diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 765c8b8c11..dcd4d2ab11 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -601,6 +601,9 @@ void GCode::_do_export(Print &print, FILE *file, GCodePreviewData *preview_data)
     this->apply_print_config(print.config());
     this->set_extruders(print.extruders());
     
+    // Initialize colorprint.
+    m_colorprint_heights = cast<float>(print.config().colorprint_heights.values);
+
     // Initialize autospeed.
     {
         // get the minimum cross-section used in the print
@@ -1319,6 +1322,18 @@ void GCode::process_layer(
         m_second_layer_things_done = true;
     }
 
+    // Let's issue a filament change command if requested at this layer.
+    // In case there are more toolchange requests that weren't done yet and should happen simultaneously, erase them all.
+    // (Layers can be close to each other, model could have been resliced with bigger layer height, ...).
+    bool colorprint_change = false;
+    while (!m_colorprint_heights.empty() && m_colorprint_heights.front()-EPSILON < layer.print_z) {
+        m_colorprint_heights.erase(m_colorprint_heights.begin());
+        colorprint_change = true;
+    }
+    if (colorprint_change)
+        gcode += "M600\n";
+
+
     // Extrude skirt at the print_z of the raft layers and normal object layers
     // not at the print_z of the interlaced support material layers.
     bool extrude_skirt = 
diff --git a/src/libslic3r/GCode.hpp b/src/libslic3r/GCode.hpp
index 45f17a68ae..bf65311db4 100644
--- a/src/libslic3r/GCode.hpp
+++ b/src/libslic3r/GCode.hpp
@@ -317,6 +317,9 @@ protected:
     bool                                m_second_layer_things_done;
     // Index of a last object copy extruded.
     std::pair<const PrintObject*, Point> m_last_obj_copy;
+    // Layer heights for colorprint - updated before the export and erased during the process
+    // so no toolchange occurs twice.
+    std::vector<float> m_colorprint_heights;
 
     // Time estimators
     GCodeTimeEstimator m_normal_time_estimator;
diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index d1a942f3f6..41e5f067d6 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -124,6 +124,7 @@ bool Print::invalidate_state_by_config_options(const std::vector<t_config_option
         "between_objects_gcode",
         "bridge_acceleration",
         "bridge_fan_speed",
+        "colorprint_heights",
         "cooling",
         "default_acceleration",
         "deretract_speed",
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 4e1de09919..374ae7d342 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -192,6 +192,12 @@ void PrintConfigDef::init_fff_params()
     def->mode = comExpert;
     def->default_value = new ConfigOptionBool(false);
 
+    def = this->add("colorprint_heights", coFloats);
+    def->label = L("Colorprint height");
+    def->tooltip = L("Heights at which a filament change is to occur. ");
+    def->cli = "colorprint-heights=f@";
+    def->default_value = new ConfigOptionFloats { };
+
     def = this->add("compatible_printers", coStrings);
     def->label = L("Compatible printers");
     def->mode = comAdvanced;
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index d92b3758dd..87a882c641 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -704,6 +704,7 @@ public:
     ConfigOptionInts                bridge_fan_speed;
     ConfigOptionFloat               brim_width;
     ConfigOptionBool                complete_objects;
+    ConfigOptionFloats              colorprint_heights;
     ConfigOptionBools               cooling;
     ConfigOptionFloat               default_acceleration;
     ConfigOptionInts                disable_fan_first_layers;
@@ -781,6 +782,7 @@ protected:
         OPT_PTR(bridge_fan_speed);
         OPT_PTR(brim_width);
         OPT_PTR(complete_objects);
+        OPT_PTR(colorprint_heights);
         OPT_PTR(cooling);
         OPT_PTR(default_acceleration);
         OPT_PTR(disable_fan_first_layers);
diff --git a/src/slic3r/GUI/GUI_Preview.cpp b/src/slic3r/GUI/GUI_Preview.cpp
index 5618eab043..78f8b7462c 100644
--- a/src/slic3r/GUI/GUI_Preview.cpp
+++ b/src/slic3r/GUI/GUI_Preview.cpp
@@ -1,5 +1,6 @@
 #include "../../libslic3r/libslic3r.h"
 #include "GUI_Preview.hpp"
+#include "GUI_App.hpp"
 #include "GUI.hpp"
 #include "AppConfig.hpp"
 #include "3DScene.hpp"
@@ -22,6 +23,7 @@
 namespace Slic3r {
 namespace GUI {
 
+
 Preview::Preview(wxNotebook* notebook, DynamicPrintConfig* config, Print* print, GCodePreviewData* gcode_preview_data)
     : m_canvas(nullptr)
     , m_double_slider_sizer(nullptr)
@@ -482,6 +484,11 @@ void Preview::create_double_slider()
         if (IsShown())
             m_canvas->Refresh();
     });
+
+    Bind(wxCUSTOMEVT_TICKSCHANGED, [this](wxEvent&) {
+            auto& config = wxGetApp().preset_bundle->project_config;
+            ((config.option<ConfigOptionFloats>("colorprint_heights"))->values) = (m_slider->GetTicksValues());
+        });
 }
 
 void Preview::update_double_slider(bool force_sliders_full_range)
@@ -495,6 +502,11 @@ void Preview::update_double_slider(bool force_sliders_full_range)
     m_slider->SetMaxValue(layers_z.size() - 1);
     m_slider->SetSliderValues(values);
 
+    const auto& config = wxGetApp().preset_bundle->project_config;
+    const std::vector<double> &ticks_from_config = (config.option<ConfigOptionFloats>("colorprint_heights"))->values;
+
+    m_slider->SetTicksValues(ticks_from_config);
+
     set_double_slider_thumbs(force_sliders_full_range, layers_z, z_low, z_high);
 }
 
@@ -515,6 +527,15 @@ void Preview::fill_slider_values(std::vector<std::pair<int, double>> &values,
                     break;
                 }
     }
+
+    // All ticks that would end up outside the slider range should be erased.
+    // TODO: this should probably be placed into more appropriate part of code,
+    //  this way it relies on the Preview tab being active.
+    auto& config = wxGetApp().preset_bundle->project_config;
+    std::vector<double> &ticks_from_config = (config.option<ConfigOptionFloats>("colorprint_heights"))->values;
+    ticks_from_config.erase(std::remove_if(ticks_from_config.begin(), ticks_from_config.end(),
+                                           [values](double val) { return values.back().second < val; }),
+                            ticks_from_config.end());
 }
 
 void Preview::set_double_slider_thumbs(const bool force_sliders_full_range,
diff --git a/src/slic3r/GUI/PresetBundle.cpp b/src/slic3r/GUI/PresetBundle.cpp
index f22299b7ca..5e42501b66 100644
--- a/src/slic3r/GUI/PresetBundle.cpp
+++ b/src/slic3r/GUI/PresetBundle.cpp
@@ -36,6 +36,7 @@
 namespace Slic3r {
 
 static std::vector<std::string> s_project_options {
+    "colorprint_heights",
     "wiping_volumes_extruders",
     "wiping_volumes_matrix"
 };
diff --git a/src/slic3r/GUI/wxExtensions.cpp b/src/slic3r/GUI/wxExtensions.cpp
index cd6cf171fd..52b6a01e9e 100644
--- a/src/slic3r/GUI/wxExtensions.cpp
+++ b/src/slic3r/GUI/wxExtensions.cpp
@@ -11,6 +11,8 @@
 #include "GUI_ObjectList.hpp"
 #include "Model.hpp"
 
+wxDEFINE_EVENT(wxCUSTOMEVT_TICKSCHANGED, wxEvent);
+
 wxMenuItem* append_menu_item(wxMenu* menu, int id, const wxString& string, const wxString& description,
     std::function<void(wxCommandEvent& event)> cb, const std::string& icon, wxEvtHandler* event_handler)
 {
@@ -1189,7 +1191,6 @@ wxSize PrusaBitmapTextRenderer::GetSize() const
 // ----------------------------------------------------------------------------
 // PrusaDoubleSlider
 // ----------------------------------------------------------------------------
-
 PrusaDoubleSlider::PrusaDoubleSlider(wxWindow *parent,
                                         wxWindowID id,
                                         int lowerValue, 
@@ -1371,6 +1372,34 @@ double PrusaDoubleSlider::get_double_value(const SelectedSlider& selection) cons
     return m_values[selection == ssLower ? m_lower_value : m_higher_value].second;
 }
 
+std::vector<double> PrusaDoubleSlider::GetTicksValues() const
+{
+    std::vector<double> values;
+
+    if (!m_values.empty())
+        for (auto tick : m_ticks)
+            values.push_back(m_values[tick].second);
+
+    return values;
+}
+
+void PrusaDoubleSlider::SetTicksValues(const std::vector<double>& heights)
+{
+    if (m_values.empty())
+        return;
+
+    m_ticks.clear();
+    unsigned int i = 0;
+    for (auto h : heights) {
+        while (i < m_values.size() && m_values[i].second - 1e-6 < h)
+            ++i;
+        if (i == m_values.size())
+            return;
+        m_ticks.insert(i);
+    }
+
+}
+
 void PrusaDoubleSlider::get_lower_and_higher_position(int& lower_pos, int& higher_pos)
 {
     const double step = get_scroll_step();
@@ -1795,10 +1824,13 @@ void PrusaDoubleSlider::action_tick(const TicksAction action)
             m_ticks.insert(tick);
         else if (it != m_ticks.end() && action == taDel)
             m_ticks.erase(tick);
-        else
+        else {
+            wxPostEvent(this->GetParent(), wxCommandEvent(wxCUSTOMEVT_TICKSCHANGED));
             return;
+        }
     }
 
+    wxPostEvent(this->GetParent(), wxCommandEvent(wxCUSTOMEVT_TICKSCHANGED));
     Refresh();
     Update();
 }
diff --git a/src/slic3r/GUI/wxExtensions.hpp b/src/slic3r/GUI/wxExtensions.hpp
index 6293fb9628..e5e4600da7 100644
--- a/src/slic3r/GUI/wxExtensions.hpp
+++ b/src/slic3r/GUI/wxExtensions.hpp
@@ -622,6 +622,9 @@ private:
 // PrusaDoubleSlider
 // ----------------------------------------------------------------------------
 
+// custom message the slider sends to its parent to notify a tick-change:
+wxDECLARE_EVENT(wxCUSTOMEVT_TICKSCHANGED, wxEvent);
+
 enum SelectedSlider {
     ssUndef,
     ssLower,
@@ -632,6 +635,7 @@ enum TicksAction{
     taAdd,
     taDel
 };
+
 class PrusaDoubleSlider : public wxControl
 {
 public:
@@ -669,6 +673,8 @@ public:
         m_values = values;
     }
     void ChangeOneLayerLock();
+    std::vector<double> GetTicksValues() const;
+    void SetTicksValues(const std::vector<double>& heights);
 
     void OnPaint(wxPaintEvent& ) { render();}
     void OnLeftDown(wxMouseEvent& event);