SPE-2186: Add shrinkage compensation into filament settings.

There is a limitation that on multi-tool printers, all used filaments must have the same shrinkage compression values.

src/libslic3r/Geometry.cpp

@@ -637,6 +637,21 @@ Transform3d Transformation::get_matrix_no_scaling_factor() const
     return copy.get_matrix();
 }
 
+Transform3d Transformation::get_matrix_with_applied_shrinkage_compensation(const Vec3d &shrinkage_compensation) const {
+    const Transform3d shrinkage_trafo = Geometry::scale_transform(shrinkage_compensation);
+    const Vec3d trafo_offset         = this->get_offset();
+    const Vec3d trafo_offset_xy      = Vec3d(trafo_offset.x(), trafo_offset.y(), 0.);
+
+    Transformation copy(*this);
+    copy.set_offset(Axis::X, 0.);
+    copy.set_offset(Axis::Y, 0.);
+
+    Transform3d trafo_after_shrinkage    = (shrinkage_trafo * copy.get_matrix());
+    trafo_after_shrinkage.translation() += trafo_offset_xy;
+
+    return trafo_after_shrinkage;
+}
+
 Transformation Transformation::operator * (const Transformation& other) const
 {
     return Transformation(get_matrix() * other.get_matrix());

src/libslic3r/Geometry.hpp

@@ -460,6 +460,8 @@ public:
     Transform3d get_matrix_no_offset() const;
     Transform3d get_matrix_no_scaling_factor() const;
 
+    Transform3d get_matrix_with_applied_shrinkage_compensation(const Vec3d &shrinkage_compensation) const;
+
     void set_matrix(const Transform3d& transform) { m_matrix = transform; }
 
     Transformation operator * (const Transformation& other) const;

src/libslic3r/Model.cpp

@@ -1998,6 +1998,22 @@ void ModelVolume::convert_from_meters()
     this->source.is_converted_from_meters = true;
 }
 
+std::vector<size_t> ModelVolume::get_extruders_from_multi_material_painting() const {
+    if (!this->is_mm_painted())
+        return {};
+
+    assert(static_cast<size_t>(TriangleStateType::Extruder1) - 1 == 0);
+    const TriangleSelector::TriangleSplittingData &data = this->mm_segmentation_facets.get_data();
+
+    std::vector<size_t> extruders;
+    for (size_t state_idx = static_cast<size_t>(TriangleStateType::Extruder1); state_idx < data.used_states.size(); ++state_idx) {
+        if (data.used_states[state_idx])
+            extruders.emplace_back(state_idx - 1);
+    }
+
+    return extruders;
+}
+
 void ModelInstance::transform_mesh(TriangleMesh* mesh, bool dont_translate) const
 {
     mesh->transform(dont_translate ? get_matrix_no_offset() : get_matrix());

src/libslic3r/Model.hpp

@@ -910,6 +910,9 @@ public:
     bool is_seam_painted() const { return !this->seam_facets.empty(); }
     bool is_mm_painted() const { return !this->mm_segmentation_facets.empty(); }
 
+    // Returns 0-based indices of extruders painted by multi-material painting gizmo.
+    std::vector<size_t> get_extruders_from_multi_material_painting() const;
+
 protected:
 	friend class Print;
     friend class SLAPrint;

src/libslic3r/Preset.cpp

@@ -490,7 +490,9 @@ static std::vector<std::string> s_Preset_filament_options {
     "filament_retract_layer_change", "filament_wipe", "filament_retract_before_wipe", "filament_retract_length_toolchange", "filament_retract_restart_extra_toolchange", "filament_travel_ramping_lift",
     "filament_travel_slope", "filament_travel_max_lift", "filament_travel_lift_before_obstacle",
     // Profile compatibility
-    "filament_vendor", "compatible_prints", "compatible_prints_condition", "compatible_printers", "compatible_printers_condition", "inherits"
+    "filament_vendor", "compatible_prints", "compatible_prints_condition", "compatible_printers", "compatible_printers_condition", "inherits",
+    // Shrinkage compensation
+    "filament_shrinkage_compensation_xy", "filament_shrinkage_compensation_z",
 };
 
 static std::vector<std::string> s_Preset_machine_limits_options {

src/libslic3r/Print.cpp

@@ -209,7 +209,9 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
             // Spiral Vase forces different kind of slicing than the normal model:
             // In Spiral Vase mode, holes are closed and only the largest area contour is kept at each layer.
             // Therefore toggling the Spiral Vase on / off requires complete reslicing.
-            || opt_key == "spiral_vase") {
+            || opt_key == "spiral_vase"
+            || opt_key == "filament_shrinkage_compensation_xy"
+            || opt_key == "filament_shrinkage_compensation_z") {
             osteps.emplace_back(posSlice);
         } else if (
                opt_key == "complete_objects"
@@ -525,6 +527,9 @@ std::string Print::validate(std::vector<std::string>* warnings) const
                     goto DONE;
                 }
         DONE:;
+
+        if (!this->has_same_shrinkage_compensations())
+            warnings->emplace_back("_FILAMENT_SHRINKAGE_DIFFER");
     }
 
     if (m_objects.empty())
@@ -584,12 +589,19 @@ std::string Print::validate(std::vector<std::string>* warnings) const
         //FIXME It is quite expensive to generate object layers just to get the print height!
         if (auto layers = generate_object_layers(print_object.slicing_parameters(), layer_height_profile(print_object_idx));
             ! layers.empty() && layers.back() > this->config().max_print_height + EPSILON) {
-            return
-                // Test whether the last slicing plane is below or above the print volume.
-                0.5 * (layers[layers.size() - 2] + layers.back()) > this->config().max_print_height + EPSILON ?
-                format(_u8L("The object %1% exceeds the maximum build volume height."), print_object.model_object()->name) :
-                format(_u8L("While the object %1% itself fits the build volume, its last layer exceeds the maximum build volume height."), print_object.model_object()->name) +
-                " " + _u8L("You might want to reduce the size of your model or change current print settings and retry.");
+
+            const double shrinkage_compensation_z = this->shrinkage_compensation().z();
+            if (shrinkage_compensation_z != 1. && layers.back() > (this->config().max_print_height / shrinkage_compensation_z + EPSILON)) {
+                // The object exceeds the maximum build volume height because of shrinkage compensation.
+                return format(_u8L("While the object %1% itself fits the build volume, it exceeds the maximum build volume height because of material shrinkage compensation."), print_object.model_object()->name);
+            } else if (0.5 * (layers[layers.size() - 2] + layers.back()) > this->config().max_print_height + EPSILON) {
+                // The last slicing plane is below the print volume.
+                return format(_u8L("The object %1% exceeds the maximum build volume height."), print_object.model_object()->name);
+            } else {
+                // The last slicing plane is above the print volume.
+                return format(_u8L("While the object %1% itself fits the build volume, its last layer exceeds the maximum build volume height."), print_object.model_object()->name) +
+                    " " + _u8L("You might want to reduce the size of your model or change current print settings and retry.");
+            }
         }
     }
 
@@ -1618,6 +1630,40 @@ std::string Print::output_filename(const std::string &filename_base) const
     return this->PrintBase::output_filename(output_filename_format, ".gcode", filename_base, &config);
 }
 
+// Returns if all used filaments have same shrinkage compensations.
+bool Print::has_same_shrinkage_compensations() const {
+    const std::vector<unsigned int> extruders = this->extruders();
+    if (extruders.empty())
+        return false;
+
+    const double filament_shrinkage_compensation_xy = m_config.filament_shrinkage_compensation_xy.get_at(extruders.front());
+    const double filament_shrinkage_compensation_z  = m_config.filament_shrinkage_compensation_z.get_at(extruders.front());
+
+    for (unsigned int extruder : extruders) {
+        if (filament_shrinkage_compensation_xy != m_config.filament_shrinkage_compensation_xy.get_at(extruder) ||
+            filament_shrinkage_compensation_z  != m_config.filament_shrinkage_compensation_z.get_at(extruder)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+// Returns scaling for each axis representing shrinkage compensations in each axis.
+Vec3d Print::shrinkage_compensation() const
+{
+    if (!this->has_same_shrinkage_compensations())
+        return Vec3d::Ones();
+
+    const unsigned int first_extruder          = this->extruders().front();
+    const double       xy_compensation_percent = std::clamp(m_config.filament_shrinkage_compensation_xy.get_at(first_extruder), -99., 99.);
+    const double       z_compensation_percent  = std::clamp(m_config.filament_shrinkage_compensation_z.get_at(first_extruder), -99., 99.);
+    const double       xy_compensation         = 100. / (100. - xy_compensation_percent);
+    const double       z_compensation          = 100. / (100. - z_compensation_percent);
+
+    return { xy_compensation, xy_compensation, z_compensation };
+}
+
 const std::string PrintStatistics::FilamentUsedG     = "filament used [g]";
 const std::string PrintStatistics::FilamentUsedGMask = "; filament used [g] =";
 

src/libslic3r/Print.hpp

@@ -327,7 +327,7 @@ public:
     // The slicing parameters are dependent on various configuration values
     // (layer height, first layer height, raft settings, print nozzle diameter etc).
     const SlicingParameters&    slicing_parameters() const { return m_slicing_params; }
-    static SlicingParameters    slicing_parameters(const DynamicPrintConfig &full_config, const ModelObject &model_object, float object_max_z);
+    static SlicingParameters    slicing_parameters(const DynamicPrintConfig &full_config, const ModelObject &model_object, float object_max_z, const Vec3d &object_shrinkage_compensation);
 
     size_t                      num_printing_regions() const throw() { return m_shared_regions->all_regions.size(); }
     const PrintRegion&          printing_region(size_t idx) const throw() { return *m_shared_regions->all_regions[idx].get(); }
@@ -665,6 +665,12 @@ public:
     const Polygons& get_sequential_print_clearance_contours() const { return m_sequential_print_clearance_contours; }
     static bool sequential_print_horizontal_clearance_valid(const Print& print, Polygons* polygons = nullptr);
 
+    // Returns if all used filaments have same shrinkage compensations.
+    bool has_same_shrinkage_compensations() const;
+
+    // Returns scaling for each axis representing shrinkage compensations in each axis.
+    Vec3d shrinkage_compensation() const;
+
 protected:
     // Invalidates the step, and its depending steps in Print.
     bool                invalidate_step(PrintStep step);

src/libslic3r/PrintApply.cpp

@@ -134,13 +134,14 @@ struct PrintObjectTrafoAndInstances
 };
 
 // Generate a list of trafos and XY offsets for instances of a ModelObject
-static std::vector<PrintObjectTrafoAndInstances> print_objects_from_model_object(const ModelObject &model_object)
+static std::vector<PrintObjectTrafoAndInstances> print_objects_from_model_object(const ModelObject &model_object, const Vec3d &shrinkage_compensation)
 {
     std::set<PrintObjectTrafoAndInstances> trafos;
     PrintObjectTrafoAndInstances           trafo;
     for (ModelInstance *model_instance : model_object.instances)
         if (model_instance->is_printable()) {
-            trafo.trafo = model_instance->get_matrix();
+            Geometry::Transformation model_instance_transformation = model_instance->get_transformation();
+            trafo.trafo = model_instance_transformation.get_matrix_with_applied_shrinkage_compensation(shrinkage_compensation);
             auto shift = Point::new_scale(trafo.trafo.data()[12], trafo.trafo.data()[13]);
             // Reset the XY axes of the transformation.
             trafo.trafo.data()[12] = 0;
@@ -1281,7 +1282,7 @@ Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_
         // Walk over all new model objects and check, whether there are matching PrintObjects.
         for (ModelObject *model_object : m_model.objects) {
             ModelObjectStatus &model_object_status = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(*model_object));
-            model_object_status.print_instances    = print_objects_from_model_object(*model_object);
+            model_object_status.print_instances    = print_objects_from_model_object(*model_object, this->shrinkage_compensation());
             std::vector<const PrintObjectStatus*> old;
             old.reserve(print_object_status_db.count(*model_object));
             for (const PrintObjectStatus &print_object_status : print_object_status_db.get_range(*model_object))

src/libslic3r/PrintConfig.cpp

@@ -1332,6 +1332,28 @@ void PrintConfigDef::init_fff_params()
     def->set_default_value(new ConfigOptionString(L("(Unknown)")));
     def->cli = ConfigOptionDef::nocli;
 
+    def = this->add("filament_shrinkage_compensation_xy", coPercents);
+    def->label = L("Shrinkage XY");
+    def->tooltip = L("Enter your filament shrinkage percentages for the X and Y axes here to apply scaling of the object to "
+                     "compensate for shrinkage in the X and Y axes. For example, if you measured 99mm instead of 100mm, "
+                     "then you should put here 1%.");
+    def->sidetext = L("%");
+    def->mode = comAdvanced;
+    def->min = -10.;
+    def->max = 10.;
+    def->set_default_value(new ConfigOptionPercents { 0 });
+
+    def = this->add("filament_shrinkage_compensation_z", coPercents);
+    def->label = L("Shrinkage Z");
+    def->tooltip = L("Enter your filament shrinkage percentages for the Z axis here to apply scaling of the object to "
+                     "compensate for shrinkage in the Z axis. For example, if you measured 99mm instead of 100mm, "
+                     "then you should put here 1%.");
+    def->sidetext = L("%");
+    def->mode = comAdvanced;
+    def->min = -10.;
+    def->max = 10.;
+    def->set_default_value(new ConfigOptionPercents { 0. });
+
     def = this->add("fill_angle", coFloat);
     def->label = L("Fill angle");
     def->category = L("Infill");

src/libslic3r/PrintConfig.hpp

@@ -745,6 +745,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloats,              filament_multitool_ramming_flow))
     ((ConfigOptionFloats,              filament_stamping_loading_speed))
     ((ConfigOptionFloats,              filament_stamping_distance))
+    ((ConfigOptionPercents,            filament_shrinkage_compensation_xy))
+    ((ConfigOptionPercents,            filament_shrinkage_compensation_z))
     ((ConfigOptionBool,                gcode_comments))
     ((ConfigOptionEnum<GCodeFlavor>,   gcode_flavor))
     ((ConfigOptionEnum<LabelObjectsStyle>,  gcode_label_objects))

src/libslic3r/PrintObject.cpp

@@ -2620,15 +2620,14 @@ PrintRegionConfig region_config_from_model_volume(const PrintRegionConfig &defau
     return config;
 }
 
-void PrintObject::update_slicing_parameters()
-{
-    if (!m_slicing_params.valid)
-        m_slicing_params = SlicingParameters::create_from_config(
-            this->print()->config(), m_config, this->model_object()->max_z(), this->object_extruders());
+void PrintObject::update_slicing_parameters() {
+    if (!m_slicing_params.valid) {
+        m_slicing_params = SlicingParameters::create_from_config(this->print()->config(), m_config, this->model_object()->max_z(),
+                                                                 this->object_extruders(), this->print()->shrinkage_compensation());
+    }
 }
 
-SlicingParameters PrintObject::slicing_parameters(const DynamicPrintConfig& full_config, const ModelObject& model_object, float object_max_z)
-{
+SlicingParameters PrintObject::slicing_parameters(const DynamicPrintConfig &full_config, const ModelObject &model_object, float object_max_z, const Vec3d &object_shrinkage_compensation) {
 	PrintConfig         print_config;
 	PrintObjectConfig   object_config;
 	PrintRegionConfig   default_region_config;
@@ -2661,7 +2660,8 @@ SlicingParameters PrintObject::slicing_parameters(const DynamicPrintConfig& full
 
     if (object_max_z <= 0.f)
         object_max_z = (float)model_object.raw_bounding_box().size().z();
-    return SlicingParameters::create_from_config(print_config, object_config, object_max_z, object_extruders);
+
+    return SlicingParameters::create_from_config(print_config, object_config, object_max_z, object_extruders, object_shrinkage_compensation);
 }
 
 // returns 0-based indices of extruders used to print the object (without brim, support and other helper extrusions)
@@ -2682,7 +2682,6 @@ bool PrintObject::update_layer_height_profile(const ModelObject &model_object, c
     if (layer_height_profile.empty()) {
         // use the constructor because the assignement is crashing on ASAN OsX
         layer_height_profile = model_object.layer_height_profile.get();
-//        layer_height_profile = model_object.layer_height_profile;
         // The layer height returned is sampled with high density for the UI layer height painting
         // and smoothing tool to work.
         updated = true;
@@ -2693,8 +2692,9 @@ bool PrintObject::update_layer_height_profile(const ModelObject &model_object, c
         // Must not be of even length.
         ((layer_height_profile.size() & 1) != 0 ||
             // Last entry must be at the top of the object.
-            std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_parameters.object_print_z_max + slicing_parameters.object_print_z_min) > 1e-3))
+            std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_parameters.object_print_z_uncompensated_max + slicing_parameters.object_print_z_min) > 1e-3)) {
         layer_height_profile.clear();
+    }
 
     if (layer_height_profile.empty()) {
         //layer_height_profile = layer_height_profile_adaptive(slicing_parameters, model_object.layer_config_ranges, model_object.volumes);

src/libslic3r/Slicing.cpp

@@ -63,10 +63,11 @@ coordf_t Slicing::max_layer_height_from_nozzle(const DynamicPrintConfig &print_c
 }
 
 SlicingParameters SlicingParameters::create_from_config(
-	const PrintConfig 		&print_config, 
-	const PrintObjectConfig &object_config,
-	coordf_t				 object_height,
-	const std::vector<unsigned int> &object_extruders)
+	const PrintConfig 		        &print_config,
+	const PrintObjectConfig         &object_config,
+	coordf_t				         object_height,
+    const std::vector<unsigned int> &object_extruders,
+    const Vec3d                     &object_shrinkage_compensation)
 {
     assert(! print_config.first_layer_height.percent);
     coordf_t first_layer_height                      = (print_config.first_layer_height.value <= 0) ? 
@@ -85,7 +86,9 @@ SlicingParameters SlicingParameters::create_from_config(
     params.first_print_layer_height = first_layer_height;
     params.first_object_layer_height = first_layer_height;
     params.object_print_z_min = 0.;
-    params.object_print_z_max = object_height;
+    params.object_print_z_max = object_height * object_shrinkage_compensation.z();
+    params.object_print_z_uncompensated_max = object_height;
+    params.object_shrinkage_compensation_z = object_shrinkage_compensation.z();
     params.base_raft_layers = object_config.raft_layers.value;
     params.soluble_interface = soluble_interface;
 
@@ -152,6 +155,7 @@ SlicingParameters SlicingParameters::create_from_config(
         coordf_t print_z = params.raft_contact_top_z + params.gap_raft_object;
         params.object_print_z_min  = print_z;
         params.object_print_z_max += print_z;
+        params.object_print_z_uncompensated_max += print_z;
     }
 
     params.valid = true;
@@ -224,10 +228,10 @@ std::vector<coordf_t> layer_height_profile_from_ranges(
         lh_append(hi, height);
     }
 
-    if (coordf_t z = last_z(); z < slicing_params.object_print_z_height()) {
+    if (coordf_t z = last_z(); z < slicing_params.object_print_z_uncompensated_height()) {
         // Insert a step of normal layer height up to the object top.
         lh_append(z,                                      slicing_params.layer_height);
-        lh_append(slicing_params.object_print_z_height(), slicing_params.layer_height);
+        lh_append(slicing_params.object_print_z_uncompensated_height(), slicing_params.layer_height);
     }
 
    	return layer_height_profile;
@@ -418,12 +422,12 @@ void adjust_layer_height_profile(
     std::pair<coordf_t, coordf_t> z_span_variable = 
         std::pair<coordf_t, coordf_t>(
             slicing_params.first_object_layer_height_fixed() ? slicing_params.first_object_layer_height : 0.,
-            slicing_params.object_print_z_height());
+            slicing_params.object_print_z_uncompensated_height());
     if (z < z_span_variable.first || z > z_span_variable.second)
         return;
 
 	assert(layer_height_profile.size() >= 2);
-    assert(std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_params.object_print_z_height()) < EPSILON);
+    assert(std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_params.object_print_z_uncompensated_height()) < EPSILON);
 
     // 1) Get the current layer thickness at z.
     coordf_t current_layer_height = slicing_params.layer_height;
@@ -584,7 +588,7 @@ void adjust_layer_height_profile(
 	assert(layer_height_profile.size() > 2);
 	assert(layer_height_profile.size() % 2 == 0);
 	assert(layer_height_profile[0] == 0.);
-    assert(std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_params.object_print_z_height()) < EPSILON);
+    assert(std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_params.object_print_z_uncompensated_height()) < EPSILON);
 #ifdef _DEBUG
 	for (size_t i = 2; i < layer_height_profile.size(); i += 2)
 		assert(layer_height_profile[i - 2] <= layer_height_profile[i]);
@@ -613,6 +617,7 @@ std::vector<coordf_t> generate_object_layers(
         out.push_back(print_z);
     }
 
+    const coordf_t shrinkage_compensation_z = slicing_params.object_shrinkage_compensation_z;
     size_t idx_layer_height_profile = 0;
     // loop until we have at least one layer and the max slice_z reaches the object height
     coordf_t slice_z = print_z + 0.5 * slicing_params.min_layer_height;
@@ -621,17 +626,18 @@ std::vector<coordf_t> generate_object_layers(
         if (idx_layer_height_profile < layer_height_profile.size()) {
             size_t next = idx_layer_height_profile + 2;
             for (;;) {
-                if (next >= layer_height_profile.size() || slice_z < layer_height_profile[next])
+                if (next >= layer_height_profile.size() || slice_z < layer_height_profile[next] * shrinkage_compensation_z)
                     break;
                 idx_layer_height_profile = next;
                 next += 2;
             }
-            coordf_t z1 = layer_height_profile[idx_layer_height_profile];
-            coordf_t h1 = layer_height_profile[idx_layer_height_profile + 1];
+
+            const coordf_t z1 = layer_height_profile[idx_layer_height_profile] * shrinkage_compensation_z;
+            const coordf_t h1 = layer_height_profile[idx_layer_height_profile + 1];
             height = h1;
             if (next < layer_height_profile.size()) {
-                coordf_t z2 = layer_height_profile[next];
-                coordf_t h2 = layer_height_profile[next + 1];
+                const coordf_t z2 = layer_height_profile[next] * shrinkage_compensation_z;
+                const coordf_t h2 = layer_height_profile[next + 1];
                 height = lerp(h1, h2, (slice_z - z1) / (z2 - z1));
                 assert(height >= slicing_params.min_layer_height - EPSILON && height <= slicing_params.max_layer_height + EPSILON);
             }

src/libslic3r/Slicing.hpp

@@ -33,10 +33,11 @@ struct SlicingParameters
 	SlicingParameters() = default;
 
     static SlicingParameters create_from_config(
-        const PrintConfig       &print_config, 
-        const PrintObjectConfig &object_config,
-        coordf_t                 object_height,
-        const std::vector<unsigned int> &object_extruders);
+        const PrintConfig               &print_config,
+        const PrintObjectConfig         &object_config,
+        coordf_t                         object_height,
+        const std::vector<unsigned int> &object_extruders,
+        const Vec3d                     &object_shrinkage_compensation);
 
     // Has any raft layers?
     bool        has_raft() const { return raft_layers() > 0; }
@@ -46,8 +47,13 @@ struct SlicingParameters
     bool        first_object_layer_height_fixed()  const { return ! has_raft() || first_object_layer_bridging; }
 
     // Height of the object to be printed. This value does not contain the raft height.
+    // This value is scaled by shrinkage compensation in the Z-axis.
     coordf_t    object_print_z_height() const { return object_print_z_max - object_print_z_min; }
 
+    // Height of the object to be printed. This value does not contain the raft height.
+    // This value isn't scaled by shrinkage compensation in the Z-axis.
+    coordf_t    object_print_z_uncompensated_height() const { return object_print_z_uncompensated_max - object_print_z_min; }
+
     bool        valid { false };
 
     // Number of raft layers.
@@ -99,7 +105,13 @@ struct SlicingParameters
     coordf_t    raft_contact_top_z { 0 };
     // In case of a soluble interface, object_print_z_min == raft_contact_top_z, otherwise there is a gap between the raft and the 1st object layer.
     coordf_t 	object_print_z_min { 0 };
+    // This value of maximum print Z is scaled by shrinkage compensation in the Z-axis.
     coordf_t 	object_print_z_max { 0 };
+
+    // This value of maximum print Z isn't scaled by shrinkage compensation.
+    coordf_t 	object_print_z_uncompensated_max { 0 };
+    // Scaling factor for compensating shrinkage in Z-axis.
+    coordf_t    object_shrinkage_compensation_z { 0 };
 };
 static_assert(IsTriviallyCopyable<SlicingParameters>::value, "SlicingParameters class is not POD (and it should be - see constructor).");
 

src/slic3r/GUI/GLCanvas3D.cpp

@@ -628,11 +628,10 @@ void GLCanvas3D::LayersEditing::accept_changes(GLCanvas3D& canvas)
     m_layer_height_profile_modified = false;
 }
 
-void GLCanvas3D::LayersEditing::update_slicing_parameters()
-{
-	  if (m_slicing_parameters == nullptr) {
-        m_slicing_parameters = new SlicingParameters();
-        *m_slicing_parameters = PrintObject::slicing_parameters(*m_config, *m_model_object, m_object_max_z);
+void GLCanvas3D::LayersEditing::update_slicing_parameters() {
+	if (m_slicing_parameters == nullptr) {
+		m_slicing_parameters = new SlicingParameters();
+        *m_slicing_parameters = PrintObject::slicing_parameters(*m_config, *m_model_object, m_object_max_z, m_shrinkage_compensation);
     }
 }
 
@@ -1605,9 +1604,11 @@ void GLCanvas3D::set_config(const DynamicPrintConfig* config)
     m_config = config;
     m_layers_editing.set_config(config);
 
-    if (config) {
-        PrinterTechnology ptech = current_printer_technology();
+    const PrinterTechnology ptech = current_printer_technology();
+    if (const Print *print = fff_print(); ptech == ptFFF && print != nullptr)
+        m_layers_editing.set_shrinkage_compensation(fff_print()->shrinkage_compensation());
 
+    if (config) {
         auto slot = ArrangeSettingsDb_AppCfg::slotFFF;
 
         if (ptech == ptSLA) {
@@ -3200,9 +3201,9 @@ void GLCanvas3D::on_mouse_wheel(wxMouseEvent& evt)
         }
     }
 
-    // If Undo/Redo list is opened, 
+    // If Undo/Redo list is opened,
     // update them according to the event
-    if (m_undoredo_toolbar.is_item_pressed("undo")  || 
+    if (m_undoredo_toolbar.is_item_pressed("undo")  ||
         m_undoredo_toolbar.is_item_pressed("redo")) {
         m_mouse_wheel = int((double)evt.GetWheelRotation() / (double)evt.GetWheelDelta());
         return;

src/slic3r/GUI/GLCanvas3D.hpp

@@ -219,6 +219,8 @@ class GLCanvas3D
         SlicingParameters           *m_slicing_parameters{ nullptr };
         std::vector<double>         m_layer_height_profile;
         bool                        m_layer_height_profile_modified{ false };
+        // Shrinkage compensation to apply when we need to use object_max_z with Z compensation.
+        Vec3d                       m_shrinkage_compensation{ Vec3d::Ones() };
 
         mutable float               m_adaptive_quality{ 0.5f };
         mutable HeightProfileSmoothingParams m_smooth_params;
@@ -299,6 +301,8 @@ class GLCanvas3D
 
         std::pair<SlicingParameters, const std::vector<double>> get_layers_height_data();
 
+        void set_shrinkage_compensation(const Vec3d &shrinkage_compensation) { m_shrinkage_compensation = shrinkage_compensation; };
+
     private:
         bool is_initialized() const;
         void generate_layer_height_texture();

src/slic3r/GUI/Plater.cpp

@@ -1938,6 +1938,10 @@ void Plater::priv::process_validation_warning(const std::vector<std::string>& wa
         if (text == "_BED_TEMPS_DIFFER")
             text = _u8L("Bed temperatures for the used filaments differ significantly.");
 
+        if (text == "_FILAMENT_SHRINKAGE_DIFFER")
+            text = _u8L("Filament shrinkage will not be used because filament shrinkage "
+                        "for the used filaments differs significantly.");
+
         notification_manager->push_notification(
             NotificationType::ValidateWarning,
             NotificationManager::NotificationLevel::WarningNotificationLevel,

src/slic3r/GUI/Tab.cpp

@@ -2237,6 +2237,10 @@ void TabFilament::build()
         };
         optgroup->append_line(line);
 
+        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");
+
         optgroup = page->new_optgroup(L("Wipe tower parameters"));
         optgroup->append_single_option_line("filament_minimal_purge_on_wipe_tower");