diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index a8b15c95ca..8a40279c1f 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -93,37 +93,39 @@ set(SLIC3R_GUI_SOURCES
     GUI/Gizmos/GLGizmoMeasure.cpp
     GUI/Gizmos/GLGizmoMeasure.hpp
 #====================================================================================================================	
-    GUI/LibVGCode/Viewer.hpp
-    GUI/LibVGCode/Viewer.cpp
-    GUI/LibVGCode/Settings.hpp
-    GUI/LibVGCode/Settings.cpp
-    GUI/LibVGCode/SegmentTemplate.hpp
-    GUI/LibVGCode/SegmentTemplate.cpp
-    GUI/LibVGCode/OptionTemplate.hpp
-    GUI/LibVGCode/OptionTemplate.cpp
-    GUI/LibVGCode/Toolpaths.hpp
-    GUI/LibVGCode/Toolpaths.cpp
-    GUI/LibVGCode/PathVertex.hpp
-    GUI/LibVGCode/PathVertex.cpp
-    GUI/LibVGCode/Types.hpp
-    GUI/LibVGCode/Types.cpp
     GUI/LibVGCode/Bitset.hpp
     GUI/LibVGCode/Bitset.cpp
-    GUI/LibVGCode/ViewRange.hpp
-    GUI/LibVGCode/ViewRange.cpp
-    GUI/LibVGCode/ColorRange.hpp
-    GUI/LibVGCode/ColorRange.cpp
-    GUI/LibVGCode/Shaders.hpp
-    GUI/LibVGCode/OpenGLUtils.hpp
-    GUI/LibVGCode/OpenGLUtils.cpp
     GUI/LibVGCode/CogMarker.hpp
     GUI/LibVGCode/CogMarker.cpp
+    GUI/LibVGCode/ColorRange.hpp
+    GUI/LibVGCode/ColorRange.cpp
+    GUI/LibVGCode/Layers.hpp
+    GUI/LibVGCode/Layers.cpp
+    GUI/LibVGCode/OpenGLUtils.hpp
+    GUI/LibVGCode/OpenGLUtils.cpp
+    GUI/LibVGCode/OptionTemplate.hpp
+    GUI/LibVGCode/OptionTemplate.cpp
+    GUI/LibVGCode/PathVertex.hpp
+    GUI/LibVGCode/PathVertex.cpp
+    GUI/LibVGCode/Range.hpp
+    GUI/LibVGCode/Range.cpp
+    GUI/LibVGCode/SegmentTemplate.hpp
+    GUI/LibVGCode/SegmentTemplate.cpp
+    GUI/LibVGCode/Settings.hpp
+    GUI/LibVGCode/Settings.cpp
+    GUI/LibVGCode/Shaders.hpp
     GUI/LibVGCode/ToolMarker.hpp
     GUI/LibVGCode/ToolMarker.cpp
-    GUI/LibVGCode/Shell.hpp
-    GUI/LibVGCode/Shell.cpp
+    GUI/LibVGCode/Toolpaths.hpp
+    GUI/LibVGCode/Toolpaths.cpp
+    GUI/LibVGCode/Types.hpp
+    GUI/LibVGCode/Types.cpp
     GUI/LibVGCode/Utils.hpp
     GUI/LibVGCode/Utils.cpp
+    GUI/LibVGCode/Viewer.hpp
+    GUI/LibVGCode/Viewer.cpp
+    GUI/LibVGCode/ViewRange.hpp
+    GUI/LibVGCode/ViewRange.cpp
 #====================================================================================================================	
     GUI/GLSelectionRectangle.cpp
     GUI/GLSelectionRectangle.hpp
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 75ffb1427e..2207814436 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -907,6 +907,7 @@ void GCodeViewer::load(const GCodeProcessorResult& gcode_result, const Print& pr
 {
 //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 #if ENABLE_NEW_GCODE_VIEWER
+    m_gcode_viewer_2.set_top_layer_only_view(get_app_config()->get_bool("seq_top_layer_only"));
     m_gcode_viewer_2.load(gcode_result, str_tool_colors);
 #endif // ENABLE_NEW_GCODE_VIEWER
 //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@ -1264,7 +1265,7 @@ void GCodeViewer::update_sequential_view_current(unsigned int first, unsigned in
 {
 //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 #if ENABLE_NEW_GCODE_VIEWER
-    m_gcode_viewer_2.set_view_current_range((size_t)first, (size_t)last);
+    m_gcode_viewer_2.set_view_current_range(static_cast<uint32_t>(first), static_cast<uint32_t>(last));
     m_sequential_view.current.first = first;
     m_sequential_view.current.last = last;
     m_sequential_view.last_current = m_sequential_view.current;
@@ -1383,6 +1384,9 @@ void GCodeViewer::set_layers_z_range(const std::array<unsigned int, 2>& layers_z
     bool keep_sequential_current_first = layers_z_range[0] >= m_layers_z_range[0];
     bool keep_sequential_current_last = layers_z_range[1] <= m_layers_z_range[1];
     m_layers_z_range = layers_z_range;
+#if ENABLE_NEW_GCODE_VIEWER
+    m_gcode_viewer_2.set_layers_range(static_cast<uint32_t>(layers_z_range[0]), static_cast<uint32_t>(layers_z_range[1]));
+#endif // ENABLE_NEW_GCODE_VIEWER
     refresh_render_paths(keep_sequential_current_first, keep_sequential_current_last);
     wxGetApp().plater()->update_preview_moves_slider();
 }
diff --git a/src/slic3r/GUI/LibVGCode/Layers.cpp b/src/slic3r/GUI/LibVGCode/Layers.cpp
new file mode 100644
index 0000000000..879de7518b
--- /dev/null
+++ b/src/slic3r/GUI/LibVGCode/Layers.cpp
@@ -0,0 +1,55 @@
+//################################################################################################################################
+// PrusaSlicer development only -> !!!TO BE REMOVED!!!
+#include "libslic3r/Technologies.hpp"
+//################################################################################################################################
+
+///|/ Copyright (c) Prusa Research 2023 Enrico Turri @enricoturri1966, Pavel Mikuš @Godrak
+///|/
+///|/ libvgcode is released under the terms of the AGPLv3 or higher
+///|/
+#include "Layers.hpp"
+
+//################################################################################################################################
+// PrusaSlicer development only -> !!!TO BE REMOVED!!!
+#if ENABLE_NEW_GCODE_VIEWER
+//################################################################################################################################
+
+#include <assert.h>
+
+namespace libvgcode {
+
+void Layers::update(uint32_t layer_id, uint32_t vertex_id)
+{
+    if (m_ranges.empty() || layer_id == m_ranges.size()) {
+        // this code assumes that gcode paths are sent sequentially, one layer after the other
+        assert(layer_id == static_cast<uint32_t>(m_ranges.size()));
+        Range& range = m_ranges.emplace_back(Range());
+        range.set(vertex_id, vertex_id);
+    }
+    else {
+        Range& range = m_ranges.back();
+        range.set(range.get()[0], vertex_id);
+    }
+}
+
+void Layers::reset()
+{
+    m_ranges.clear();
+}
+
+bool Layers::empty() const
+{
+    return m_ranges.empty();
+}
+
+size_t Layers::size() const
+{
+    return m_ranges.size();
+}
+
+} // namespace libvgcode
+
+//################################################################################################################################
+// PrusaSlicer development only -> !!!TO BE REMOVED!!!
+#endif // ENABLE_NEW_GCODE_VIEWER
+//################################################################################################################################
diff --git a/src/slic3r/GUI/LibVGCode/Layers.hpp b/src/slic3r/GUI/LibVGCode/Layers.hpp
new file mode 100644
index 0000000000..f585cc8b7a
--- /dev/null
+++ b/src/slic3r/GUI/LibVGCode/Layers.hpp
@@ -0,0 +1,39 @@
+///|/ Copyright (c) Prusa Research 2023 Enrico Turri @enricoturri1966, Pavel Mikuš @Godrak
+///|/
+///|/ libvgcode is released under the terms of the AGPLv3 or higher
+///|/
+#ifndef VGCODE_LAYERS_HPP
+#define VGCODE_LAYERS_HPP
+
+//################################################################################################################################
+// PrusaSlicer development only -> !!!TO BE REMOVED!!!
+#if ENABLE_NEW_GCODE_VIEWER
+//################################################################################################################################
+
+#include "Range.hpp"
+
+#include <vector>
+
+namespace libvgcode {
+
+class Layers
+{
+public:
+		void update(uint32_t layer_id, uint32_t vertex_id);
+		void reset();
+
+		bool empty() const;
+		size_t size() const;
+
+private:
+		std::vector<Range> m_ranges;
+};
+
+} // namespace libvgcode
+
+//################################################################################################################################
+// PrusaSlicer development only -> !!!TO BE REMOVED!!!
+#endif // ENABLE_NEW_GCODE_VIEWER
+//################################################################################################################################
+
+#endif // VGCODE_LAYERS_HPP
\ No newline at end of file
diff --git a/src/slic3r/GUI/LibVGCode/Shell.cpp b/src/slic3r/GUI/LibVGCode/Range.cpp
similarity index 53%
rename from src/slic3r/GUI/LibVGCode/Shell.cpp
rename to src/slic3r/GUI/LibVGCode/Range.cpp
index 2986f04e6d..31f76c310c 100644
--- a/src/slic3r/GUI/LibVGCode/Shell.cpp
+++ b/src/slic3r/GUI/LibVGCode/Range.cpp
@@ -3,82 +3,58 @@
 #include "libslic3r/Technologies.hpp"
 //################################################################################################################################
 
-///|/ Copyright (c) Prusa Research 2023 Enrico Turri @enricoturri1966
+///|/ Copyright (c) Prusa Research 2023 Enrico Turri @enricoturri1966, Pavel Mikuš @Godrak
 ///|/
 ///|/ libvgcode is released under the terms of the AGPLv3 or higher
 ///|/
-#include "Shell.hpp"
-#include "OpenGLUtils.hpp"
-#include "Utils.hpp"
-
-#include <algorithm>
+#include "Range.hpp"
 
 //################################################################################################################################
 // PrusaSlicer development only -> !!!TO BE REMOVED!!!
 #if ENABLE_NEW_GCODE_VIEWER
 //################################################################################################################################
 
+#include <algorithm>
+
 namespace libvgcode {
 
-Shell::~Shell()
+const std::array<uint32_t, 2>& Range::get() const
 {
-  if (m_ibo_id != 0)
-      glsafe(glDeleteBuffers(1, &m_ibo_id));
-  if (m_vbo_id != 0)
-      glsafe(glDeleteBuffers(1, &m_vbo_id));
-  if (m_vao_id != 0)
-      glsafe(glDeleteVertexArrays(1, &m_vao_id));
+		return m_range;
 }
 
-void Shell::init()
+void Range::set(const std::array<uint32_t, 2>& range)
 {
-    if (m_vao_id != 0)
-        return;
-
+		set(range[0], range[1]);
 }
 
-void Shell::render()
+void Range::set(uint32_t min, uint32_t max)
 {
-    if (m_vao_id == 0 || m_vbo_id == 0 || m_ibo_id == 0)
-        return;
-
-    int curr_vertex_array;
-    glsafe(glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &curr_vertex_array));
-    glcheck();
-
-    glsafe(glBindVertexArray(m_vao_id));
-    glsafe(glDrawElements(GL_TRIANGLES, m_indices_count, GL_UNSIGNED_INT, (const void*)0));
-    glsafe(glBindVertexArray(curr_vertex_array));
+		if (max < min)
+				std::swap(min, max);
+		m_range[0] = min;
+		m_range[1] = max;
 }
 
-const Vec3f& Shell::get_position() const
+void Range::clamp(Range& other)
 {
-    return m_position;
+		other.m_range[0] = std::clamp(other.m_range[0], m_range[0], m_range[1]);
+		other.m_range[1] = std::clamp(other.m_range[1], m_range[0], m_range[1]);
 }
 
-void Shell::set_position(const Vec3f& position)
+void Range::reset()
 {
-    m_position = position;
+		m_range = { 0, 0 };
 }
 
-const Color& Shell::get_color() const
+bool Range::operator == (const Range& other) const
 {
-    return m_color;
+		return m_range == other.m_range;
 }
 
-void Shell::set_color(const Color& color)
+bool Range::operator != (const Range& other) const
 {
-    m_color = color;
-}
-
-float Shell::get_alpha() const
-{
-    return m_alpha;
-}
-
-void Shell::set_alpha(float alpha)
-{
-    m_alpha = std::clamp(alpha, 0.25f, 0.75f);
+		return m_range != other.m_range;
 }
 
 } // namespace libvgcode
diff --git a/src/slic3r/GUI/LibVGCode/Shell.hpp b/src/slic3r/GUI/LibVGCode/Range.hpp
similarity index 52%
rename from src/slic3r/GUI/LibVGCode/Shell.hpp
rename to src/slic3r/GUI/LibVGCode/Range.hpp
index f7747ae453..7829b28335 100644
--- a/src/slic3r/GUI/LibVGCode/Shell.hpp
+++ b/src/slic3r/GUI/LibVGCode/Range.hpp
@@ -1,52 +1,36 @@
-///|/ Copyright (c) Prusa Research 2023 Enrico Turri @enricoturri1966
+///|/ Copyright (c) Prusa Research 2023 Enrico Turri @enricoturri1966, Pavel Mikuš @Godrak
 ///|/
 ///|/ libvgcode is released under the terms of the AGPLv3 or higher
 ///|/
-#ifndef VGCODE_SHELL_HPP
-#define VGCODE_SHELL_HPP
+#ifndef VGCODE_RANGE_HPP
+#define VGCODE_RANGE_HPP
 
 //################################################################################################################################
 // PrusaSlicer development only -> !!!TO BE REMOVED!!!
 #if ENABLE_NEW_GCODE_VIEWER
 //################################################################################################################################
 
-#include "Types.hpp"
-
+#include <array>
 #include <cstdint>
 
 namespace libvgcode {
 
-class Shell
+class Range
 {
 public:
-    Shell() = default;
-    ~Shell();
-    Shell(const Shell& other) = delete;
-    Shell(Shell&& other) = delete;
-    Shell& operator = (const Shell& other) = delete;
-    Shell& operator = (Shell&& other) = delete;
+		const std::array<uint32_t, 2>& get() const;
+		void set(const std::array<uint32_t, 2>& range);
+		void set(uint32_t min, uint32_t max);
+		// clamp the given range to stay inside this range
+		void clamp(Range& other);
+		void reset();
 
-    void init();
-    void render();
-
-    const Vec3f& get_position() const;
-    void set_position(const Vec3f& position);
-
-    const Color& get_color() const;
-    void set_color(const Color& color);
-
-    float get_alpha() const;
-    void set_alpha(float alpha);
+		bool operator == (const Range& other) const;
+		bool operator != (const Range& other) const;
 
 private:
-    Vec3f m_position{ 0.0f, 0.0f, 0.0f };
-    Color m_color{ 1.0f, 1.0f, 1.0f };
-    float m_alpha{ 0.5f };
-
-    uint32_t m_indices_count{ 0 };
-    unsigned int m_vao_id{ 0 };
-    unsigned int m_vbo_id{ 0 };
-    unsigned int m_ibo_id{ 0 };
+		// [0] = min, [1] = max
+		std::array<uint32_t, 2> m_range{ 0, 0 };
 };
 
 } // namespace libvgcode
@@ -56,4 +40,4 @@ private:
 #endif // ENABLE_NEW_GCODE_VIEWER
 //################################################################################################################################
 
-#endif // VGCODE_SHELL_HPP
\ No newline at end of file
+#endif // VGCODE_RANGE_HPP
\ No newline at end of file
diff --git a/src/slic3r/GUI/LibVGCode/Settings.hpp b/src/slic3r/GUI/LibVGCode/Settings.hpp
index 30158ec0eb..e0f0bfc350 100644
--- a/src/slic3r/GUI/LibVGCode/Settings.hpp
+++ b/src/slic3r/GUI/LibVGCode/Settings.hpp
@@ -18,10 +18,12 @@ namespace libvgcode {
 
 struct Settings
 {
-    bool update_enabled_entities{ true };
+		bool update_view_global_range{ true };
+		bool update_enabled_entities{ true };
 		bool update_colors{ true };
 		EViewType view_type{ EViewType::FeatureType };
 		ETimeMode time_mode{ ETimeMode::Normal };
+		bool top_layer_only_view{ false };
 
 		std::map<EOptionType, bool> options_visibility{ {
 				{ EOptionType::Travels,         false },
diff --git a/src/slic3r/GUI/LibVGCode/ToolMarker.cpp b/src/slic3r/GUI/LibVGCode/ToolMarker.cpp
index 9e043c778e..33ad9b5596 100644
--- a/src/slic3r/GUI/LibVGCode/ToolMarker.cpp
+++ b/src/slic3r/GUI/LibVGCode/ToolMarker.cpp
@@ -174,6 +174,16 @@ void ToolMarker::set_position(const Vec3f& position)
     m_position = position;
 }
 
+float ToolMarker::get_offset_z() const
+{
+    return m_offset_z;
+}
+
+void ToolMarker::set_offset_z(float offset_z)
+{
+    m_offset_z = std::max(offset_z, 0.0f);
+}
+
 const Color& ToolMarker::get_color() const
 {
     return m_color;
diff --git a/src/slic3r/GUI/LibVGCode/ToolMarker.hpp b/src/slic3r/GUI/LibVGCode/ToolMarker.hpp
index 9c825d95cf..9c10e23d67 100644
--- a/src/slic3r/GUI/LibVGCode/ToolMarker.hpp
+++ b/src/slic3r/GUI/LibVGCode/ToolMarker.hpp
@@ -32,6 +32,9 @@ public:
     const Vec3f& get_position() const;
     void set_position(const Vec3f& position);
 
+    float get_offset_z() const;
+    void set_offset_z(float offset_z);
+
     const Color& get_color() const;
     void set_color(const Color& color);
 
@@ -40,6 +43,7 @@ public:
 
 private:
     Vec3f m_position{ 0.0f, 0.0f, 0.0f };
+    float m_offset_z{ 0.5f };
     Color m_color{ 1.0f, 1.0f, 1.0f };
     float m_alpha{ 0.5f };
 
diff --git a/src/slic3r/GUI/LibVGCode/Toolpaths.cpp b/src/slic3r/GUI/LibVGCode/Toolpaths.cpp
index 2d6af07b80..1ebc3ec1fe 100644
--- a/src/slic3r/GUI/LibVGCode/Toolpaths.cpp
+++ b/src/slic3r/GUI/LibVGCode/Toolpaths.cpp
@@ -48,7 +48,7 @@ static Vec3f toVec3f(const Eigen::Matrix<float, 3, 1, Eigen::DontAlign>& v)
 }
 //################################################################################################################################
 
-static const Color Dummy_Color{ 0.0f, 0.0f, 0.0f };
+static const Color Dummy_Color{ 0.25f, 0.25f, 0.25f };
 static const Color Default_Tool_Color{ 1.0f, 0.502f, 0.0f };
 
 static const std::map<EMoveType, Color> Options_Colors{ {
@@ -577,13 +577,18 @@ void Toolpaths::load(const Slic3r::GCodeProcessorResult& gcode_result, const std
 
     reset();
 
+    m_vertices_map.reserve(2 * gcode_result.moves.size());
     m_vertices.reserve(2 * gcode_result.moves.size());
+    uint32_t seams_count = 0;
     for (size_t i = 1; i < gcode_result.moves.size(); ++i) {
         const Slic3r::GCodeProcessorResult::MoveVertex& curr = gcode_result.moves[i];
         const Slic3r::GCodeProcessorResult::MoveVertex& prev = gcode_result.moves[i - 1];
         const EMoveType curr_type = valueof(curr.type);
         const EGCodeExtrusionRole curr_role = valueof(curr.extrusion_role);
 
+        if (curr_type == EMoveType::Seam)
+           ++seams_count;
+
         EGCodeExtrusionRole extrusion_role;
         if (curr_type == EMoveType::Travel) {
             // for travel moves set the extrusion role
@@ -615,14 +620,18 @@ void Toolpaths::load(const Slic3r::GCodeProcessorResult& gcode_result, const std
                     curr.temperature, curr.volumetric_rate(), extrusion_role, curr_type,
                     static_cast<uint8_t>(curr.extruder_id), static_cast<uint8_t>(curr.cp_color_id),
                     static_cast<uint32_t>(curr.layer_id) };
+                m_vertices_map.emplace_back(static_cast<uint32_t>(i) - seams_count);
                 m_vertices.emplace_back(vertex);
+                m_layers.update(static_cast<uint32_t>(curr.layer_id), static_cast<uint32_t>(m_vertices.size()));
             }
         }
 
         const PathVertex vertex = { toVec3f(curr.position), height, width, curr.feedrate, curr.fan_speed, curr.temperature,
             curr.volumetric_rate(), extrusion_role, curr_type, static_cast<uint8_t>(curr.extruder_id),
             static_cast<uint8_t>(curr.cp_color_id), static_cast<uint32_t>(curr.layer_id) };
+        m_vertices_map.emplace_back(static_cast<uint32_t>(i) - seams_count);
         m_vertices.emplace_back(vertex);
+        m_layers.update(static_cast<uint32_t>(curr.layer_id), static_cast<uint32_t>(m_vertices.size()));
 
         // updates calculation for center of gravity
         if (curr_type == EMoveType::Extrude &&
@@ -636,8 +645,11 @@ void Toolpaths::load(const Slic3r::GCodeProcessorResult& gcode_result, const std
             m_cog_marker.update(0.5f * (curr_pos + prev_pos), curr.mm3_per_mm * length(curr_pos - prev_pos));
         }
     }
+    m_vertices_map.shrink_to_fit();
     m_vertices.shrink_to_fit();
 
+    assert(m_vertices_map.size() == m_vertices.size());
+
     m_valid_lines_bitset = BitSet<>(m_vertices.size());
     m_valid_lines_bitset.setAll();
 
@@ -651,10 +663,8 @@ void Toolpaths::load(const Slic3r::GCodeProcessorResult& gcode_result, const std
     for (size_t i = 0; i < m_vertices.size(); ++i) {
         const PathVertex& v = m_vertices[i];
         const EMoveType move_type = v.type;
-
         const bool prev_line_valid = i > 0 && m_valid_lines_bitset[i - 1];
         const Vec3f prev_line = prev_line_valid ? v.position - m_vertices[i - 1].position : ZERO;
-
         const bool this_line_valid = i + 1 < m_vertices.size() &&
                                      m_vertices[i + 1].position != v.position &&
                                      m_vertices[i + 1].type == move_type &&
@@ -724,7 +734,9 @@ void Toolpaths::load(const Slic3r::GCodeProcessorResult& gcode_result, const std
             m_layers_times[i] = gcode_result.print_statistics.modes[i].layers_times;
     }
 
-    m_view_range.set_global_range(0, m_vertices.size() - 1);
+    if (!m_layers.empty())
+        set_layers_range(0, static_cast<uint32_t>(m_layers.size() - 1));
+    update_view_global_range();
     m_settings.update_colors = true;
 }
 
@@ -733,7 +745,8 @@ void Toolpaths::update_enabled_entities()
     std::vector<uint32_t> enabled_segments;
     std::vector<uint32_t> enabled_options;
 
-    for (uint32_t i = m_view_range.get_current_min(); i < m_view_range.get_current_max(); i++) {
+    const std::array<uint32_t, 2>& current_range = m_view_range.get_current_range();
+    for (uint32_t i = current_range[0]; i < current_range[1]; ++i) {
         const PathVertex& v = m_vertices[i];
 
         if (!m_valid_lines_bitset[i] && !v.is_option())
@@ -805,9 +818,11 @@ void Toolpaths::update_colors()
 {
     update_color_ranges();
 
+    const uint32_t top_layer_id = m_settings.top_layer_only_view ? m_layers_range.get()[1] : 0;
     std::vector<float> colors(m_vertices.size());
     for (size_t i = 0; i < m_vertices.size(); i++) {
-        colors[i] = encode_color(select_color(m_vertices[i]));
+      colors[i] = (m_vertices[i].layer_id < top_layer_id) ?
+          encode_color(Dummy_Color) : encode_color(select_color(m_vertices[i]));
     }
 
     // update gpu buffer for colors
@@ -819,6 +834,11 @@ void Toolpaths::update_colors()
 
 void Toolpaths::render(const Mat4x4f& view_matrix, const Mat4x4f& projection_matrix)
 {
+    if (m_settings.update_view_global_range) {
+        update_view_global_range();
+        m_settings.update_view_global_range = false;
+    }
+
     if (m_settings.update_enabled_entities) {
         update_enabled_entities();
         m_settings.update_enabled_entities = false;
@@ -855,6 +875,16 @@ ETimeMode Toolpaths::get_time_mode() const
     return m_settings.time_mode;
 }
 
+const std::array<uint32_t, 2>& Toolpaths::get_layers_range() const
+{
+    return m_layers_range.get();
+}
+
+bool Toolpaths::is_top_layer_only_view() const
+{
+    return m_settings.top_layer_only_view;
+}
+
 bool Toolpaths::is_option_visible(EOptionType type) const
 {
     try
@@ -891,12 +921,32 @@ void Toolpaths::set_time_mode(ETimeMode mode)
     m_settings.update_colors = true;
 }
 
+void Toolpaths::set_layers_range(const std::array<uint32_t, 2>& range)
+{
+    set_layers_range(range[0], range[1]);
+}
+
+void Toolpaths::set_layers_range(uint32_t min, uint32_t max)
+{
+    m_layers_range.set(min, max);
+    m_settings.update_view_global_range = true;
+    m_settings.update_enabled_entities = true;
+}
+
+void Toolpaths::set_top_layer_only_view(bool top_layer_only_view)
+{
+    m_settings.top_layer_only_view = top_layer_only_view;
+    m_settings.update_colors = true;
+}
+
 void Toolpaths::toggle_option_visibility(EOptionType type)
 {
     try
     {
         bool& value = m_settings.options_visibility.at(type);
         value = !value;
+        if (type == EOptionType::Travels)
+            m_settings.update_view_global_range = true;
         m_settings.update_enabled_entities = true;
         m_settings.update_colors = true;
     }
@@ -921,20 +971,51 @@ void Toolpaths::toggle_extrusion_role_visibility(EGCodeExtrusionRole role)
     }
 }
 
-const std::array<size_t, 2>& Toolpaths::get_view_current_range() const
+const std::array<uint32_t, 2>& Toolpaths::get_view_current_range() const
 {
     return m_view_range.get_current_range();
 }
 
-const std::array<size_t, 2>& Toolpaths::get_view_global_range() const
+const std::array<uint32_t, 2>& Toolpaths::get_view_global_range() const
 {
     return m_view_range.get_global_range();
 }
 
-void Toolpaths::set_view_current_range(size_t min, size_t max)
+void Toolpaths::set_view_current_range(uint32_t min, uint32_t max)
 {
-    m_view_range.set_current_range(min, max);
-    m_settings.update_enabled_entities = true;
+    uint32_t min_id = 0;
+    for (size_t i = 0; i < m_vertices_map.size(); ++i) {
+        if (m_vertices_map[i] < min)
+            min_id = static_cast<uint32_t>(i);
+        else
+            break;
+    }
+    ++min_id;
+
+    uint32_t max_id = min_id;
+    if (max > min) {
+        for (size_t i = static_cast<size_t>(min_id); i < m_vertices_map.size(); ++i) {
+            if (m_vertices_map[i] < max)
+                max_id = static_cast<uint32_t>(i);
+            else
+                break;
+        }
+        ++max_id;
+    }
+
+    if (max_id < m_vertices_map.size() - 1 &&
+        m_vertices[max_id + 1].type == m_vertices[max_id].type &&
+        m_vertices_map[max_id + 1] == m_vertices_map[max_id])
+        ++max_id;
+
+    Range new_range;
+    new_range.set(min_id, max_id);
+
+    if (m_old_current_range != new_range) {
+        m_view_range.set_current_range(new_range);
+        m_old_current_range = new_range;
+        m_settings.update_enabled_entities = true;
+    }
 }
 
 const std::array<std::vector<float>, static_cast<size_t>(ETimeMode::COUNT)>& Toolpaths::get_layers_times() const
@@ -957,6 +1038,11 @@ const Vec3f& Toolpaths::get_tool_marker_position() const
     return m_tool_marker.get_position();
 }
 
+float Toolpaths::get_tool_marker_offset_z() const
+{
+    return m_tool_marker.get_offset_z();
+}
+
 float Toolpaths::get_tool_marker_scale_factor() const
 {
     return m_tool_marker_scale_factor;
@@ -982,6 +1068,11 @@ void Toolpaths::set_tool_marker_position(const Vec3f& position)
     m_tool_marker.set_position(position);
 }
 
+void Toolpaths::set_tool_marker_offset_z(float offset_z)
+{
+    m_tool_marker.set_offset_z(offset_z);
+}
+
 void Toolpaths::set_tool_marker_scale_factor(float factor)
 {
     m_tool_marker_scale_factor = std::max(factor, 0.001f);
@@ -1015,7 +1106,12 @@ static void delete_buffers(unsigned int& id)
 
 void Toolpaths::reset()
 {
+    m_layers.reset();
+    m_layers_range.reset();
+    m_view_range.reset();
+    m_old_current_range.reset();
     m_vertices.clear();
+    m_vertices_map.clear();
     m_valid_lines_bitset.clear();
 
     m_layers_times = std::array<std::vector<float>, (uint8_t)ETimeMode::COUNT>();
@@ -1036,6 +1132,53 @@ void Toolpaths::reset()
     delete_buffers(m_positions_buf_id);
 }
 
+void Toolpaths::update_view_global_range()
+{
+    const std::array<uint32_t, 2>& layers_range = m_layers_range.get();
+    const bool travels_visible = m_settings.options_visibility.at(EOptionType::Travels);
+
+    auto first_it = m_vertices.begin();
+    while (first_it != m_vertices.end() && (
+           first_it->layer_id < layers_range[0] ||
+           first_it->is_option() ||
+           (first_it->is_travel() && !travels_visible))) {
+        ++first_it;
+    }
+
+    if (first_it == m_vertices.end())
+        m_view_range.set_global_range(0, 0);
+    else {
+        if (travels_visible) {
+            // if the global range starts with a travel move, extend it to the travel start
+            while (first_it != m_vertices.begin() && first_it->is_travel()) {
+                --first_it;
+            }
+        }
+
+        auto last_it = first_it;
+        while (last_it != m_vertices.end() && last_it->layer_id <= layers_range[1]) {
+            ++last_it;
+        }
+
+        // remove trailing options, if any
+        auto rev_first_it = std::make_reverse_iterator(first_it);
+        auto rev_last_it = std::make_reverse_iterator(last_it);
+        while (rev_last_it != rev_first_it && rev_last_it->is_option()) {
+            ++rev_last_it;
+        }
+
+        last_it = rev_last_it.base();
+        if (travels_visible) {
+            // if the global range ends with a travel move, extend it to the travel end
+            while (last_it != m_vertices.end() && last_it->is_travel()) {
+                ++last_it;
+            }
+        }
+
+        m_view_range.set_global_range(std::distance(m_vertices.begin(), first_it), std::distance(m_vertices.begin(), last_it));
+    }
+}
+
 void Toolpaths::update_color_ranges()
 {
     m_width_range.reset();
@@ -1298,7 +1441,10 @@ void Toolpaths::render_tool_marker(const Mat4x4f& view_matrix, const Mat4x4f& pr
 
     glsafe(glUseProgram(m_tool_marker_shader_id));
 
-    glsafe(glUniform3fv(m_uni_tool_marker_world_origin, 1, m_tool_marker.get_position().data()));
+    const Vec3f& origin = m_tool_marker.get_position();
+    const Vec3f offset = { 0.0f, 0.0f, m_tool_marker.get_offset_z() };
+    const Vec3f position = origin + offset;
+    glsafe(glUniform3fv(m_uni_tool_marker_world_origin, 1, position.data()));
     glsafe(glUniform1f(m_uni_tool_marker_scale_factor, m_tool_marker_scale_factor));
     glsafe(glUniformMatrix4fv(m_uni_tool_marker_view_matrix, 1, GL_FALSE, view_matrix.data()));
     glsafe(glUniformMatrix4fv(m_uni_tool_marker_projection_matrix, 1, GL_FALSE, projection_matrix.data()));
@@ -1348,11 +1494,25 @@ void Toolpaths::render_debug_window()
 
         ImGui::TableNextRow();
         ImGui::TableSetColumnIndex(0);
-        imgui.text_colored(Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT, "sequential range");
+        imgui.text_colored(Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT, "layers range");
         ImGui::TableSetColumnIndex(1);
-        const std::array<size_t, 2>& current_view_range = get_view_current_range();
+        const std::array<uint32_t, 2>& layers_range = get_layers_range();
+        imgui.text(std::to_string(layers_range[0]) + " - " + std::to_string(layers_range[1]));
+
+        ImGui::TableNextRow();
+        ImGui::TableSetColumnIndex(0);
+        imgui.text_colored(Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT, "view range (current)");
+        ImGui::TableSetColumnIndex(1);
+        const std::array<uint32_t, 2>& current_view_range = get_view_current_range();
         imgui.text(std::to_string(current_view_range[0]) + " - " + std::to_string(current_view_range[1]));
 
+        ImGui::TableNextRow();
+        ImGui::TableSetColumnIndex(0);
+        imgui.text_colored(Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT, "view range (global)");
+        ImGui::TableSetColumnIndex(1);
+        const std::array<uint32_t, 2>& global_view_range = get_view_global_range();
+        imgui.text(std::to_string(global_view_range[0]) + " - " + std::to_string(global_view_range[1]));
+
         auto add_range_property_row = [&imgui](const std::string& label, const std::array<float, 2>& range) {
             ImGui::TableNextRow();
             ImGui::TableSetColumnIndex(0);
@@ -1397,6 +1557,14 @@ void Toolpaths::render_debug_window()
             ImGui::TableSetColumnIndex(1);
             imgui.text(std::to_string(get_tool_marker_scale_factor()));
 
+            ImGui::TableNextRow();
+            ImGui::TableSetColumnIndex(0);
+            imgui.text_colored(Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT, "Tool marker z offset");
+            ImGui::TableSetColumnIndex(1);
+            float tool_z_offset = get_tool_marker_offset_z();
+            if (imgui.slider_float("##ToolZOffset", &tool_z_offset, 0.0f, 1.0f))
+                set_tool_marker_offset_z(tool_z_offset);
+
             ImGui::TableNextRow();
             ImGui::TableSetColumnIndex(0);
             imgui.text_colored(Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT, "Tool marker color");
@@ -1418,6 +1586,46 @@ void Toolpaths::render_debug_window()
     }
 
     imgui.end();
+
+    auto to_string = [](EMoveType type) {
+        switch (type)
+        {
+        case EMoveType::Noop:        { return "Noop"; }
+        case EMoveType::Retract:     { return "Retract"; }
+        case EMoveType::Unretract:   { return "Unretract"; }
+        case EMoveType::Seam:        { return "Seam"; }
+        case EMoveType::ToolChange:  { return "ToolChange"; }
+        case EMoveType::ColorChange: { return "ColorChange"; }
+        case EMoveType::PausePrint:  { return "PausePrint"; }
+        case EMoveType::CustomGCode: { return "CustomGCode"; }
+        case EMoveType::Travel:      { return "Travel"; }
+        case EMoveType::Wipe:        { return "Wipe"; }
+        case EMoveType::Extrude:     { return "Extrude"; }
+        default:                     { return "Error"; }
+        }
+    };
+
+    imgui.begin(std::string("LibVGCode Viewer Vertices"), ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse);
+    if (ImGui::BeginTable("VertexData", 4)) {
+        uint32_t counter = 0;
+        for (size_t i = 0; i < m_vertices.size(); ++i) {
+            const PathVertex& v = m_vertices[i];
+            ImGui::TableNextRow();
+            ImGui::TableSetColumnIndex(0);
+            imgui.text_colored(m_valid_lines_bitset[i] ? Slic3r::GUI::ImGuiWrapper::COL_ORANGE_LIGHT : Slic3r::GUI::ImGuiWrapper::COL_GREY_LIGHT, std::to_string(++counter));
+            ImGui::TableSetColumnIndex(1);
+            imgui.text(to_string(v.type));
+
+            ImGui::TableSetColumnIndex(2);
+            imgui.text(std::to_string(m_vertices_map[i]));
+
+            ImGui::TableSetColumnIndex(3);
+            imgui.text(std::to_string(v.position[0]) + ", " + std::to_string(v.position[1]) + ", " + std::to_string(v.position[2]));
+        }
+
+        ImGui::EndTable();
+    }
+    imgui.end();
 }
 //################################################################################################################################
 
diff --git a/src/slic3r/GUI/LibVGCode/Toolpaths.hpp b/src/slic3r/GUI/LibVGCode/Toolpaths.hpp
index f3b86e3ce2..a6906b310b 100644
--- a/src/slic3r/GUI/LibVGCode/Toolpaths.hpp
+++ b/src/slic3r/GUI/LibVGCode/Toolpaths.hpp
@@ -19,6 +19,7 @@
 #include "Bitset.hpp"
 #include "ColorRange.hpp"
 #include "ViewRange.hpp"
+#include "Layers.hpp"
 
 #include <vector>
 #include <array>
@@ -73,6 +74,8 @@ public:
     //
     EViewType get_view_type() const;
     ETimeMode get_time_mode() const;
+    const std::array<uint32_t, 2>& get_layers_range() const;
+    bool is_top_layer_only_view() const;
     bool is_option_visible(EOptionType type) const;
     bool is_extrusion_role_visible(EGCodeExtrusionRole role) const;
 
@@ -81,19 +84,22 @@ public:
     //
     void set_view_type(EViewType type);
     void set_time_mode(ETimeMode mode);
+    void set_layers_range(const std::array<uint32_t, 2>& range);
+    void set_layers_range(uint32_t min, uint32_t max);
+    void set_top_layer_only_view(bool top_layer_only_view);
     void toggle_option_visibility(EOptionType type);
     void toggle_extrusion_role_visibility(EGCodeExtrusionRole role);
 
     //
     // View range getters
     //
-    const std::array<size_t, 2>& get_view_current_range() const;
-    const std::array<size_t, 2>& get_view_global_range() const;
+    const std::array<uint32_t, 2>& get_view_current_range() const;
+    const std::array<uint32_t, 2>& get_view_global_range() const;
 
     //
     // View range setters
     //
-    void set_view_current_range(size_t min, size_t max);
+    void set_view_current_range(uint32_t min, uint32_t max);
 
     //
     // Properties getters
@@ -102,6 +108,7 @@ public:
     Vec3f get_cog_marker_position() const;
     float get_cog_marker_scale_factor() const;
     const Vec3f& get_tool_marker_position() const;
+    float get_tool_marker_offset_z() const;
     float get_tool_marker_scale_factor() const;
     const Color& get_tool_marker_color() const;
     float get_tool_marker_alpha() const;
@@ -111,13 +118,17 @@ public:
     //
     void set_cog_marker_scale_factor(float factor);
     void set_tool_marker_position(const Vec3f& position);
+    void set_tool_marker_offset_z(float offset_z);
     void set_tool_marker_scale_factor(float factor);
     void set_tool_marker_color(const Color& color);
     void set_tool_marker_alpha(float size);
 
 private:
     Settings m_settings;
+    Layers m_layers;
+    Range m_layers_range;
     ViewRange m_view_range;
+    Range m_old_current_range;
 
     //
     // The OpenGL element used to represent all toolpath segments
@@ -145,6 +156,7 @@ private:
     // cpu buffer to store vertices
     //
     std::vector<PathVertex> m_vertices;
+    std::vector<uint32_t> m_vertices_map;
 //################################################################################################################################
     // Debug
     std::pair<uint32_t, uint32_t> m_enabled_segments_range{ 0, 0 };
@@ -246,6 +258,7 @@ private:
     unsigned int m_enabled_options_tex_id{ 0 };
 
     void reset();
+    void update_view_global_range();
     void update_color_ranges();
     Color select_color(const PathVertex& v) const;
     void render_segments(const Mat4x4f& view_matrix, const Mat4x4f& projection_matrix, const Vec3f& camera_position);
diff --git a/src/slic3r/GUI/LibVGCode/ViewRange.cpp b/src/slic3r/GUI/LibVGCode/ViewRange.cpp
index d7926c1bc2..ec19d6cbf5 100644
--- a/src/slic3r/GUI/LibVGCode/ViewRange.cpp
+++ b/src/slic3r/GUI/LibVGCode/ViewRange.cpp
@@ -14,55 +14,56 @@
 #if ENABLE_NEW_GCODE_VIEWER
 //################################################################################################################################
 
-#include <assert.h>
 #include <algorithm>
 
 namespace libvgcode {
 
-size_t ViewRange::get_current_min() const
+const std::array<uint32_t, 2>& ViewRange::get_current_range() const
 {
-		return m_current[0];
+		return m_current.get();
 }
 
-size_t ViewRange::get_current_max() const
+void ViewRange::set_current_range(const Range& other)
 {
-		return m_current[1];
+		set_current_range(other.get());
 }
 
-const std::array<size_t, 2>& ViewRange::get_current_range() const
+void ViewRange::set_current_range(const std::array<uint32_t, 2>& range)
 {
-		return m_current;
+		set_current_range(range[0], range[1]);
 }
 
-void ViewRange::set_current_range(size_t min, size_t max)
+void ViewRange::set_current_range(uint32_t min, uint32_t max)
 {
-		assert(min <= max);
-		m_current[0] = std::clamp(min, m_global[0], m_global[1]);
-		m_current[1] = std::clamp(max, m_global[0], m_global[1]);
+		m_current.set(min, max);
+		m_global.clamp(m_current);
 }
 
-size_t ViewRange::get_global_min() const
+const std::array<uint32_t, 2>& ViewRange::get_global_range() const
 {
-		return m_global[0];
+		return m_global.get();
 }
 
-size_t ViewRange::get_global_max() const
+void ViewRange::set_global_range(const Range& other)
 {
-		return m_global[1];
+		set_global_range(other.get());
 }
 
-const std::array<size_t, 2>& ViewRange::get_global_range() const
+void ViewRange::set_global_range(const std::array<uint32_t, 2>& range)
 {
-		return m_global;
+		set_global_range(range[0], range[1]);
 }
 
-void ViewRange::set_global_range(size_t min, size_t max)
+void ViewRange::set_global_range(uint32_t min, uint32_t max)
 {
-		assert(min <= max);
-		m_global[0] = min;
-		m_global[1] = max;
-		m_current[0] = std::clamp(m_current[0], m_global[0], m_global[1]);
-		m_current[1] = std::clamp(m_current[1], m_global[0], m_global[1]);
+		m_global.set(min, max);
+		m_global.clamp(m_current);
+}
+
+void ViewRange::reset()
+{
+		m_global.reset();
+		m_global.reset();
 }
 
 } // namespace libvgcode
diff --git a/src/slic3r/GUI/LibVGCode/ViewRange.hpp b/src/slic3r/GUI/LibVGCode/ViewRange.hpp
index ecc08008ef..ade871d70b 100644
--- a/src/slic3r/GUI/LibVGCode/ViewRange.hpp
+++ b/src/slic3r/GUI/LibVGCode/ViewRange.hpp
@@ -10,28 +10,28 @@
 #if ENABLE_NEW_GCODE_VIEWER
 //################################################################################################################################
 
-#include <array>
+#include "Range.hpp"
 
 namespace libvgcode {
 
 class ViewRange
 {
 public:
-		size_t get_current_min() const;
-		size_t get_current_max() const;
+		const std::array<uint32_t, 2>& get_current_range() const;
+		void set_current_range(const Range& other);
+		void set_current_range(const std::array<uint32_t, 2>& range);
+		void set_current_range(uint32_t min, uint32_t max);
 
-		const std::array<size_t, 2>& get_current_range() const;
-		void set_current_range(size_t min, size_t max);
+		const std::array<uint32_t, 2>& get_global_range() const;
+		void set_global_range(const Range& other);
+		void set_global_range(const std::array<uint32_t, 2>& range);
+		void set_global_range(uint32_t min, uint32_t max);
 
-		size_t get_global_min() const;
-		size_t get_global_max() const;
-
-		const std::array<size_t, 2>& get_global_range() const;
-		void set_global_range(size_t min, size_t max);
+		void reset();
 
 private:
-		std::array<size_t, 2> m_current{ 0, 0 };
-		std::array<size_t, 2> m_global{ 0, 0 };
+		Range m_current;
+		Range m_global;
 };
 
 } // namespace libvgcode
diff --git a/src/slic3r/GUI/LibVGCode/Viewer.cpp b/src/slic3r/GUI/LibVGCode/Viewer.cpp
index 30e90b80b4..b9fbabd359 100644
--- a/src/slic3r/GUI/LibVGCode/Viewer.cpp
+++ b/src/slic3r/GUI/LibVGCode/Viewer.cpp
@@ -53,6 +53,31 @@ void Viewer::set_time_mode(ETimeMode mode)
     m_toolpaths.set_time_mode(mode);
 }
 
+const std::array<uint32_t, 2>& Viewer::get_layers_range() const
+{
+    return m_toolpaths.get_layers_range();
+}
+
+void Viewer::set_layers_range(const std::array<uint32_t, 2>& range)
+{
+    m_toolpaths.set_layers_range(range);
+}
+
+void Viewer::set_layers_range(uint32_t min, uint32_t max)
+{
+    m_toolpaths.set_layers_range(min, max);
+}
+
+bool Viewer::is_top_layer_only_view() const
+{
+    return m_toolpaths.is_top_layer_only_view();
+}
+
+void Viewer::set_top_layer_only_view(bool top_layer_only_view)
+{
+    m_toolpaths.set_top_layer_only_view(top_layer_only_view);
+}
+
 const std::array<std::vector<float>, static_cast<size_t>(ETimeMode::COUNT)>& Viewer::get_layers_times() const
 {
     return m_toolpaths.get_layers_times();
@@ -78,17 +103,17 @@ void Viewer::toggle_extrusion_role_visibility(EGCodeExtrusionRole role)
     m_toolpaths.toggle_extrusion_role_visibility(role);
 }
 
-const std::array<size_t, 2>& Viewer::get_view_current_range() const
+const std::array<uint32_t, 2>& Viewer::get_view_current_range() const
 {
     return m_toolpaths.get_view_current_range();
 }
 
-const std::array<size_t, 2>& Viewer::get_view_global_range() const
+const std::array<uint32_t, 2>& Viewer::get_view_global_range() const
 {
     return m_toolpaths.get_view_global_range();
 }
 
-void Viewer::set_view_current_range(size_t min, size_t max)
+void Viewer::set_view_current_range(uint32_t min, uint32_t max)
 {
     m_toolpaths.set_view_current_range(min, max);
 }
diff --git a/src/slic3r/GUI/LibVGCode/Viewer.hpp b/src/slic3r/GUI/LibVGCode/Viewer.hpp
index 1f5aea98b3..1589b10017 100644
--- a/src/slic3r/GUI/LibVGCode/Viewer.hpp
+++ b/src/slic3r/GUI/LibVGCode/Viewer.hpp
@@ -42,6 +42,13 @@ public:
     ETimeMode get_time_mode() const;
     void set_time_mode(ETimeMode mode);
 
+    const std::array<uint32_t, 2>& get_layers_range() const;
+    void set_layers_range(const std::array<uint32_t, 2>& range);
+    void set_layers_range(uint32_t min, uint32_t max);
+
+    bool is_top_layer_only_view() const;
+    void set_top_layer_only_view(bool top_layer_only_view);
+
     const std::array<std::vector<float>, static_cast<size_t>(ETimeMode::COUNT)>& get_layers_times() const;
 
     bool is_option_visible(EOptionType type) const;
@@ -50,13 +57,13 @@ public:
     bool is_extrusion_role_visible(EGCodeExtrusionRole role) const;
     void toggle_extrusion_role_visibility(EGCodeExtrusionRole role);
 
-    const std::array<size_t, 2>& get_view_current_range() const;
-    const std::array<size_t, 2>& get_view_global_range() const;
+    const std::array<uint32_t, 2>& get_view_current_range() const;
+    const std::array<uint32_t, 2>& get_view_global_range() const;
     //
     // min must be smaller than max
     // values are clamped to the view global range
     // 
-    void set_view_current_range(size_t min, size_t max);
+    void set_view_current_range(uint32_t min, uint32_t max);
 
     //
     // Returns the position of the center of gravity of the toolpaths.