diff --git a/src/libslic3r/Config.hpp b/src/libslic3r/Config.hpp
index 09d283a327..d8afe8e021 100644
--- a/src/libslic3r/Config.hpp
+++ b/src/libslic3r/Config.hpp
@@ -25,6 +25,7 @@
 #include <assert.h>
 #include <map>
 #include <climits>
+#include <limits>
 #include <cstdio>
 #include <cstdlib>
 #include <functional>
@@ -320,7 +321,7 @@ typedef ConfigOption*       ConfigOptionPtr;
 typedef const ConfigOption* ConfigOptionConstPtr;
 
 // Value of a single valued option (bool, int, float, string, point, enum)
-template <class T>
+template <class T, bool NULLABLE = false>
 class ConfigOptionSingle : public ConfigOption {
 public:
     T value;
@@ -349,6 +350,49 @@ public:
 
     size_t hash() const throw() override { return std::hash<T>{}(this->value); }
 
+    // Is this option overridden by another option?
+    // An option overrides another option if it is not nil and not equal.
+    bool overriden_by(const ConfigOption *rhs) const override {
+        if (this->nullable())
+            throw ConfigurationError("Cannot override a nullable ConfigOption.");
+        if (rhs->type() != this->type())
+            throw ConfigurationError("ConfigOptionVector.overriden_by() applied to different types.");
+        auto rhs_vec = static_cast<const ConfigOptionSingle<T>*>(rhs);
+        if (! rhs->nullable())
+            // Overridding a non-nullable object with another non-nullable object.
+            return this->value != rhs_vec->value;
+
+        return false;
+    }
+    // Apply an override option, possibly a nullable one.
+    bool apply_override(const ConfigOption *rhs) override {
+        if (this->nullable())
+            throw ConfigurationError("Cannot override a nullable ConfigOption.");
+        if (rhs->type() != this->type())
+            throw ConfigurationError("ConfigOptionVector.apply_override() applied to different types.");
+        auto rhs_vec = static_cast<const ConfigOptionSingle<T>*>(rhs);
+        if (! rhs->nullable()) {
+            // Overridding a non-nullable object with another non-nullable object.
+            if (this->value != rhs_vec->value) {
+                this->value = rhs_vec->value;
+                return true;
+            }
+            return false;
+        }
+
+        return false;
+    }
+
+    bool nullable() const override { return NULLABLE; }
+
+    static T nil_value() { return std::numeric_limits<T>::min(); }
+
+    // A scalar is nil, or all values of a vector are nil.
+    bool is_nil() const override
+    {
+        return this->value == nil_value();
+    }
+
 private:
 	friend class cereal::access;
 	template<class Archive> void serialize(Archive & ar) { ar(this->value); }
@@ -572,18 +616,19 @@ private:
 	template<class Archive> void serialize(Archive & ar) { ar(this->values); }
 };
 
-class ConfigOptionFloat : public ConfigOptionSingle<double>
+template<bool NULLABLE = false>
+class ConfigOptionFloatTempl : public ConfigOptionSingle<double, NULLABLE>
 {
 public:
-    ConfigOptionFloat() : ConfigOptionSingle<double>(0) {}
-    explicit ConfigOptionFloat(double _value) : ConfigOptionSingle<double>(_value) {}
+    ConfigOptionFloatTempl() : ConfigOptionSingle<double, NULLABLE>(0) {}
+    explicit ConfigOptionFloatTempl(double _value) : ConfigOptionSingle<double, NULLABLE>(_value) {}
 
     static ConfigOptionType static_type() { return coFloat; }
     ConfigOptionType        type()      const override { return static_type(); }
     double                  getFloat()  const override { return this->value; }
-    ConfigOption*           clone()     const override { return new ConfigOptionFloat(*this); }
-    bool                    operator==(const ConfigOptionFloat &rhs) const throw() { return this->value == rhs.value; }
-    bool                    operator< (const ConfigOptionFloat &rhs) const throw() { return this->value <  rhs.value; }
+    ConfigOption*           clone()     const override { return new ConfigOptionFloatTempl(*this); }
+    bool                    operator==(const ConfigOptionFloatTempl &rhs) const throw() { return this->value == rhs.value; }
+    bool                    operator< (const ConfigOptionFloatTempl &rhs) const throw() { return this->value <  rhs.value; }
     
     std::string serialize() const override
     {
@@ -600,7 +645,7 @@ public:
         return !iss.fail();
     }
 
-    ConfigOptionFloat& operator=(const ConfigOption *opt)
+    ConfigOptionFloatTempl& operator=(const ConfigOption *opt)
     {   
         this->set(opt);
         return *this;
@@ -734,6 +779,8 @@ private:
 	template<class Archive> void serialize(Archive &ar) { ar(cereal::base_class<ConfigOptionVector<double>>(this)); }
 };
 
+using ConfigOptionFloat = ConfigOptionFloatTempl<false>;
+using ConfigOptionFloatNullable  = ConfigOptionFloatTempl<true>;
 using ConfigOptionFloats 		 = ConfigOptionFloatsTempl<false>;
 using ConfigOptionFloatsNullable = ConfigOptionFloatsTempl<true>;
 
diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index f8fef6ac7b..f0443fd72f 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -8,6 +8,7 @@
 #include "CSGMesh/CSGMeshCopy.hpp"
 #include "CSGMesh/PerformCSGMeshBooleans.hpp"
 #include "format.hpp"
+#include "StaticMap.hpp"
 
 #include "Format/SLAArchiveFormatRegistry.hpp"
 
@@ -202,6 +203,51 @@ std::vector<ObjectID> SLAPrint::print_object_ids() const
     return out;
 }
 
+static t_config_option_keys print_config_diffs(const SLAPrintObjectConfig     &current_config,
+                                               const DynamicPrintConfig &new_full_config,
+                                               DynamicPrintConfig       &material_overrides)
+{
+    using namespace std::string_view_literals;
+
+    static const constexpr StaticSet overriden_keys = {
+        "support_pillar_diameter"sv
+    };
+
+    static constexpr auto material_ow_prefix = "material_ow_";
+
+    t_config_option_keys           print_diff;
+    for (const t_config_option_key &opt_key : current_config.keys()) {
+        const ConfigOption *opt_old = current_config.option(opt_key);
+        assert(opt_old != nullptr);
+        const ConfigOption *opt_new = new_full_config.option(opt_key);
+        // assert(opt_new != nullptr);
+        if (opt_new == nullptr)
+            //FIXME This may happen when executing some test cases.
+            continue;
+        const ConfigOption *opt_new_override = std::binary_search(overriden_keys.begin(), overriden_keys.end(), opt_key) ? new_full_config.option(material_ow_prefix + opt_key) : nullptr;
+        if (opt_new_override != nullptr && ! opt_new_override->is_nil()) {
+            // An override is available at some of the material presets.
+            bool overriden = opt_new->overriden_by(opt_new_override);
+            if (overriden || *opt_old != *opt_new) {
+                auto opt_copy = opt_new->clone();
+                opt_copy->apply_override(opt_new_override);
+                bool changed = *opt_old != *opt_copy;
+                if (changed)
+                    print_diff.emplace_back(opt_key);
+                if (changed || overriden) {
+                    // overrides will be applied to the placeholder parser, which layers these parameters over full_print_config.
+                    material_overrides.set_key_value(opt_key, opt_copy);
+                } else
+                    delete opt_copy;
+            }
+        } else if (*opt_new != *opt_old)
+            print_diff.emplace_back(opt_key);
+    }
+
+    return print_diff;
+}
+
+
 SLAPrint::ApplyStatus SLAPrint::apply(const Model &model, DynamicPrintConfig config)
 {
 #ifdef _DEBUG
@@ -737,66 +783,68 @@ void SLAPrint::process()
 
 bool SLAPrint::invalidate_state_by_config_options(const std::vector<t_config_option_key> &opt_keys, bool &invalidate_all_model_objects)
 {
+    using namespace std::string_view_literals;
+
     if (opt_keys.empty())
         return false;
 
-    static std::unordered_set<std::string> steps_full = {
-        "initial_layer_height",
-        "material_correction",
-        "material_correction_x",
-        "material_correction_y",
-        "material_correction_z",
-        "material_print_speed",
-        "relative_correction",
-        "relative_correction_x",
-        "relative_correction_y",
-        "relative_correction_z",
-        "absolute_correction",
-        "elefant_foot_compensation",
-        "elefant_foot_min_width",
-        "gamma_correction"
+    static constexpr StaticSet steps_full = {
+        "initial_layer_height"sv,
+        "material_correction"sv,
+        "material_correction_x"sv,
+        "material_correction_y"sv,
+        "material_correction_z"sv,
+        "material_print_speed"sv,
+        "relative_correction"sv,
+        "relative_correction_x"sv,
+        "relative_correction_y"sv,
+        "relative_correction_z"sv,
+        "absolute_correction"sv,
+        "elefant_foot_compensation"sv,
+        "elefant_foot_min_width"sv,
+        "gamma_correction"sv
     };
 
     // Cache the plenty of parameters, which influence the final rasterization only,
     // or they are only notes not influencing the rasterization step.
-    static std::unordered_set<std::string> steps_rasterize = {
-        "min_exposure_time",
-        "max_exposure_time",
-        "exposure_time",
-        "min_initial_exposure_time",
-        "max_initial_exposure_time",
-        "initial_exposure_time",
-        "display_width",
-        "display_height",
-        "display_pixels_x",
-        "display_pixels_y",
-        "display_mirror_x",
-        "display_mirror_y",
-        "display_orientation",
-        "sla_archive_format",
-        "sla_output_precision"
+    static constexpr StaticSet steps_rasterize = {
+        "min_exposure_time"sv,
+        "max_exposure_time"sv,
+        "exposure_time"sv,
+        "min_initial_exposure_time"sv,
+        "max_initial_exposure_time"sv,
+        "initial_exposure_time"sv,
+        "display_width"sv,
+        "display_height"sv,
+        "display_pixels_x"sv,
+        "display_pixels_y"sv,
+        "display_mirror_x"sv,
+        "display_mirror_y"sv,
+        "display_orientation"sv,
+        "sla_archive_format"sv,
+        "sla_output_precision"sv
     };
 
-    static std::unordered_set<std::string> steps_ignore = {
-        "bed_shape",
-        "max_print_height",
-        "printer_technology",
-        "output_filename_format",
-        "fast_tilt_time",
-        "slow_tilt_time",
-        "high_viscosity_tilt_time",
-        "area_fill",
-        "bottle_cost",
-        "bottle_volume",
-        "bottle_weight",
-        "material_density"
+    static StaticSet steps_ignore = {
+        "bed_shape"sv,
+        "max_print_height"sv,
+        "printer_technology"sv,
+        "output_filename_format"sv,
+        "fast_tilt_time"sv,
+        "slow_tilt_time"sv,
+        "high_viscosity_tilt_time"sv,
+        "area_fill"sv,
+        "bottle_cost"sv,
+        "bottle_volume"sv,
+        "bottle_weight"sv,
+        "material_density"sv
     };
 
     std::vector<SLAPrintStep> steps;
     std::vector<SLAPrintObjectStep> osteps;
     bool invalidated = false;
 
-    for (const t_config_option_key &opt_key : opt_keys) {
+    for (std::string_view opt_key : opt_keys) {
         if (steps_rasterize.find(opt_key) != steps_rasterize.end()) {
             // These options only affect the final rasterization, or they are just notes without influence on the output,
             // so there is nothing to invalidate.