diff --git a/xs/MANIFEST b/xs/MANIFEST
index b3f0d64f8e..754b9f025e 100644
--- a/xs/MANIFEST
+++ b/xs/MANIFEST
@@ -60,6 +60,7 @@ t/11_clipper.t
 t/12_extrusionpathcollection.t
 t/13_polylinecollection.t
 t/14_geometry.t
+t/15_config.t
 xsp/Clipper.xsp
 xsp/Config.xsp
 xsp/ExPolygon.xsp
diff --git a/xs/src/Config.cpp b/xs/src/Config.cpp
index 7646440124..16bd56cf4e 100644
--- a/xs/src/Config.cpp
+++ b/xs/src/Config.cpp
@@ -5,6 +5,13 @@ namespace Slic3r {
 t_optiondef_map Options = _build_optiondef_map();
 FullConfig DefaultConfig = _build_default_config();
 
+ConfigOptionDef*
+get_config_option_def(const t_config_option_key opt_key) {
+    t_optiondef_map::iterator it = Options.find(opt_key);
+    if (it == Options.end()) return NULL;
+    return &it->second;
+}
+
 void
 ConfigBase::apply(ConfigBase &other, bool ignore_nonexistent) {
     // get list of option keys to apply
@@ -19,25 +26,112 @@ ConfigBase::apply(ConfigBase &other, bool ignore_nonexistent) {
     }
 }
 
+std::string
+ConfigBase::serialize(const t_config_option_key opt_key) {
+    ConfigOption* opt = this->option(opt_key);
+    assert(opt != NULL);
+    return opt->serialize();
+}
+
+void
+ConfigBase::set_deserialize(const t_config_option_key opt_key, std::string str) {
+    ConfigOption* opt = this->option(opt_key);
+    assert(opt != NULL);
+    opt->deserialize(str);
+}
+
+float
+ConfigBase::get_abs_value(const t_config_option_key opt_key) {
+    // get option definition
+    ConfigOptionDef* def = get_config_option_def(opt_key);
+    assert(def != NULL);
+    assert(def->type == coFloatOrPercent);
+    
+    // get stored option value
+    ConfigOptionFloatOrPercent* opt = dynamic_cast<ConfigOptionFloatOrPercent*>(this->option(opt_key));
+    assert(opt != NULL);
+    
+    // compute absolute value
+    if (opt->percent) {
+        ConfigOptionFloat* optbase = dynamic_cast<ConfigOptionFloat*>(this->option(def->ratio_over));
+        assert(optbase != NULL);
+        return optbase->value * opt->value / 100;
+    } else {
+        return opt->value;
+    }
+}
+
 #ifdef SLIC3RXS
 SV*
 ConfigBase::get(t_config_option_key opt_key) {
     ConfigOption* opt = this->option(opt_key);
     if (opt == NULL) return &PL_sv_undef;
-    if (ConfigOptionFloat* v = dynamic_cast<ConfigOptionFloat*>(opt)) {
-        return newSVnv(v->value);
-    } else if (ConfigOptionInt* v = dynamic_cast<ConfigOptionInt*>(opt)) {
-        return newSViv(v->value);
+    if (ConfigOptionFloat* optv = dynamic_cast<ConfigOptionFloat*>(opt)) {
+        return newSVnv(optv->value);
+    } else if (ConfigOptionInt* optv = dynamic_cast<ConfigOptionInt*>(opt)) {
+        return newSViv(optv->value);
+    } else if (ConfigOptionString* optv = dynamic_cast<ConfigOptionString*>(opt)) {
+        // we don't serialize() because that would escape newlines
+        return newSVpvn(optv->value.c_str(), optv->value.length());
+    } else if (ConfigOptionPoint* optv = dynamic_cast<ConfigOptionPoint*>(opt)) {
+        return optv->point.to_SV_pureperl();
     } else {
-        throw "Unknown option value type";
+        std::string serialized = opt->serialize();
+        return newSVpvn(serialized.c_str(), serialized.length());
+    }
+}
+
+void
+ConfigBase::set(t_config_option_key opt_key, SV* value) {
+    ConfigOption* opt = this->option(opt_key, true);
+    assert(opt != NULL);
+    
+    if (ConfigOptionFloat* optv = dynamic_cast<ConfigOptionFloat*>(opt)) {
+        optv->value = SvNV(value);
+    } else if (ConfigOptionInt* optv = dynamic_cast<ConfigOptionInt*>(opt)) {
+        optv->value = SvIV(value);
+    } else if (ConfigOptionString* optv = dynamic_cast<ConfigOptionString*>(opt)) {
+        optv->value = std::string(SvPV_nolen(value), SvCUR(value));
+    } else if (ConfigOptionPoint* optv = dynamic_cast<ConfigOptionPoint*>(opt)) {
+        optv->point.from_SV(value);
+    } else {
+        opt->deserialize( std::string(SvPV_nolen(value)) );
     }
 }
 #endif
 
+DynamicConfig::~DynamicConfig () {
+    for (t_options_map::iterator it = this->options.begin(); it != this->options.end(); ++it) {
+        ConfigOption* opt = it->second;
+        if (opt != NULL) delete opt;
+    }
+}
+
 ConfigOption*
-DynamicConfig::option(const t_config_option_key opt_key) {
+DynamicConfig::option(const t_config_option_key opt_key, bool create) {
     t_options_map::iterator it = this->options.find(opt_key);
-    if (it == this->options.end()) return NULL;
+    if (it == this->options.end()) {
+        if (create) {
+            ConfigOption* opt;
+            if (Options[opt_key].type == coFloat) {
+                opt = new ConfigOptionFloat ();
+            } else if (Options[opt_key].type == coInt) {
+                opt = new ConfigOptionInt ();
+            } else if (Options[opt_key].type == coString) {
+                opt = new ConfigOptionString ();
+            } else if (Options[opt_key].type == coFloatOrPercent) {
+                opt = new ConfigOptionFloatOrPercent ();
+            } else if (Options[opt_key].type == coPoint) {
+                opt = new ConfigOptionPoint ();
+            } else {
+                throw "Unknown option type";
+            }
+            this->options[opt_key] = opt;
+            return opt;
+        } else {
+            return NULL;
+        }
+    }
     return it->second;
 }
 
diff --git a/xs/src/Config.hpp b/xs/src/Config.hpp
index 275a33a3ef..0bb483dc69 100644
--- a/xs/src/Config.hpp
+++ b/xs/src/Config.hpp
@@ -3,8 +3,13 @@
 
 #include <myinit.h>
 #include <map>
+#include <sstream>
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>;
 #include <string>
 #include <vector>
+#include "Point.hpp"
 
 namespace Slic3r {
 
@@ -14,27 +19,79 @@ typedef std::vector<std::string> t_config_option_keys;
 class ConfigOption {
     public:
     virtual ~ConfigOption() {};
+    virtual std::string serialize() = 0;
+    virtual void deserialize(std::string str) = 0;
 };
 
 class ConfigOptionFloat : public ConfigOption
 {
     public:
     float value;
+    ConfigOptionFloat() : value(0) {};
+    
     operator float() const { return this->value; };
+    
+    std::string serialize() {
+        std::ostringstream ss;
+        ss << this->value;
+        return ss.str();
+    };
+    
+    void deserialize(std::string str) {
+        this->value = ::atof(str.c_str());
+    };
 };
 
 class ConfigOptionInt : public ConfigOption
 {
     public:
     int value;
+    ConfigOptionInt() : value(0) {};
+    
     operator int() const { return this->value; };
+    
+    std::string serialize() {
+        std::ostringstream ss;
+        ss << this->value;
+        return ss.str();
+    };
+    
+    void deserialize(std::string str) {
+        this->value = ::atoi(str.c_str());
+    };
 };
 
 class ConfigOptionString : public ConfigOption
 {
     public:
     std::string value;
+    ConfigOptionString() : value("") {};
+    
     operator std::string() const { return this->value; };
+    
+    std::string serialize() {
+        std::string str = this->value;
+        
+        // s/\R/\\n/g
+        size_t pos = 0;
+        while ((pos = str.find("\n", pos)) != std::string::npos || (pos = str.find("\r", pos)) != std::string::npos) {
+            str.replace(pos, 1, "\\n");
+            pos += 2; // length of "\\n"
+        }
+        
+        return str; 
+    };
+    
+    void deserialize(std::string str) {
+        // s/\\n/\n/g
+        size_t pos = 0;
+        while ((pos = str.find("\\n", pos)) != std::string::npos) {
+            str.replace(pos, 2, "\n");
+            pos += 1; // length of "\n"
+        }
+        
+        this->value = str;
+    };
 };
 
 class ConfigOptionFloatOrPercent : public ConfigOption
@@ -42,6 +99,44 @@ class ConfigOptionFloatOrPercent : public ConfigOption
     public:
     float value;
     bool percent;
+    ConfigOptionFloatOrPercent() : value(0), percent(false) {};
+    
+    std::string serialize() {
+        std::ostringstream ss;
+        ss << this->value;
+        std::string s(ss.str());
+        if (this->percent) s += "%";
+        return s;
+    };
+    
+    void deserialize(std::string str) {
+        if (str.find_first_of("%") != std::string::npos) {
+            sscanf(str.c_str(), "%f%%", &this->value);
+            this->percent = true;
+        } else {
+            this->value = ::atof(str.c_str());
+            this->percent = false;
+        }
+    };
+};
+
+class ConfigOptionPoint : public ConfigOption
+{
+    public:
+    Pointf point;
+    ConfigOptionPoint() : point(Pointf(0,0)) {};
+    
+    std::string serialize() {
+        std::ostringstream ss;
+        ss << this->point.x;
+        ss << ",";
+        ss << this->point.y;
+        return ss.str();
+    };
+    
+    void deserialize(std::string str) {
+        sscanf(str.c_str(), "%f%*1[,x]%f", &this->point.x, &this->point.y);
+    };
 };
 
 enum ConfigOptionType {
@@ -49,6 +144,7 @@ enum ConfigOptionType {
     coInt,
     coString,
     coFloatOrPercent,
+    coPoint,
 };
 
 class ConfigOptionDef
@@ -57,30 +153,41 @@ class ConfigOptionDef
     ConfigOptionType type;
     std::string label;
     std::string tooltip;
+    std::string ratio_over;
 };
 
 typedef std::map<t_config_option_key,ConfigOptionDef> t_optiondef_map;
 
+ConfigOptionDef* get_config_option_def(const t_config_option_key opt_key);
+
 class ConfigBase
 {
     public:
-    virtual ConfigOption* option(const t_config_option_key opt_key) = 0;
+    virtual ConfigOption* option(const t_config_option_key opt_key, bool create = false) = 0;
     virtual void keys(t_config_option_keys *keys) = 0;
     void apply(ConfigBase &other, bool ignore_nonexistent = false);
+    std::string serialize(const t_config_option_key opt_key);
+    void set_deserialize(const t_config_option_key opt_key, std::string str);
+    float get_abs_value(const t_config_option_key opt_key);
     
     #ifdef SLIC3RXS
     SV* get(t_config_option_key opt_key);
+    void set(t_config_option_key opt_key, SV* value);
     #endif
 };
 
 class DynamicConfig : public ConfigBase
 {
     public:
-    ConfigOption* option(const t_config_option_key opt_key);
+    DynamicConfig() {};
+    ~DynamicConfig();
+    ConfigOption* option(const t_config_option_key opt_key, bool create = false);
     void keys(t_config_option_keys *keys);
     bool has(const t_config_option_key opt_key) const;
     
     private:
+    DynamicConfig(const DynamicConfig& other);              // we disable this by making it private and unimplemented
+    DynamicConfig& operator= (const DynamicConfig& other);  // we disable this by making it private and unimplemented
     typedef std::map<t_config_option_key,ConfigOption*> t_options_map;
     t_options_map options;
 };
@@ -96,10 +203,19 @@ class FullConfig : public StaticConfig
     public:
     ConfigOptionFloat layer_height;
     ConfigOptionFloatOrPercent first_layer_height;
+    ConfigOptionInt perimeters;
+    ConfigOptionString extrusion_axis;
+    ConfigOptionPoint print_center;
+    ConfigOptionString notes;
     
-    ConfigOption* option(const t_config_option_key opt_key) {
+    ConfigOption* option(const t_config_option_key opt_key, bool create = false) {
+        assert(!create);  // can't create options in StaticConfig
         if (opt_key == "layer_height")              return &this->layer_height;
         if (opt_key == "first_layer_height")        return &this->first_layer_height;
+        if (opt_key == "perimeters")                return &this->perimeters;
+        if (opt_key == "extrusion_axis")            return &this->extrusion_axis;
+        if (opt_key == "print_center")              return &this->print_center;
+        if (opt_key == "notes")                     return &this->notes;
         return NULL;
     };
 };
@@ -111,6 +227,18 @@ static t_optiondef_map _build_optiondef_map () {
     Options["layer_height"].tooltip = "This setting controls the height (and thus the total number) of the slices/layers. Thinner layers give better accuracy but take more time to print.";
 
     Options["first_layer_height"].type = coFloatOrPercent;
+    Options["first_layer_height"].ratio_over = "layer_height";
+    
+    Options["perimeters"].type = coInt;
+    Options["perimeters"].label = "Perimeters (minimum)";
+    Options["perimeters"].tooltip = "This option sets the number of perimeters to generate for each layer. Note that Slic3r may increase this number automatically when it detects sloping surfaces which benefit from a higher number of perimeters if the Extra Perimeters option is enabled.";
+    
+    Options["extrusion_axis"].type = coString;
+    
+    Options["print_center"].type = coPoint;
+    
+    Options["notes"].type = coString;
+    
     return Options;
 }
 
@@ -120,6 +248,10 @@ static FullConfig _build_default_config () {
     defconf.layer_height.value = 0.4;
     defconf.first_layer_height.value = 0.35;
     defconf.first_layer_height.percent = false;
+    defconf.perimeters.value = 3;
+    defconf.extrusion_axis.value = "E";
+    defconf.print_center.point = Pointf(100,100);
+    defconf.notes.value = "";
     
     return defconf;
 }
diff --git a/xs/src/Point.cpp b/xs/src/Point.cpp
index 13e7d23617..e816925fd1 100644
--- a/xs/src/Point.cpp
+++ b/xs/src/Point.cpp
@@ -171,6 +171,23 @@ Point::from_SV_check(SV* point_sv)
         this->from_SV(point_sv);
     }
 }
+
+SV*
+Pointf::to_SV_pureperl() const {
+    AV* av = newAV();
+    av_fill(av, 1);
+    av_store(av, 0, newSVnv(this->x));
+    av_store(av, 1, newSVnv(this->y));
+    return newRV_noinc((SV*)av);
+}
+
+void
+Pointf::from_SV(SV* point_sv)
+{
+    AV* point_av = (AV*)SvRV(point_sv);
+    this->x = SvNV(*av_fetch(point_av, 0, 0));
+    this->y = SvNV(*av_fetch(point_av, 1, 0));
+}
 #endif
 
 }
diff --git a/xs/src/Point.hpp b/xs/src/Point.hpp
index d89a12cb8a..202ec557d7 100644
--- a/xs/src/Point.hpp
+++ b/xs/src/Point.hpp
@@ -42,6 +42,19 @@ class Point
     #endif
 };
 
+class Pointf
+{
+    public:
+    float x;
+    float y;
+    explicit Pointf(float _x = 0, float _y = 0): x(_x), y(_y) {};
+    
+    #ifdef SLIC3RXS
+    void from_SV(SV* point_sv);
+    SV* to_SV_pureperl() const;
+    #endif
+};
+
 }
 
 #endif
diff --git a/xs/t/15_config.t b/xs/t/15_config.t
new file mode 100644
index 0000000000..9ff4a6dac0
--- /dev/null
+++ b/xs/t/15_config.t
@@ -0,0 +1,45 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Slic3r::XS;
+use Test::More tests => 16;
+
+{
+    my $config = Slic3r::Config->new;
+    
+    $config->set('layer_height', 0.3);
+    ok abs($config->get('layer_height') - 0.3) < 1e-4, 'set/get float';
+    is $config->serialize('layer_height'), '0.3', 'serialize float';
+    
+    $config->set('perimeters', 2);
+    is $config->get('perimeters'), 2, 'set/get int';
+    is $config->serialize('perimeters'), '2', 'serialize int';
+    
+    $config->set('extrusion_axis', 'A');
+    is $config->get('extrusion_axis'), 'A', 'set/get string';
+    is $config->serialize('extrusion_axis'), 'A', 'serialize string';
+    
+    $config->set('notes', "foo\nbar");
+    is $config->get('notes'), "foo\nbar", 'set/get string with newline';
+    is $config->serialize('notes'), 'foo\nbar', 'serialize string with newline';
+    $config->set_deserialize('notes', 'bar\nbaz');
+    is $config->get('notes'), "bar\nbaz", 'deserialize string with newline';
+    
+    $config->set('first_layer_height', 0.3);
+    ok abs($config->get('first_layer_height') - 0.3) < 1e-4, 'set/get absolute floatOrPercent';
+    is $config->serialize('first_layer_height'), '0.3', 'serialize absolute floatOrPercent';
+    
+    $config->set('first_layer_height', '50%');
+    ok abs($config->get_abs_value('first_layer_height') - 0.15) < 1e-4, 'set/get relative floatOrPercent';
+    is $config->serialize('first_layer_height'), '50%', 'serialize relative floatOrPercent';
+    
+    $config->set('print_center', [50,80]);
+    is_deeply $config->get('print_center'), [50,80], 'set/get point';
+    is $config->serialize('print_center'), '50,80', 'serialize point';
+    $config->set_deserialize('print_center', '20,10');
+    is_deeply $config->get('print_center'), [20,10], 'deserialize point';
+}
+
+__END__
diff --git a/xs/xsp/Config.xsp b/xs/xsp/Config.xsp
index 1bd9d9db68..b0e4595309 100644
--- a/xs/xsp/Config.xsp
+++ b/xs/xsp/Config.xsp
@@ -9,6 +9,10 @@
     DynamicConfig();
     ~DynamicConfig();
     SV* get(t_config_option_key opt_key);
+    void set(t_config_option_key opt_key, SV* value);
+    void set_deserialize(t_config_option_key opt_key, std::string str);
+    std::string serialize(t_config_option_key opt_key);
+    float get_abs_value(t_config_option_key opt_key);
 %{
 
 %}