Ooze prevention:

- remove the infinite skirt
- added 'idle_temperature' in Filament Settings as an optional parameter
- the logic is changed: if idle_temp is present, it is used,
  otherwise it uses the old delta value from Print Settings
- TODO: the optional parameter is not well supported in UI

src/libslic3r/GCode.cpp

@@ -113,26 +113,19 @@ namespace Slic3r {
     {
         std::string gcode;
 
-        // move to the nearest standby point
-        if (!this->standby_points.empty()) {
-            // get current position in print coordinates
-            Vec3d writer_pos = gcodegen.writer().get_position();
-            Point pos = Point::new_scale(writer_pos(0), writer_pos(1));
-
-            // find standby point
-            Point standby_point = nearest_point(this->standby_points, pos).first;
-
-            /*  We don't call gcodegen.travel_to() because we don't need retraction (it was already
-                triggered by the caller) nor avoid_crossing_perimeters and also because the coordinates
-                of the destination point must not be transformed by origin nor current extruder offset.  */
-            gcode += gcodegen.writer().travel_to_xy(unscale(standby_point),
-                "move to standby position");
-        }
-
-        if (gcodegen.config().standby_temperature_delta.value != 0) {
-            // we assume that heating is always slower than cooling, so no need to block
-            gcode += gcodegen.writer().set_temperature
-            (this->_get_temp(gcodegen) + gcodegen.config().standby_temperature_delta.value, false, gcodegen.writer().extruder()->id());
+        unsigned int extruder_id = gcodegen.writer().extruder()->id();
+        const ConfigOptionIntsNullable& filament_idle_temp = gcodegen.config().idle_temperature;
+        if (filament_idle_temp.is_nil(extruder_id)) {
+            // There is no idle temperature defined in filament settings.
+            // Use the delta value from print config.
+            if (gcodegen.config().standby_temperature_delta.value != 0) {
+                // we assume that heating is always slower than cooling, so no need to block
+                gcode += gcodegen.writer().set_temperature
+                (this->_get_temp(gcodegen) + gcodegen.config().standby_temperature_delta.value, false, extruder_id);
+            }
+        } else {
+            // Use the value from filament settings. That one is absolute, not delta.
+            gcode += gcodegen.writer().set_temperature(filament_idle_temp.get_at(extruder_id), false, extruder_id);
         }
 
         return gcode;
@@ -145,8 +138,7 @@ namespace Slic3r {
             std::string();
     }
 
-    int
-        OozePrevention::_get_temp(GCode& gcodegen)
+    int OozePrevention::_get_temp(const GCode& gcodegen) const
     {
         return (gcodegen.layer() != nullptr && gcodegen.layer()->id() == 0)
             ? gcodegen.config().first_layer_temperature.get_at(gcodegen.writer().extruder()->id())
@@ -885,34 +877,7 @@ namespace DoExport {
 
     static void init_ooze_prevention(const Print &print, OozePrevention &ooze_prevention)
 	{
-	    // Calculate wiping points if needed
-	    if (print.config().ooze_prevention.value && ! print.config().single_extruder_multi_material) {
-	        Points skirt_points;
-	        for (const ExtrusionEntity *ee : print.skirt().entities)
-	            for (const ExtrusionPath &path : dynamic_cast<const ExtrusionLoop*>(ee)->paths)
-	                append(skirt_points, path.polyline.points);
-	        if (! skirt_points.empty()) {
-	            Polygon outer_skirt = Slic3r::Geometry::convex_hull(skirt_points);
-	            Polygons skirts;
-	            for (unsigned int extruder_id : print.extruders()) {
-	                const Vec2d &extruder_offset = print.config().extruder_offset.get_at(extruder_id);
-	                Polygon s(outer_skirt);
-	                s.translate(Point::new_scale(-extruder_offset(0), -extruder_offset(1)));
-	                skirts.emplace_back(std::move(s));
-	            }
-	            ooze_prevention.enable = true;
-	            //ooze_prevention.standby_points = offset(Slic3r::Geometry::convex_hull(skirts), float(scale_(3.))).front().equally_spaced_points(float(scale_(10.)));
-	#if 0
-	                require "Slic3r/SVG.pm";
-	                Slic3r::SVG::output(
-	                    "ooze_prevention.svg",
-	                    red_polygons    => \@skirts,
-	                    polygons        => [$outer_skirt],
-	                    points          => $gcodegen->ooze_prevention->standby_points,
-	                );
-	#endif
-	        }
-	    }
+	    ooze_prevention.enable = print.config().ooze_prevention.value && ! print.config().single_extruder_multi_material;
 	}
 
 	// Fill in print_statistics and return formatted string containing filament statistics to be inserted into G-code comment section.
@@ -1274,8 +1239,9 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
     // Set other general things.
     file.write(this->preamble());
 
-    // Calculate wiping points if needed
+    // Enable ooze prevention if configured so.
     DoExport::init_ooze_prevention(print, m_ooze_prevention);
+
     print.throw_if_canceled();
 
     // Collect custom seam data from all objects.
@@ -1806,7 +1772,7 @@ void GCode::_print_first_layer_extruder_temperatures(GCodeOutputStream &file, Pr
         m_writer.set_temperature(temp, wait, first_printing_extruder_id);
     } else {
         // Custom G-code does not set the extruder temperature. Do it now.
-        if (print.config().single_extruder_multi_material.value) {
+        if (print.config().single_extruder_multi_material.value || m_ooze_prevention.enable) {
             // Set temperature of the first printing extruder only.
             int temp = print.config().first_layer_temperature.get_at(first_printing_extruder_id);
             if (temp > 0)
@@ -2128,11 +2094,14 @@ LayerResult GCode::process_layer(
         // Transition from 1st to 2nd layer. Adjust nozzle temperatures as prescribed by the nozzle dependent
         // first_layer_temperature vs. temperature settings.
         for (const Extruder &extruder : m_writer.extruders()) {
-            if (print.config().single_extruder_multi_material.value && extruder.id() != m_writer.extruder()->id())
+            if (print.config().single_extruder_multi_material.value || m_ooze_prevention.enable) {
                 // In single extruder multi material mode, set the temperature for the current extruder only.
-                continue;
+                // The same applies when ooze prevention is enabled.
+                if (extruder.id() != m_writer.extruder()->id())
+                    continue;
+            }
             int temperature = print.config().temperature.get_at(extruder.id());
-            if (temperature > 0 && temperature != print.config().first_layer_temperature.get_at(extruder.id()))
+            if (temperature > 0 && (temperature != print.config().first_layer_temperature.get_at(extruder.id())))
                 gcode += m_writer.set_temperature(temperature, false, extruder.id());
         }
         gcode += m_writer.set_bed_temperature(print.config().bed_temperature.get_at(first_extruder_id));
@@ -3206,8 +3175,7 @@ std::string GCode::set_extruder(unsigned int extruder_id, double print_z)
     }
 
 
-    // If ooze prevention is enabled, park current extruder in the nearest
-    // standby point and set it to the standby temperature.
+    // If ooze prevention is enabled, set current extruder to the standby temperature.
     if (m_ooze_prevention.enable && m_writer.extruder() != nullptr)
         gcode += m_ooze_prevention.pre_toolchange(*this);
 

src/libslic3r/GCode.hpp

@@ -39,14 +39,13 @@ struct PrintInstance;
 class OozePrevention {
 public:
     bool enable;
-    Points standby_points;
     
     OozePrevention() : enable(false) {}
     std::string pre_toolchange(GCode &gcodegen);
     std::string post_toolchange(GCode &gcodegen);
     
 private:
-    int _get_temp(GCode &gcodegen);
+    int _get_temp(const GCode &gcodegen) const;
 };
 
 class Wipe {

src/libslic3r/Preset.cpp

@@ -470,7 +470,7 @@ static std::vector<std::string> s_Preset_filament_options {
     "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_cooling_initial_speed", "filament_cooling_final_speed", "filament_ramming_parameters", "filament_minimal_purge_on_wipe_tower",
-    "temperature", "first_layer_temperature", "bed_temperature", "first_layer_bed_temperature", "fan_always_on", "cooling", "min_fan_speed",
+    "temperature", "idle_temperature", "first_layer_temperature", "bed_temperature", "first_layer_bed_temperature", "fan_always_on", "cooling", "min_fan_speed",
     "max_fan_speed", "bridge_fan_speed", "disable_fan_first_layers", "full_fan_speed_layer", "fan_below_layer_time", "slowdown_below_layer_time", "min_print_speed",
     "start_filament_gcode", "end_filament_gcode",
     // Retract overrides

src/libslic3r/Print.cpp

@@ -191,6 +191,7 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
             || opt_key == "infill_first"
             || opt_key == "single_extruder_multi_material"
             || opt_key == "temperature"
+            || opt_key == "idle_temperature"
             || opt_key == "wipe_tower"
             || opt_key == "wipe_tower_width"
             || opt_key == "wipe_tower_brim_width"

src/libslic3r/PrintConfig.cpp

@@ -229,6 +229,11 @@ static void assign_printer_technology_to_unknown(t_optiondef_map &options, Print
             kvp.second.printer_technology = printer_technology;
 }
 
+// Maximum extruder temperature, bumped to 1500 to support printing of glass.
+namespace {
+    const int max_temp = 1500;
+};
+
 PrintConfigDef::PrintConfigDef()
 {
     this->init_common_params();
@@ -1972,9 +1977,7 @@ void PrintConfigDef::init_fff_params()
 
     def = this->add("ooze_prevention", coBool);
     def->label = L("Enable");
-    def->tooltip = L("This option will drop the temperature of the inactive extruders to prevent oozing. "
-                   "It will enable a tall skirt automatically and move extruders outside such "
-                   "skirt when changing temperatures.");
+    def->tooltip = L("This option will drop the temperature of the inactive extruders to prevent oozing. ");
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionBool(false));
 
@@ -2475,7 +2478,8 @@ void PrintConfigDef::init_fff_params()
     def = this->add("standby_temperature_delta", coInt);
     def->label = L("Temperature variation");
     def->tooltip = L("Temperature difference to be applied when an extruder is not active. "
-                   "Enables a full-height \"sacrificial\" skirt on which the nozzles are periodically wiped.");
+                     "The value is not used when 'idle_temperature' in filament settings "
+                     "is defined.");
     def->sidetext = "∆°C";
     def->min = -max_temp;
     def->max = max_temp;
@@ -3731,6 +3735,15 @@ void PrintConfigDef::init_sla_params()
     def->min = 0;
     def->set_default_value(new ConfigOptionFloat(0.3));
 
+    def = this->add_nullable("idle_temperature", coInts);
+    def->label = L("Idle temperature");
+    def->tooltip = L("Nozzle temperature when the tool is currently not used in multi-tool setups."
+                     "This is only used when 'Ooze prevention is active in Print Settings.'");
+    def->sidetext = L("°C");
+    //def->min = 0;
+    //def->max = max_temp;
+    def->set_default_value(new ConfigOptionIntsNullable { ConfigOptionIntsNullable::nil_value() });
+
     def = this->add("bottle_volume", coFloat);
     def->label = L("Bottle volume");
     def->tooltip = L("Bottle volume");
@@ -4511,6 +4524,12 @@ std::string validate(const FullPrintConfig &cfg)
         assert(opt != nullptr);
         const ConfigOptionDef   *optdef = print_config_def.get(opt_key);
         assert(optdef != nullptr);
+
+        if (opt->nullable() && opt->is_nil()) {
+            // Do not check nil values
+            continue;
+        }
+
         bool out_of_range = false;
         switch (opt->type()) {
         case coFloat:

src/libslic3r/PrintConfig.hpp

@@ -769,6 +769,7 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionFloatOrPercent,     first_layer_height))
     ((ConfigOptionFloatOrPercent,     first_layer_speed))
     ((ConfigOptionInts,               first_layer_temperature))
+    ((ConfigOptionIntsNullable,       idle_temperature))
     ((ConfigOptionInts,               full_fan_speed_layer))
     ((ConfigOptionFloat,              infill_acceleration))
     ((ConfigOptionBool,               infill_first))

src/slic3r/GUI/Tab.cpp

@@ -1957,6 +1957,8 @@ void TabFilament::build()
         line.append_option(optgroup->get_option("temperature"));
         optgroup->append_line(line);
 
+        optgroup->append_single_option_line("idle_temperature");
+
         line = { L("Bed"), "" };
         line.append_option(optgroup->get_option("first_layer_bed_temperature"));
         line.append_option(optgroup->get_option("bed_temperature"));