diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 1ce00f269d..78dd60a4b9 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -2392,6 +2392,7 @@ void PrintConfigDef::init_sla_params()
                       "the threshold in the middle. This behaviour eliminates "
                       "antialiasing without losing holes in polygons.");
     def->min = 0;
+    def->max = 1;
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionFloat(1.0));
 
diff --git a/src/slic3r/GUI/ConfigManipulation.cpp b/src/slic3r/GUI/ConfigManipulation.cpp
index c9cdff1628..9ca08809b0 100644
--- a/src/slic3r/GUI/ConfigManipulation.cpp
+++ b/src/slic3r/GUI/ConfigManipulation.cpp
@@ -354,8 +354,7 @@ void ConfigManipulation::toggle_print_sla_options(DynamicPrintConfig* config)
     toggle_field("pad_wall_slope", pad_en);
     toggle_field("pad_around_object", pad_en);
 
-    bool has_suppad = pad_en && supports_en;
-    bool zero_elev = config->opt_bool("pad_around_object") && has_suppad;
+    bool zero_elev = config->opt_bool("pad_around_object") && pad_en;
 
     toggle_field("support_object_elevation", supports_en && !zero_elev);
     toggle_field("pad_object_gap", zero_elev);
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 803a5cf082..d3f331442f 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -1808,7 +1808,10 @@ void TabPrinter::build_fff()
         optgroup->append_single_option_line("single_extruder_multi_material");
 
         optgroup->m_on_change = [this, optgroup](t_config_option_key opt_key, boost::any value) {
-            size_t extruders_count = boost::any_cast<size_t>(optgroup->get_value("extruders_count"));
+            // optgroup->get_value() return int for def.type == coInt,
+            // Thus, there should be boost::any_cast<int> !
+            // Otherwise, boost::any_cast<size_t> causes an "unhandled unknown exception"
+            size_t extruders_count = size_t(boost::any_cast<int>(optgroup->get_value("extruders_count")));
             wxTheApp->CallAfter([this, opt_key, value, extruders_count]() {
                 if (opt_key == "extruders_count" || opt_key == "single_extruder_multi_material") {
                     extruders_count_changed(extruders_count);