diff --git a/README.markdown b/README.markdown
index 48d93ae7a..a513fe3e8 100644
--- a/README.markdown
+++ b/README.markdown
@@ -20,9 +20,6 @@ algorithms in the future.
 I also aim at implementing better support for hollow objects, as Skeinforge
 isn't smart enough to generate internal support structures for horizontal
 facets.
-Of course, Perl's not that fast as C and usage of modules like Moose make
-everything quite memory-hungry, but I'm happy with it. I want to build a "rapid
-prototyping" architecture for a slicer.
 
 Also, http://xkcd.com/224/
 
diff --git a/lib/Slic3r/ExtrusionPath.pm b/lib/Slic3r/ExtrusionPath.pm
index e462956f3..43802db9e 100644
--- a/lib/Slic3r/ExtrusionPath.pm
+++ b/lib/Slic3r/ExtrusionPath.pm
@@ -1,5 +1,5 @@
 package Slic3r::ExtrusionPath;
-use Moose;
+use Moo;
 
 extends 'Slic3r::Polyline';
 
diff --git a/lib/Slic3r/Fill.pm b/lib/Slic3r/Fill.pm
index 7e01f0304..e816e72bf 100644
--- a/lib/Slic3r/Fill.pm
+++ b/lib/Slic3r/Fill.pm
@@ -1,5 +1,5 @@
 package Slic3r::Fill;
-use Moose;
+use Moo;
 
 use Slic3r::Fill::Rectilinear;
 
diff --git a/lib/Slic3r/Fill/Rectilinear.pm b/lib/Slic3r/Fill/Rectilinear.pm
index 1acccbfb7..2efc71fd6 100644
--- a/lib/Slic3r/Fill/Rectilinear.pm
+++ b/lib/Slic3r/Fill/Rectilinear.pm
@@ -1,5 +1,5 @@
 package Slic3r::Fill::Rectilinear;
-use Moose;
+use Moo;
 
 use constant epsilon => 1E-10;
 use constant PI => 4 * atan2(1, 1);
@@ -45,10 +45,10 @@ sub make_fill {
             
             # find out the coordinates
             my @coordinates = map @$_, @$line;
-            Slic3r::debugf "Segment %d,%d - %d,%d\n", @coordinates;
             
             # get the extents of the segment along the primary axis
-            my @line_c = sort ($coordinates[X1], $coordinates[X2]);
+            my @line_c = sort { $a <=> $b } @coordinates[X1, X2];
+            Slic3r::debugf "Segment %d,%d - %d,%d (extents: %f, %f)\n", @coordinates, @line_c;
             
             for (my $c = $line_c[0]; $c <= $line_c[1]; $c += $distance_between_lines) {
                 my $i = sprintf('%.0f', $c / $distance_between_lines) - 1;
diff --git a/lib/Slic3r/Layer.pm b/lib/Slic3r/Layer.pm
index 6a7fdcb6c..26d7e206a 100644
--- a/lib/Slic3r/Layer.pm
+++ b/lib/Slic3r/Layer.pm
@@ -1,12 +1,12 @@
 package Slic3r::Layer;
-use Moose;
+use Moo;
 
 use XXX;
 
 # a sequential number of layer, starting at 0
 has 'id' => (
     is          => 'ro',
-    isa         => 'Int',
+    #isa         => 'Int',
     required    => 1,
 );
 
@@ -16,18 +16,15 @@ has 'id' => (
 has 'pointmap' => (
     traits      => ['Hash'],
     is          => 'rw',
-    isa         => 'HashRef[Slic3r::Point]',
+    #isa         => 'HashRef[Slic3r::Point]',
     default     => sub { {} },
-    handles     => {
-        points  => 'values',
-    },
 );
 
 # collection of segments generated by slicing the original geometry
 # each segment is part of a closed polyline
 has 'lines' => (
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Line]',
+    #isa     => 'ArrayRef[Slic3r::Line]',
     default => sub { [] },
 );
 
@@ -35,21 +32,21 @@ has 'lines' => (
 has 'surfaces' => (
     traits  => ['Array'],
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Surface]',
+    #isa     => 'ArrayRef[Slic3r::Surface]',
     default => sub { [] },
 );
 
 # ordered collection of extrusion paths to build all perimeters
 has 'perimeters' => (
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::ExtrusionPath]',
+    #isa     => 'ArrayRef[Slic3r::ExtrusionPath]',
     default => sub { [] },
 );
 
 # ordered collection of extrusion paths to build skirt loops
 has 'skirts' => (
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::ExtrusionPath]',
+    #isa     => 'ArrayRef[Slic3r::ExtrusionPath]',
     default => sub { [] },
 );
 
@@ -58,14 +55,14 @@ has 'skirts' => (
 has 'fill_surfaces' => (
     traits  => ['Array'],
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Surface]',
+    #isa     => 'ArrayRef[Slic3r::Surface]',
     default => sub { [] },
 );
 
 # ordered collection of extrusion paths to fill surfaces
 has 'fills' => (
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::ExtrusionPath]',
+    #isa     => 'ArrayRef[Slic3r::ExtrusionPath]',
     default => sub { [] },
 );
 
@@ -74,6 +71,11 @@ sub z {
     return $self->id * $Slic3r::layer_height / $Slic3r::resolution;
 }
 
+sub points {
+    my $self = shift;
+    return values %{ $self->pointmap };
+}
+
 sub add_surface {
     my $self = shift;
     my (@vertices) = @_;
diff --git a/lib/Slic3r/Line.pm b/lib/Slic3r/Line.pm
index 2cdead36b..0919a06a9 100644
--- a/lib/Slic3r/Line.pm
+++ b/lib/Slic3r/Line.pm
@@ -1,32 +1,28 @@
 package Slic3r::Line;
-use Moose;
-use Moose::Util::TypeConstraints;
+use Moo;
 use Scalar::Util qw(weaken);
 
-subtype 'Slic3r::Line::Length', as 'Int';
-coerce 'Slic3r::Line::Length', from 'Num', via { sprintf '%.0f', $_ };
-
 has 'a' => (
     is          => 'ro',
-    isa         => 'Slic3r::Point',
+    #isa         => 'Slic3r::Point',
     required    => 1,
 );
 
 has 'b' => (
     is          => 'ro',
-    isa         => 'Slic3r::Point',
+    #isa         => 'Slic3r::Point',
     required    => 1,
 );
 
 has 'polyline' => (
     is          => 'rw',
-    isa         => 'Slic3r::Polyline',
+    #isa         => 'Slic3r::Polyline',
     weak_ref    => 1,
 );
 
 has 'solid_side' => (
     is      => 'rw',
-    isa     => enum([qw(left right)]),  # going from a to b
+    #isa     => enum([qw(left right)]),  # going from a to b
 );
 
 sub BUILD {
diff --git a/lib/Slic3r/Perimeter.pm b/lib/Slic3r/Perimeter.pm
index 1b85d7812..fe5a59daa 100644
--- a/lib/Slic3r/Perimeter.pm
+++ b/lib/Slic3r/Perimeter.pm
@@ -1,5 +1,5 @@
 package Slic3r::Perimeter;
-use Moose;
+use Moo;
 
 use Math::Geometry::Planar;
 *Math::Geometry::Planar::OffsetPolygon = *Math::Geometry::Planar::Offset::OffsetPolygon;
diff --git a/lib/Slic3r/Point.pm b/lib/Slic3r/Point.pm
index 2f93a7471..febbd2655 100644
--- a/lib/Slic3r/Point.pm
+++ b/lib/Slic3r/Point.pm
@@ -1,28 +1,24 @@
 package Slic3r::Point;
-use Moose;
-use Moose::Util::TypeConstraints;
-
-subtype 'Slic3r::Point::Coordinate', as 'Int';
-coerce 'Slic3r::Point::Coordinate', from 'Num', via { sprintf '%.0f', $_ };
+use Moo;
 
 has 'x' => (
     is          => 'ro',
-    isa         => 'Slic3r::Point::Coordinate',
+    #isa         => 'Slic3r::Point::Coordinate',
     required    => 1,
-    coerce      => 1,
+    coerce      => sub { sprintf '%.0f', $_[0] },
 );
 
 has 'y' => (
     is          => 'ro',
-    isa         => 'Slic3r::Point::Coordinate',
+    #isa         => 'Slic3r::Point::Coordinate',
     required    => 1,
-    coerce      => 1,
+    coerce      => sub { sprintf '%.0f', $_[0] },
 );
 
 # this array contains weak references, so it can contain undef's as well
 has 'lines' => (
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Line]',
+    #isa     => 'ArrayRef[Slic3r::Line]',
     default => sub { [] },
 );
 
diff --git a/lib/Slic3r/Polyline.pm b/lib/Slic3r/Polyline.pm
index 592e5d314..68b30082d 100644
--- a/lib/Slic3r/Polyline.pm
+++ b/lib/Slic3r/Polyline.pm
@@ -1,23 +1,23 @@
 package Slic3r::Polyline;
-use Moose;
+use Moo;
 
 has 'lines' => (
     traits  => ['Array'],
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Line]',
+    #isa     => 'ArrayRef[Slic3r::Line]',
     default => sub { [] },
-    handles => {
-        add_line => 'push',
-    },
 );
 
-after 'add_line' => sub {
+sub add_line {
     my $self = shift;
+    my ($line) = @_;
+    
+    push @{ $self->lines }, $line;
     
     # add a weak reference to this polyline in line objects
     # (avoid circular refs)
     $self->lines->[-1]->polyline($self);
-};
+}
 
 sub BUILD {
     my $self = shift;
diff --git a/lib/Slic3r/Polyline/Closed.pm b/lib/Slic3r/Polyline/Closed.pm
index 222386bd8..9c950626b 100644
--- a/lib/Slic3r/Polyline/Closed.pm
+++ b/lib/Slic3r/Polyline/Closed.pm
@@ -1,30 +1,30 @@
 package Slic3r::Polyline::Closed;
-use Moose;
+use Moo;
 
 extends 'Slic3r::Polyline';
 
 has 'contour_of' => (
     is          => 'rw',
-    isa         => 'Slic3r::Surface',
+    #isa         => 'Slic3r::Surface',
     weak_ref    => 1,
 );
 
 has 'hole_of' => (
     is          => 'rw',
-    isa         => 'Slic3r::Surface',
+    #isa         => 'Slic3r::Surface',
     weak_ref    => 1,
 );
 
-override 'new_from_points' => sub {
+sub new_from_points {
     my $class = shift;
-    my $polyline = super();
+    my $polyline = $class->SUPER::new_from_points(@_);
     
     # polylines must be always closed, otherwise it means that our object is not manifold!
     die "Polylines must be closed! Object not manifold?\n"
         if ($polyline->lines->[0]->a != $polyline->lines->[-1]->b);
     
     return $polyline;
-};
+}
 
 sub encloses_point {
     my $self = shift;
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index a53c4356c..ad71c6c26 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -1,5 +1,5 @@
 package Slic3r::Print;
-use Moose;
+use Moo;
 
 use constant PI => 4 * atan2(1, 1);
 use constant X => 0;
@@ -7,37 +7,39 @@ use constant Y => 1;
 
 has 'x_length' => (
     is          => 'ro',
-    isa         => 'Slic3r::Line::Length',
+    #isa         => 'Slic3r::Line::Length',
     required    => 1,
-    coerce      => 1,
+    coerce      => sub { sprintf '%.0f', $_[0] },
 );
 
 has 'y_length' => (
     is          => 'ro',
-    isa         => 'Slic3r::Line::Length',
+    #isa         => 'Slic3r::Line::Length',
     required    => 1,
-    coerce      => 1,
+    coerce      => sub { sprintf '%.0f', $_[0] },
 );
 
 has 'layers' => (
     traits  => ['Array'],
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Layer]',
+    #isa     => 'ArrayRef[Slic3r::Layer]',
     default => sub { [] },
-    handles => {
-        layer_count => 'count',
-        add_layer   => 'push',
-    },
 );
 
+sub layer_count {
+    my $self = shift;
+    return scalar @{ $self->layers };
+}
+
 sub layer {
     my $self = shift;
     my ($layer_id) = @_;
     
     # extend our print by creating all necessary layers
+    
     if ($self->layer_count < $layer_id + 1) {
         for (my $i = $self->layer_count; $i <= $layer_id; $i++) {
-            $self->add_layer(Slic3r::Layer->new(id => $i));
+            push @{ $self->layers }, Slic3r::Layer->new(id => $i);
         }
     }
     
diff --git a/lib/Slic3r/STL.pm b/lib/Slic3r/STL.pm
index 68070557f..328e90dcb 100644
--- a/lib/Slic3r/STL.pm
+++ b/lib/Slic3r/STL.pm
@@ -1,5 +1,5 @@
 package Slic3r::STL;
-use Moose;
+use Moo;
 
 use CAD::Format::STL;
 use XXX;
diff --git a/lib/Slic3r/Surface.pm b/lib/Slic3r/Surface.pm
index 60b81eb1d..ff438c820 100644
--- a/lib/Slic3r/Surface.pm
+++ b/lib/Slic3r/Surface.pm
@@ -1,39 +1,38 @@
 package Slic3r::Surface;
-use Moose;
+use Moo;
 
 use Math::Geometry::Planar;
-use Moose::Util::TypeConstraints;
 
 has 'contour' => (
     is          => 'ro',
-    isa         => 'Slic3r::Polyline::Closed',
+    #isa         => 'Slic3r::Polyline::Closed',
     required    => 1,
 );
 
 has 'holes' => (
     traits  => ['Array'],
     is      => 'rw',
-    isa     => 'ArrayRef[Slic3r::Polyline::Closed]',
+    #isa     => 'ArrayRef[Slic3r::Polyline::Closed]',
     default => sub { [] },
-    handles => {
-        'add_hole' => 'push',
-    },
 );
 
 # TODO: to allow for multiple solid skins to be filled near external
 # surfaces, a new type should be defined: internal-solid
 has 'surface_type' => (
     is      => 'rw',
-    isa     => enum([qw(internal bottom top)]),
+    #isa     => enum([qw(internal bottom top)]),
 );
 
-after 'add_hole' => sub {
+sub add_hole {
     my $self = shift;
+    my ($hole) = @_;
+    
+    push @{ $self->holes }, $hole;
     
     # add a weak reference to this surface in polyline objects
     # (avoid circular refs)
     $self->holes->[-1]->hole_of($self);
-};
+}
 
 sub BUILD {
     my $self = shift;