diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 25fb1c1ff..e4402d646 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -1201,7 +1201,7 @@ sub object_cut_dialog {
 	
 	if (my @new_objects = $dlg->NewModelObjects) {
 	    $self->remove($obj_idx);
-	    $self->load_model_objects(@new_objects);
+	    $self->load_model_objects(grep defined($_), @new_objects);
 	    $self->arrange;
 	}
 }
diff --git a/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm b/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm
index a2d740f91..4d9819a50 100644
--- a/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm
@@ -125,7 +125,8 @@ sub new {
 sub perform_cut {
     my ($self) = @_;
     
-    my ($upper_object, $lower_object) = $self->{model_object}->cut($self->{cut_options}{z});
+    my ($new_model, $upper_object, $lower_object) = $self->{model_object}->cut($self->{cut_options}{z});
+    $self->{new_model} = $new_model;
     $self->{new_model_objects} = [];
     if ($self->{cut_options}{keep_upper} && defined $upper_object) {
         push @{$self->{new_model_objects}}, $upper_object;
diff --git a/lib/Slic3r/Model.pm b/lib/Slic3r/Model.pm
index 3a0d60547..24f17016c 100644
--- a/lib/Slic3r/Model.pm
+++ b/lib/Slic3r/Model.pm
@@ -553,14 +553,12 @@ sub print_info {
 sub cut {
     my ($self, $z) = @_;
     
-    # clone this one
-    my $upper = $self->model->add_object($self);
-    my $lower = $self->model->add_object($self);
-    
-    foreach my $instance (@{$self->instances}) {
-        $upper->add_instance(offset => Slic3r::Pointf->new(@{$instance->offset}));
-        $lower->add_instance(offset => Slic3r::Pointf->new(@{$instance->offset}));
-    }
+    # clone this one to duplicate instances, materials etc.
+    my $model = Slic3r::Model->new;
+    my $upper = $model->add_object($self);
+    my $lower = $model->add_object($self);
+    $upper->clear_volumes;
+    $lower->clear_volumes;
     
     foreach my $volume (@{$self->volumes}) {
         if ($volume->modifier) {
@@ -584,7 +582,7 @@ sub cut {
                 );
             }
             if ($lower_mesh->facets_count > 0) {
-            $lower->add_volume(
+                $lower->add_volume(
                     material_id => $volume->material_id,
                     mesh        => $lower_mesh,
                     modifier    => $volume->modifier,
@@ -595,7 +593,7 @@ sub cut {
     
     $upper = undef if !@{$upper->volumes};
     $lower = undef if !@{$lower->volumes};
-    return ($upper, $lower);
+    return ($model, $upper, $lower);
 }
 
 package Slic3r::Model::Volume;