diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index 17b783269..7729b6126 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -163,6 +163,7 @@ sub thread_cleanup {
     *Slic3r::Surface::Collection::DESTROY   = sub {};
     *Slic3r::Print::SupportMaterial2::DESTROY = sub {};
     *Slic3r::TriangleMesh::DESTROY          = sub {};
+    *Slic3r::GUI::PresetBundle::DESTROY     = sub {};
     return undef;  # this prevents a "Scalars leaked" warning
 }
 
diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index 759030ec5..dc93e513f 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -172,6 +172,7 @@ sub OnInit {
         }
     }
     $self->{mainframe}->config_wizard if $run_wizard;
+    eval { $self->{preset_bundle}->load_presets($datadir) };
     
 #    $self->check_version
 #        if $self->have_version_check
diff --git a/xs/src/libslic3r/Config.cpp b/xs/src/libslic3r/Config.cpp
index 4ece56499..db46c7d59 100644
--- a/xs/src/libslic3r/Config.cpp
+++ b/xs/src/libslic3r/Config.cpp
@@ -188,7 +188,8 @@ void ConfigBase::apply(const ConfigBase &other, const t_config_option_keys &keys
             continue;
         }
         // not the most efficient way, but easier than casting pointers to subclasses
-        if (! my_opt->deserialize(other.option(key)->serialize()))
+		const ConfigOption *other_opt = other.option(key);
+        if (other_opt != nullptr && ! my_opt->deserialize(other_opt->serialize()))
             CONFESS((std::string("Unexpected failure when deserializing serialized value for ") + key).c_str());
     }
 }
diff --git a/xs/src/slic3r/GUI/Preset.cpp b/xs/src/slic3r/GUI/Preset.cpp
index 3aa051d1c..ea48cd1f5 100644
--- a/xs/src/slic3r/GUI/Preset.cpp
+++ b/xs/src/slic3r/GUI/Preset.cpp
@@ -1,11 +1,20 @@
 #include "Preset.hpp"
 
 #include <fstream>
+#include <boost/filesystem.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 
 #include <wx/image.h>
 #include <wx/bmpcbox.h>
 
+#if 0
+#define DEBUG
+#define _DEBUG
+#undef NDEBUG
+#endif
+
+#include <assert.h>
+
 namespace Slic3r {
 
 // Load a config file, return a C++ class Slic3r::DynamicPrintConfig with $keys initialized from the config file.
@@ -67,6 +76,28 @@ PresetCollection::PresetCollection(Preset::Type type, const std::vector<std::str
     m_presets.front().load(keys);
 }
 
+// Load all presets found in dir_path.
+// Throws an exception on error.
+void PresetCollection::load_presets(const std::string &dir_path, const std::string &subdir)
+{
+    m_presets.erase(m_presets.begin()+1, m_presets.end());
+    t_config_option_keys keys = this->default_preset().config.keys();
+	for (auto &file : boost::filesystem::directory_iterator(boost::filesystem::canonical(boost::filesystem::path(dir_path) / subdir).make_preferred()))
+        if (boost::filesystem::is_regular_file(file.status()) && boost::algorithm::iends_with(file.path().filename().string(), ".ini")) {
+            std::string name = file.path().filename().string();
+            // Remove the .ini suffix.
+            name.erase(name.size() - 4);
+            try {
+                Preset preset(m_type, name, false);
+                preset.file = file.path().string();
+                preset.load(keys);
+                m_presets.emplace_back(preset);
+            } catch (const boost::filesystem::filesystem_error &err) {
+
+            }
+        }
+}
+
 void PresetCollection::set_default_suppressed(bool default_suppressed)
 {
     if (m_default_suppressed != default_suppressed) {
@@ -162,12 +193,23 @@ PresetBundle::PresetBundle() :
 
 PresetBundle::~PresetBundle()
 {
-    delete m_bitmapCompatible;
+	assert(m_bitmapCompatible != nullptr);
+	assert(m_bitmapIncompatible != nullptr);
+	delete m_bitmapCompatible;
+	m_bitmapCompatible = nullptr;
     delete m_bitmapIncompatible;
+	m_bitmapIncompatible = nullptr;
     for (std::pair<const std::string, wxBitmap*> &bitmap : m_mapColorToBitmap)
         delete bitmap.second;
 }
 
+void PresetBundle::load_presets(const std::string &dir_path)
+{
+    this->prints.load_presets(dir_path, "print");
+    this->prints.load_presets(dir_path, "filament");
+    this->prints.load_presets(dir_path, "printer");
+}
+
 bool PresetBundle::load_bitmaps(const std::string &path_bitmap_compatible, const std::string &path_bitmap_incompatible)
 {
     bool loaded_compatible   = m_bitmapCompatible  ->LoadFile(wxString::FromUTF8(path_bitmap_compatible.c_str()));
diff --git a/xs/src/slic3r/GUI/Preset.hpp b/xs/src/slic3r/GUI/Preset.hpp
index cd4bdfdf6..5c8ec8106 100644
--- a/xs/src/slic3r/GUI/Preset.hpp
+++ b/xs/src/slic3r/GUI/Preset.hpp
@@ -66,6 +66,9 @@ public:
     // Initialize the PresetCollection with the "- default -" preset.
     PresetCollection(Preset::Type type, const std::vector<std::string> &keys);
 
+    // Load ini files of the particular type from the provided directory path.
+    void            load_presets(const std::string &dir_path, const std::string &subdir);
+
     // Compatible & incompatible marks, to be placed at the wxBitmapComboBox items.
     void            set_bitmap_compatible  (const wxBitmap *bmp) { m_bitmap_compatible   = bmp; }
     void            set_bitmap_incompatible(const wxBitmap *bmp) { m_bitmap_incompatible = bmp; }
@@ -120,7 +123,10 @@ public:
     PresetBundle();
     ~PresetBundle();
 
-    bool load_bitmaps(const std::string &path_bitmap_compatible, const std::string &path_bitmap_incompatible);
+    bool            load_bitmaps(const std::string &path_bitmap_compatible, const std::string &path_bitmap_incompatible);
+
+    // Load ini files of all types (print, filament, printer) from the provided directory path.
+    void            load_presets(const std::string &dir_path);
 
     PresetCollection        prints;
     PresetCollection        filaments;
diff --git a/xs/xsp/GUI_Preset.xsp b/xs/xsp/GUI_Preset.xsp
index f32a07d58..c6d97cabd 100644
--- a/xs/xsp/GUI_Preset.xsp
+++ b/xs/xsp/GUI_Preset.xsp
@@ -51,6 +51,9 @@ PresetCollection::arrayref()
     PresetBundle();
     ~PresetBundle();
 
+    void                  load_bitmaps(std::string path_bitmap_compatible, std::string path_bitmap_incompatible);
+    void                  load_presets(std::string dir_path);
+
     Ref<PresetCollection> prints()    %code%{ RETVAL = &THIS->prints;   %};
     Ref<PresetCollection> filaments() %code%{ RETVAL = &THIS->filaments; %};
     Ref<PresetCollection> printers()  %code%{ RETVAL = &THIS->printers;  %};