diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index e9cdf1527a..8ab749e241 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -1127,8 +1127,7 @@ sub changescale {
     my $model_object = $self->{model}->objects->[$obj_idx];
     my $model_instance = $model_object->instances->[0];
     
-    my $object_size = $model_object->bounding_box->size;
-    my $bed_size = Slic3r::Polygon->new_scale(@{$self->{config}->bed_shape})->bounding_box->size;
+    my $object_size = $model_object->instance_bounding_box(0)->size;
     
     if (defined $axis) {
         my $axis_name = $axis == X ? 'X' : $axis == Y ? 'Y' : 'Z';
@@ -1136,7 +1135,7 @@ sub changescale {
         if ($tosize) {
             my $cursize = $object_size->[$axis];
             my $newsize = $self->_get_number_from_user(
-                sprintf(L('Enter the new size for the selected object (print bed: %smm):'), unscale($bed_size->[$axis])), 
+                L('Enter the new size for the selected object:'), 
                 L("Scale along ").$axis_name, L('Invalid scaling value entered'), $cursize, 1);
             return if $newsize eq '';
             $scale = $newsize / $cursize * 100;
@@ -1292,7 +1291,9 @@ sub async_apply_config {
 
         # We also need to reload 3D scene because of the wipe tower preview box
         if ($self->{config}->wipe_tower) {
-	       Slic3r::GUI::_3DScene::reload_scene($self->{canvas3D}, 1) if $self->{canvas3D}
+            my $selections = $self->collect_selections;
+            Slic3r::GUI::_3DScene::set_objects_selections($self->{canvas3D}, \@$selections);
+	        Slic3r::GUI::_3DScene::reload_scene($self->{canvas3D}, 1) if $self->{canvas3D}
         }
     }
 }
@@ -1508,6 +1509,8 @@ sub on_process_completed {
     $self->{preview3D}->reload_print if $self->{preview3D};
 
     # in case this was MM print, wipe tower bounding box on 3D tab might need redrawing with exact depth:
+    my $selections = $self->collect_selections;
+    Slic3r::GUI::_3DScene::set_objects_selections($self->{canvas3D}, \@$selections);
     Slic3r::GUI::_3DScene::reload_scene($self->{canvas3D}, 1);
     
     # if we have an export filename, start a new thread for exporting G-code
diff --git a/xs/src/slic3r/GUI/3DScene.cpp b/xs/src/slic3r/GUI/3DScene.cpp
index 0709271b8c..7053470943 100644
--- a/xs/src/slic3r/GUI/3DScene.cpp
+++ b/xs/src/slic3r/GUI/3DScene.cpp
@@ -204,6 +204,7 @@ GLVolume::GLVolume(float r, float g, float b, float a)
     , m_scale_factor(1.0f)
     , m_transformed_bounding_box_dirty(true)
     , m_transformed_convex_hull_bounding_box_dirty(true)
+    , m_convex_hull(nullptr)
     , composite_id(-1)
     , select_group_id(-1)
     , drag_group_id(-1)
@@ -293,7 +294,7 @@ void GLVolume::set_scale_factor(float scale_factor)
 
 void GLVolume::set_convex_hull(const TriangleMesh& convex_hull)
 {
-    m_convex_hull = convex_hull;
+    m_convex_hull = &convex_hull;
 }
 
 std::vector<float> GLVolume::world_matrix() const
@@ -322,8 +323,8 @@ BoundingBoxf3 GLVolume::transformed_convex_hull_bounding_box() const
 {
     if (m_transformed_convex_hull_bounding_box_dirty)
     {
-        if (m_convex_hull.stl.stats.number_of_facets > 0)
-            m_transformed_convex_hull_bounding_box = m_convex_hull.transformed_bounding_box(world_matrix());
+        if ((m_convex_hull != nullptr) && (m_convex_hull->stl.stats.number_of_facets > 0))
+            m_transformed_convex_hull_bounding_box = m_convex_hull->transformed_bounding_box(world_matrix());
         else
             m_transformed_convex_hull_bounding_box = bounding_box.transformed(world_matrix());
 
@@ -747,7 +748,6 @@ int GLVolumeCollection::load_wipe_tower_preview(
     v.drag_group_id = obj_idx * 1000;
     v.is_wipe_tower = true;
     v.shader_outside_printer_detection_enabled = ! size_unknown;
-    v.set_convex_hull(mesh.convex_hull_3d());
     return int(this->volumes.size() - 1);
 }
 
@@ -833,7 +833,7 @@ bool GLVolumeCollection::check_outside_state(const DynamicPrintConfig* config, M
 
     for (GLVolume* volume : this->volumes)
     {
-        if ((volume != nullptr) && !volume->is_modifier)
+        if ((volume != nullptr) && !volume->is_modifier && (!volume->is_wipe_tower || (volume->is_wipe_tower && volume->shader_outside_printer_detection_enabled)))
         {
             const BoundingBoxf3& bb = volume->transformed_convex_hull_bounding_box();
             bool contained = print_volume.contains(bb);
diff --git a/xs/src/slic3r/GUI/3DScene.hpp b/xs/src/slic3r/GUI/3DScene.hpp
index 1265bc20de..5cd144c680 100644
--- a/xs/src/slic3r/GUI/3DScene.hpp
+++ b/xs/src/slic3r/GUI/3DScene.hpp
@@ -264,8 +264,8 @@ private:
     mutable BoundingBoxf3 m_transformed_bounding_box;
     // Whether or not is needed to recalculate the transformed bounding box.
     mutable bool          m_transformed_bounding_box_dirty;
-    // Convex hull of the original mesh, if any.
-    TriangleMesh          m_convex_hull;
+    // Pointer to convex hull of the original mesh, if any.
+    const TriangleMesh*   m_convex_hull;
     // Bounding box of this volume, in unscaled coordinates.
     mutable BoundingBoxf3 m_transformed_convex_hull_bounding_box;
     // Whether or not is needed to recalculate the transformed convex hull bounding box.
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index 947af67543..01a8b80f9f 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -3061,6 +3061,10 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             }
             
             _on_move(volume_idxs);
+
+            // force re-selection of the wipe tower, if needed
+            if ((volume_idxs.size() == 1) && m_volumes.volumes[volume_idxs[0]]->is_wipe_tower)
+                select_volume(volume_idxs[0]);
         }
         else if (!m_mouse.dragging && (m_hover_volume_id == -1) && !gizmos_overlay_contains_mouse && !m_gizmos.is_dragging() && !is_layers_editing_enabled())
         {