diff --git a/xs/MANIFEST b/xs/MANIFEST
index c29ced6ef..b8232a848 100644
--- a/xs/MANIFEST
+++ b/xs/MANIFEST
@@ -18,6 +18,7 @@ src/admesh/stlinit.c
 src/admesh/stlinit.o
 src/admesh/util.c
 src/admesh/util.o
+src/ExPolygon.hpp
 src/myinit.h
 src/Point.cpp
 src/Point.hpp
@@ -30,6 +31,8 @@ src/ZTable.hpp
 t/01_trianglemesh.t
 t/02_object.t
 t/03_point.t
+t/04_expolygon.t
+xsp/ExPolygon.xsp
 xsp/my.map
 xsp/mytype.map
 xsp/Object.xsp
diff --git a/xs/lib/Slic3r/XS.pm b/xs/lib/Slic3r/XS.pm
index 1b245329a..8df63af91 100644
--- a/xs/lib/Slic3r/XS.pm
+++ b/xs/lib/Slic3r/XS.pm
@@ -11,4 +11,8 @@ package Slic3r::Point::XS;
 use overload
     '@{}' => sub { $_[0]->_toPerl };
 
+package Slic3r::ExPolygon::XS;
+use overload
+    '@{}' => sub { $_[0]->_toPerl };
+
 1;
diff --git a/xs/src/ExPolygon.hpp b/xs/src/ExPolygon.hpp
new file mode 100644
index 000000000..093b69167
--- /dev/null
+++ b/xs/src/ExPolygon.hpp
@@ -0,0 +1,52 @@
+#ifndef slic3r_ExPolygon_hpp_
+#define slic3r_ExPolygon_hpp_
+
+extern "C" {
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+#include "ppport.h"
+}
+
+#include "Point.hpp"
+
+typedef std::vector<Point> Polygon;
+typedef std::vector<Polygon> Polygons;
+
+class ExPolygon
+{
+    public:
+    Polygon contour;
+    Polygons holes;
+    SV* _toPerl();
+};
+
+Polygon*
+perl2polygon(SV* poly_sv)
+{
+    AV* poly_av = (AV*)SvRV(poly_sv);
+    const unsigned int num_points = av_len(poly_av)+1;
+    Polygon* retval = new Polygon(num_points);
+    
+    for (unsigned int i = 0; i < num_points; i++) {
+        SV** point_sv = av_fetch(poly_av, i, 0);
+        AV*  point_av = (AV*)SvRV(*point_sv);
+        Point& p = (*retval)[i];
+        p.x = (unsigned long)SvIV(*av_fetch(point_av, 0, 0));
+        p.y = (unsigned long)SvIV(*av_fetch(point_av, 1, 0));
+    }
+    return retval;
+}
+
+SV*
+polygon2perl(Polygon& poly) {
+    const unsigned int num_points = poly.size();
+    AV* av = newAV();
+    av_extend(av, num_points-1);
+    for (unsigned int i = 0; i < num_points; i++) {
+        av_store(av, i, poly[i]._toPerl());
+    }
+    return (SV*)newRV_noinc((SV*)av);
+}
+
+#endif
diff --git a/xs/src/Point.cpp b/xs/src/Point.cpp
index a4c905eae..3758cabc7 100644
--- a/xs/src/Point.cpp
+++ b/xs/src/Point.cpp
@@ -1,7 +1,6 @@
 #include "myinit.h"
 #include "Point.hpp"
 
-Point::Point(unsigned long x, unsigned long y) {}
 Point::~Point() {}
 
 
diff --git a/xs/src/Point.hpp b/xs/src/Point.hpp
index 3b7a5e5dd..eedd73fde 100644
--- a/xs/src/Point.hpp
+++ b/xs/src/Point.hpp
@@ -13,7 +13,7 @@ class Point
     public:
     unsigned long x;
     unsigned long y;
-    Point(unsigned long _x, unsigned long _y): x(_x), y(_y) {};
+    Point(unsigned long _x = 0, unsigned long _y = 0): x(_x), y(_y) {};
     ~Point();
     SV* _toPerl();
 };
diff --git a/xs/t/04_expolygon.t b/xs/t/04_expolygon.t
new file mode 100644
index 000000000..0fe27640c
--- /dev/null
+++ b/xs/t/04_expolygon.t
@@ -0,0 +1,25 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Slic3r::XS;
+use Test::More tests => 1;
+
+my $square = [  # ccw
+    [100, 100],
+    [200, 100],
+    [200, 200],
+    [100, 200],
+];
+my $hole_in_square = [  # cw
+    [140, 140],
+    [140, 160],
+    [160, 160],
+    [160, 140],
+];
+
+my $expolygon = Slic3r::ExPolygon::XS->new($square, $hole_in_square);
+is_deeply [ @$expolygon ], [$square, $hole_in_square], 'expolygon roundtrip';
+
+__END__
diff --git a/xs/xsp/ExPolygon.xsp b/xs/xsp/ExPolygon.xsp
new file mode 100644
index 000000000..0c8bdbf9e
--- /dev/null
+++ b/xs/xsp/ExPolygon.xsp
@@ -0,0 +1,51 @@
+%module{Slic3r::XS};
+
+%{
+#include <myinit.h>
+#include "ExPolygon.hpp"
+%}
+
+%name{Slic3r::ExPolygon::XS} class ExPolygon {
+%{
+
+ExPolygon*
+ExPolygon::new(...)
+    CODE:
+        RETVAL = new ExPolygon ();
+        // ST(0) is class name, ST(1) is contour and others are holes
+        RETVAL->contour = *perl2polygon(ST(1));
+        for (unsigned int i = 2; i < items; i++) {
+            RETVAL->holes.push_back(*perl2polygon(ST(i)));
+        }
+    OUTPUT:
+        RETVAL
+
+SV*
+ExPolygon::_toPerl()
+    CODE:
+        const unsigned int num_holes = THIS->holes.size();
+        AV* av = newAV();
+        av_fill(av, num_holes);  // -1 +1
+        av_store(av, 0, polygon2perl(THIS->contour));
+        for (unsigned int i = 0; i < num_holes; i++) {
+            av_store(av, i+1, polygon2perl(THIS->holes[i]));
+        }
+        RETVAL = (SV*)newRV_noinc((SV*)av);
+    OUTPUT:
+        RETVAL
+
+%}
+};
+
+%package{Slic3r::ExPolygon::XS};
+
+%{
+PROTOTYPES: DISABLE
+
+std::string
+hello_world()
+  CODE:
+    RETVAL = "Hello world!";
+  OUTPUT:
+    RETVAL
+%}
diff --git a/xs/xsp/Point.xsp b/xs/xsp/Point.xsp
index db810068b..9756a4b31 100644
--- a/xs/xsp/Point.xsp
+++ b/xs/xsp/Point.xsp
@@ -6,7 +6,7 @@
 %}
 
 %name{Slic3r::Point::XS} class Point {
-    Point(unsigned long _x, unsigned long _y);
+    Point(unsigned long _x = 0, unsigned long _y = 0);
     ~Point();
     SV* _toPerl();
 };
diff --git a/xs/xsp/my.map b/xs/xsp/my.map
index 46a311676..329d75e4d 100644
--- a/xs/xsp/my.map
+++ b/xs/xsp/my.map
@@ -1,4 +1,5 @@
 ZTable*         O_OBJECT
 TriangleMesh*         O_OBJECT
 Point*         O_OBJECT
+ExPolygon*      O_OBJECT
 std::vector< unsigned int >*	T_STD_VECTOR_UINT_PTR