mm3_per_mm, m_config, m_writer.extruder()->id());
+    speed = cap_speed(speed, m_config, m_writer.extruder()->id(), path_attr);
 
     double F = speed * 60;  // convert mm/sec to mm/min
 

src/libslic3r/Preset.cpp

@@ -486,7 +486,7 @@ static std::vector<std::string> s_Preset_print_options {
 };
 
 static std::vector<std::string> s_Preset_filament_options {
-    "filament_colour", "filament_diameter", "filament_type", "filament_soluble", "filament_notes", "filament_max_volumetric_speed",
+    "filament_colour", "filament_diameter", "filament_type", "filament_soluble", "filament_notes", "filament_max_volumetric_speed", "filament_infill_max_speed", "filament_infill_max_crossing_speed",
     "extrusion_multiplier", "filament_density", "filament_cost", "filament_spool_weight", "filament_loading_speed", "filament_loading_speed_start", "filament_load_time",
     "filament_unloading_speed", "filament_unloading_speed_start", "filament_unload_time", "filament_toolchange_delay", "filament_cooling_moves", "filament_stamping_loading_speed", "filament_stamping_distance",
     "filament_cooling_initial_speed", "filament_purge_multiplier", "filament_cooling_final_speed", "filament_ramming_parameters", "filament_minimal_purge_on_wipe_tower",

src/libslic3r/Print.cpp

@@ -235,6 +235,8 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
             || opt_key == "filament_multitool_ramming_volume"
             || opt_key == "filament_multitool_ramming_flow"
             || opt_key == "filament_max_volumetric_speed"
+            || opt_key == "filament_infill_max_speed"
+            || opt_key == "filament_infill_max_crossing_speed"
             || opt_key == "gcode_flavor"
             || opt_key == "high_current_on_filament_swap"
             || opt_key == "infill_first"

src/libslic3r/PrintConfig.cpp

@@ -1137,6 +1137,26 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloats { 0. });
 
+    def = this->add("filament_infill_max_speed", coFloats);
+    def->label = L("Max simple infill speed");
+    def->tooltip = L("Maximum speed allowed for this filament while printing simple infill. "
+                   "The term \"simple infill\" means infill without any self intersections in a single layer. "
+                   "Set to zero for no limit.");
+    def->sidetext = L("mm/s");
+    def->min = 0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloats { 0. });
+
+    def = this->add("filament_infill_max_crossing_speed", coFloats);
+    def->label = L("Max crossing infill speed");
+    def->tooltip = L("Maximum speed allowed for this filament while printing crossing infill. "
+                   "The term \"crossing infill\" means infill with self intersections in a single layer. "
+                   "Set to zero for no limit.");
+    def->sidetext = L("mm/s");
+    def->min = 0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloats { 0. });
+
     def = this->add("filament_loading_speed", coFloats);
     def->label = L("Loading speed");
     def->tooltip = L("Speed used for loading the filament on the wipe tower.");

src/libslic3r/PrintConfig.hpp

@@ -762,6 +762,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloats,              filament_cost))
     ((ConfigOptionFloats,              filament_spool_weight))
     ((ConfigOptionFloats,              filament_max_volumetric_speed))
+    ((ConfigOptionFloats,              filament_infill_max_speed))
+    ((ConfigOptionFloats,              filament_infill_max_crossing_speed))
     ((ConfigOptionFloats,              filament_loading_speed))
     ((ConfigOptionFloats,              filament_loading_speed_start))
     ((ConfigOptionFloats,              filament_load_time))

src/slic3r/GUI/Tab.cpp

@@ -2238,6 +2238,9 @@ void TabFilament::build()
         };
         optgroup->append_line(line);
 
+        optgroup->append_single_option_line("filament_infill_max_speed", "max-simple-infill-speed");
+        optgroup->append_single_option_line("filament_infill_max_crossing_speed", "max-crossing-infill-speed");
+
         optgroup = page->new_optgroup(L("Shrinkage compensation"));
         optgroup->append_single_option_line("filament_shrinkage_compensation_xy");
         optgroup->append_single_option_line("filament_shrinkage_compensation_z");