diff --git a/src/slic3r/GUI/DoubleSlider.cpp b/src/slic3r/GUI/DoubleSlider.cpp
index 9dc6c5c741..de7a944f24 100644
--- a/src/slic3r/GUI/DoubleSlider.cpp
+++ b/src/slic3r/GUI/DoubleSlider.cpp
@@ -2022,6 +2022,9 @@ void Control::auto_color_change()
             Layer* layer = object->get_layer(i);
             double cur_area = area(layer->lslices);
 
+            if (cur_area > prev_area)
+                break;
+
             if (prev_area - cur_area > delta_area) {
                 int tick = get_tick_from_value(layer->print_z);
                 if (tick >= 0 && !m_ticks.has_tick(tick)) {
@@ -2035,6 +2038,10 @@ void Control::auto_color_change()
                             extruder = 1;
                     }
                 }
+
+                // allow max 3 auto color changes
+                if (m_ticks.ticks.size() == 3)
+                    break;
             }
 
             prev_area = cur_area;
diff --git a/src/slic3r/GUI/GUI_Preview.cpp b/src/slic3r/GUI/GUI_Preview.cpp
index 244ef52d3c..0042c0702c 100644
--- a/src/slic3r/GUI/GUI_Preview.cpp
+++ b/src/slic3r/GUI/GUI_Preview.cpp
@@ -645,23 +645,24 @@ void Preview::update_layers_slider(const std::vector<double>& layers_z, bool kee
     // Suggest the auto color change, if model looks like sign
     if (m_layers_slider->IsNewPrint())
     {
-        NotificationManager* notif_mngr = wxGetApp().plater()->get_notification_manager();
-
         const Print& print = wxGetApp().plater()->fff_print();
         double delta_area = scale_(scale_(25)); // equal to 25 mm2
 
         //bool is_possible_auto_color_change = false;
         for (auto object : print.objects()) {
+            // bottom layer have to be a biggest, so control relation between bottom lazer and object size
+            const ExPolygons& bottom = object->get_layer(0)->lslices;
+            double bottom_area = area(bottom);
+            if (bottom_area < double(object->size().x()) * double(object->size().y()))
+                continue;
+
+            // if it's sign, than object have not to be a too height
             double height = object->height();
             coord_t longer_side = std::max(object->size().x(), object->size().y());
             if (height / longer_side > 0.3)
                 continue;
 
-            const ExPolygons& bottom = object->get_layer(0)->lslices;
-            //if (bottom.size() > 1 || !bottom[0].holes.empty())
-            //    continue;
-
-            double bottom_area = area(bottom);
+            // at least 30% of object's height have to be a solid 
             int i;
             for (i = 1; i < int(0.3 * object->layers().size()); i++)
                 if (area(object->get_layer(1)->lslices) != bottom_area)
@@ -671,6 +672,7 @@ void Preview::update_layers_slider(const std::vector<double>& layers_z, bool kee
 
             double top_area = area(object->get_layer(int(object->layers().size()) - 1)->lslices);
             if( bottom_area - top_area > delta_area) {
+                NotificationManager* notif_mngr = wxGetApp().plater()->get_notification_manager();
                 notif_mngr->push_notification(
                     NotificationType::SignDetected, NotificationManager::NotificationLevel::RegularNotification,
                     _u8L("NOTE:") + "\n" + _u8L("Sliced object looks like the sign") + "\n",
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 33dc544441..6916c04a54 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -1443,7 +1443,7 @@ void TabPrint::build()
 
         optgroup = page->new_optgroup(L("Fuzzy skin (experimental)"));
         Option option = optgroup->get_option("fuzzy_skin");
-        option.opt.width = 30;
+//        option.opt.width = 30;
         optgroup->append_single_option_line(option);
         optgroup->append_single_option_line(optgroup->get_option("fuzzy_skin_thickness"));
         optgroup->append_single_option_line(optgroup->get_option("fuzzy_skin_point_dist"));