diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index 3e1a8eed41..baec0f0869 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -17,6 +17,8 @@ set(SLIC3R_GUI_SOURCES
     pchheader.hpp
     GUI/AboutDialog.cpp
     GUI/AboutDialog.hpp
+    GUI/ArrangeHelper.cpp
+    GUI/ArrangeHelper.hpp
     GUI/ArrangeSettingsDialogImgui.hpp
     GUI/ArrangeSettingsDialogImgui.cpp
     GUI/UserAccountCommunication.cpp
diff --git a/src/slic3r/GUI/ArrangeHelper.cpp b/src/slic3r/GUI/ArrangeHelper.cpp
new file mode 100644
index 0000000000..5b39409eab
--- /dev/null
+++ b/src/slic3r/GUI/ArrangeHelper.cpp
@@ -0,0 +1,218 @@
+#include "ArrangeHelper.hpp"
+
+#include "libslic3r/Model.hpp"
+#include "libslic3r/TriangleMesh.hpp"
+
+#include "boost/algorithm/string/split.hpp"
+#include "boost/filesystem/path.hpp"
+
+#include <string>
+
+
+namespace Slic3r {
+
+
+
+static bool find_and_remove(std::string& src, const std::string& key)
+{
+	size_t pos = src.find(key);
+	if (pos != std::string::npos) {
+		src.erase(pos, key.length());
+		return true;
+	}
+	return false;
+}
+
+struct ObjectToPrint {
+	int id = 0;
+	coord_t total_height = 0;
+	std::vector<std::pair<coord_t, Polygon>> pgns_at_height;
+};
+
+std::vector<ObjectToPrint> load_exported_data(const std::string& filename)
+{
+	std::vector<ObjectToPrint> objects_to_print;
+
+	std::ifstream in(filename);
+	if (! in)
+		throw std::runtime_error("NO EXPORTED FILE WAS FOUND");
+	std::string line;
+
+	while (in) {		
+		std::getline(in, line);
+		if (find_and_remove(line, "OBJECT_ID")) {
+			objects_to_print.push_back(ObjectToPrint());
+		    objects_to_print.back().id = std::stoi(line);
+		}
+		if (find_and_remove(line, "TOTAL_HEIGHT"))
+			objects_to_print.back().total_height = std::stoi(line);
+		if (find_and_remove(line, "POLYGON_AT_HEIGHT"))
+			objects_to_print.back().pgns_at_height.emplace_back(std::make_pair(std::stoi(line), Polygon()));
+		if (find_and_remove(line, "POINT")) {
+			std::stringstream ss(line);
+			std::string val;
+			ss >> val;
+			Point pt(std::stoi(val), 0);
+			ss >> val;
+			pt.y() = std::stoi(val);
+			objects_to_print.back().pgns_at_height.back().second.append(pt);
+		}
+	}
+	return objects_to_print;
+}
+
+std::vector<double> read_required_heights()
+{
+	std::vector<double> heights;
+	std::ifstream out("printer_geometry.mk4.txt");
+	std::string line;
+	std::array<std::string, 2> keys = {"CONVEX_HEIGHT", "BOX_HEIGHT"};
+	while (out) {
+		std::getline(out, line);
+		for (const std::string& key : keys) {
+			if (size_t pos = line.find(key); pos != std::string::npos) {
+				line = line.substr(pos + key.size());
+				heights.push_back(double(std::stoi(line)) * SCALING_FACTOR);
+				break;
+			}
+		}
+	}
+	return heights;
+}
+
+
+
+void export_arrange_data(const Model& model, const std::vector<double>& heights)
+{
+	std::ofstream out("arrange_data_export.txt");
+	for (const ModelObject* mo : model.objects) {
+		// Calculate polygon describing convex hull of everything above given heights.
+		const ModelInstance* mi = mo->instances.front();
+		out << "OBJECT_ID" << mo->id().id << std::endl;
+		out << "TOTAL_HEIGHT" << scaled(mo->instance_bounding_box(0).size().z()) << std::endl;;
+		for (double height : heights) {
+			auto tr = Transform3d::Identity();
+			Vec3d offset = mi->get_offset();
+			tr.translate(Vec3d(-offset.x(), -offset.y(), 0.));
+			Polygon pgn = its_convex_hull_2d_above(mo->mesh().its, tr.cast<float>(), height);
+			out << "POLYGON_AT_HEIGHT" << scaled(height) << std::endl;
+			for (const Point& pt : pgn)
+				out << "POINT" << pt.x() << " " << pt.y() << std::endl;
+		}
+	}
+}
+
+
+
+
+void import_arrange_data(Model& model, bool delete_files)
+{
+	// First go through all files in the current directory
+	// and remember all which match the pattern.
+	namespace fs = boost::filesystem;
+	fs::path p(".");
+    fs::directory_iterator end_itr;
+	std::vector<std::string> filenames;
+    for (fs::directory_iterator itr(p); itr != end_itr; ++itr)
+    {
+        if (fs::is_regular_file(itr->path())) {
+			std::string name = itr->path().filename().string();
+            if (boost::starts_with(name, "arrange_data_import") && boost::ends_with(name, ".txt"))
+				filenames.emplace_back(name);
+        }
+    }
+	// Sort the files alphabetically.
+	std::sort(filenames.begin(), filenames.end());
+
+
+	struct MoveData {
+		size_t id;
+		coord_t x;
+		coord_t y;
+		size_t bed_idx;
+	};
+
+	// A vector to collect move data for all the files.
+	std::vector<MoveData> move_data_all;
+
+
+	// Now iterate through all the files, read the data and move the objects accordingly.
+	// Save the move data from this file to move_data_all.
+	size_t bed_idx = 0;
+	for (const std::string& name : filenames) {
+		std::cout << " - loading file " << name << "..." << std::endl;
+		std::ifstream in(name);
+
+		std::string line;		
+		std::vector<MoveData> move_data;
+		while (in) {
+			std::getline(in, line);
+			std::vector<std::string> values;
+			boost::split(values, line, boost::is_any_of(" "));
+			if (values.size() > 2)
+				move_data.emplace_back(MoveData{size_t(std::stoi(values[0])), std::stoi(values[1]), std::stoi(values[2]), bed_idx});
+		}
+
+		// Iterate the same way as when exporting.
+		for (ModelObject* mo : model.objects) {
+			ModelInstance* mi = mo->instances.front();
+			const ObjectID& oid = mo->id();
+			auto it = std::find_if(move_data.begin(), move_data.end(), [&oid](const auto& md) { return md.id == oid.id; });
+			if (it != move_data.end()) {
+				mi->set_offset(Vec3d(unscaled(it->x) + bed_idx * 300, unscaled(it->y), mi->get_offset().z()));
+			}
+		}
+		move_data_all.insert(move_data_all.end(), move_data.begin(), move_data.end());
+		++bed_idx;
+	}
+
+	if (delete_files) {
+		std::cout << " - removing all the files...";
+		for (const std::string& name : filenames)
+			fs::remove(fs::path(name));
+		std::cout << "done" << std::endl;
+	}
+
+	// Now reorder the objects in the model so they are in the same order as requested.
+	auto comp = [&move_data_all](ModelObject* mo1, ModelObject* mo2) {
+		auto it1 = std::find_if(move_data_all.begin(), move_data_all.end(), [&mo1](const auto& md) { return md.id == mo1->id().id; });
+		auto it2 = std::find_if(move_data_all.begin(), move_data_all.end(), [&mo2](const auto& md) { return md.id == mo2->id().id; });
+		return it1->bed_idx == it2->bed_idx ? it1 < it2 : it1->bed_idx < it2->bed_idx;
+	};
+	std::sort(model.objects.begin(), model.objects.end(), comp);
+}
+
+
+
+void export_run_and_import_arrange_data(Model& model, const std::string& cmd, bool delete_files)
+{
+	std::cout << "Reading height from printer_geometry.mk4.txt" << std::endl;
+	std::vector<double> heights = read_required_heights();
+	if (heights.empty()) {
+	    std::cout << "unable" << std::endl;
+		return;
+	}
+
+	std::cout << "Exporting the arrange data...";
+	export_arrange_data(model, heights);
+	std::cout << "done" << std::endl;
+
+	std::cout << "Running " << cmd << std::endl;
+	int out = wxExecute(wxString::FromUTF8(cmd), wxEXEC_SYNC);
+	if (out == -1) {
+	    std::cout << "unable" << std::endl;
+		return;
+	}
+	std::cout << "sequential_prusa returned " << out << (out == 0 ? ": ok" : ": appears to be an error") << std::endl;
+
+	if (out ==0 ) {
+		std::cout << "Importing the arrange data..." << std::endl;
+		import_arrange_data(model, delete_files);
+		std::cout << "Import done" << std::endl;
+	}
+}
+
+
+
+
+}
diff --git a/src/slic3r/GUI/ArrangeHelper.hpp b/src/slic3r/GUI/ArrangeHelper.hpp
new file mode 100644
index 0000000000..63cc351e56
--- /dev/null
+++ b/src/slic3r/GUI/ArrangeHelper.hpp
@@ -0,0 +1,12 @@
+#ifndef slic3r_Arrange_Helper_hpp
+#define slic3r_Arrange_Helper_hpp
+
+class Model;
+
+namespace Slic3r {
+	void export_run_and_import_arrange_data(Model&, const std::string&, bool);
+	void export_arrange_data(const Model& model, const std::vector<double>& heights);
+	void import_arrange_data(Model& model, bool delete_files);
+}
+
+#endif // slic3r_Arrange_Helper_hpp
\ No newline at end of file
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 51d6de463e..4eda5dca27 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -44,6 +44,7 @@
 #include "I18N.hpp"
 #include "NotificationManager.hpp"
 #include "format.hpp"
+#include "ArrangeHelper.hpp"
 
 #include "slic3r/GUI/BitmapCache.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp"
@@ -2217,7 +2218,49 @@ void GLCanvas3D::render()
 #endif // SHOW_IMGUI_DEMO_WINDOW
 
 
-    
+
+
+    {
+        // This is just temporary pipe to export data to the separate arrange algorithm
+        // and importing the result back. TESTING ONLY !!!
+        ImGui::Begin("TESTING ONLY (arrange)");
+        static bool decimation = true;
+        static bool precision_high = false;
+        static bool assumptions = false;
+        static int  object_group_size = 4;
+        static bool delete_files = true;
+        static std::string printer_file = "printer_geometry.mk4.txt";
+        ImGui::Checkbox("Decimation", &decimation);
+        ImGui::Checkbox("Precision", &precision_high);
+        ImGui::Checkbox("Assumptions", &assumptions);
+        ImGui::InputInt("Group size", &object_group_size);
+        wxGetApp().imgui()->disabled_begin(true);
+        ImGui::InputText("Printer file", printer_file.data(), printer_file.size());
+        wxGetApp().imgui()->disabled_end();
+        ImGui::Separator();
+        ImGui::Checkbox("Delete files after use", &delete_files);
+
+        std::stringstream ss;
+        ss << "./sequential_prusa"
+           << " --decimation=" << (decimation ? "yes" : "no")
+           << " --precision="  << (precision_high ? "high" : "low")
+           << " --assumptions=" << (assumptions ? "yes" : "no")
+           << " --object-group-size=" << object_group_size
+            << " --printer-file=" << printer_file
+           << " --interactive=no";
+        ImGui::Text((std::string("Command: '") + ss.str() + "'").c_str());
+
+
+        if (ImGui::Button("Do external arrange")) {
+            export_run_and_import_arrange_data(wxGetApp().plater()->model(), ss.str(), delete_files);
+            reload_scene(true, true);
+            wxGetApp().obj_list()->update_after_undo_redo();
+        }
+        ImGui::End();
+    }
+
+
+
 
 
     const bool is_looking_downward = camera.is_looking_downward();