diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index e15b8c34c..f5ef10e9c 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -53,7 +53,7 @@ sub new {
         bed_shape complete_objects extruder_clearance_radius skirts skirt_distance brim_width variable_layer_height
         serial_port serial_speed octoprint_host octoprint_apikey octoprint_cafile
         nozzle_diameter single_extruder_multi_material wipe_tower wipe_tower_x wipe_tower_y wipe_tower_width
-	wipe_tower_rotation_angle extruder_colour filament_colour max_print_height
+	wipe_tower_rotation_angle extruder_colour filament_colour max_print_height printer_model
     )]);
     # C++ Slic3r::Model with Perl extensions in Slic3r/Model.pm
     $self->{model} = Slic3r::Model->new;
@@ -1886,6 +1886,9 @@ sub on_config_change {
             $self->{preview3D}->set_number_extruders(scalar(@{$extruder_colors}));
         } elsif ($opt_key eq 'max_print_height') {
             $update_scheduled = 1;
+        } elsif ($opt_key eq 'printer_model') {
+            # update to force bed selection (for texturing)
+            $update_scheduled = 1;
         }
     }
 
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index f9c10017e..d3153bdb4 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -405,16 +405,27 @@ GLCanvas3D::Bed::EType GLCanvas3D::Bed::_detect_type() const
     const PresetBundle* bundle = get_preset_bundle();
     if (bundle != nullptr)
     {
-        const Preset& curr = bundle->printers.get_selected_preset();
-        if (curr.config.has("bed_shape") && _are_equal(m_shape, dynamic_cast<const ConfigOptionPoints*>(curr.config.option("bed_shape"))->values))
+        const Preset* curr = &bundle->printers.get_selected_preset();
+        while (curr != nullptr)
         {
-            if ((curr.vendor != nullptr) && (curr.vendor->name == "Prusa Research"))
+            if (curr->config.has("bed_shape") && _are_equal(m_shape, dynamic_cast<const ConfigOptionPoints*>(curr->config.option("bed_shape"))->values))
             {
-                if (boost::contains(curr.name, "MK2"))
-                    type = MK2;
-                else if (boost::contains(curr.name, "MK3"))
-                    type = MK3;
+                if ((curr->vendor != nullptr) && (curr->vendor->name == "Prusa Research"))
+                {
+                    if (boost::contains(curr->name, "MK2"))
+                    {
+                        type = MK2;
+                        break;
+                    }
+                    else if (boost::contains(curr->name, "MK3"))
+                    {
+                        type = MK3;
+                        break;
+                    }
+                }
             }
+
+            curr = bundle->printers.get_preset_parent(*curr);
         }
     }
 
diff --git a/xs/src/slic3r/GUI/GLTexture.cpp b/xs/src/slic3r/GUI/GLTexture.cpp
index 593362e54..924920bd8 100644
--- a/xs/src/slic3r/GUI/GLTexture.cpp
+++ b/xs/src/slic3r/GUI/GLTexture.cpp
@@ -4,6 +4,8 @@
 
 #include <wx/image.h>
 
+#include <boost/filesystem.hpp>
+
 #include <vector>
 #include <algorithm>
 
@@ -27,6 +29,9 @@ bool GLTexture::load_from_file(const std::string& filename, bool generate_mipmap
 {
     reset();
 
+    if (!boost::filesystem::exists(filename))
+        return false;
+
     // Load a PNG with an alpha channel.
     wxImage image;
     if (!image.LoadFile(filename, wxBITMAP_TYPE_PNG))
diff --git a/xs/src/slic3r/GUI/MsgDialog.hpp b/xs/src/slic3r/GUI/MsgDialog.hpp
index 2d570a0bf..ca349eb5c 100644
--- a/xs/src/slic3r/GUI/MsgDialog.hpp
+++ b/xs/src/slic3r/GUI/MsgDialog.hpp
@@ -28,6 +28,8 @@ struct MsgDialog : wxDialog
 	MsgDialog &operator=(const MsgDialog &) = delete;
 	virtual ~MsgDialog();
 
+	// TODO: refactor with CreateStdDialogButtonSizer usage
+
 protected:
 	enum {
 		CONTENT_WIDTH = 500,
diff --git a/xs/src/slic3r/Utils/Http.cpp b/xs/src/slic3r/Utils/Http.cpp
index 0826284d8..7c4126633 100644
--- a/xs/src/slic3r/Utils/Http.cpp
+++ b/xs/src/slic3r/Utils/Http.cpp
@@ -3,13 +3,16 @@
 #include <cstdlib>
 #include <functional>
 #include <thread>
-#include <tuple>
+#include <deque>
+#include <boost/filesystem/fstream.hpp>
 #include <boost/format.hpp>
 
 #include <curl/curl.h>
 
 #include "../../libslic3r/libslic3r.h"
 
+namespace fs = boost::filesystem;
+
 
 namespace Slic3r {
 
@@ -34,7 +37,11 @@ struct Http::priv
 	::curl_httppost *form;
 	::curl_httppost *form_end;
 	::curl_slist *headerlist;
+	// Used for reading the body
 	std::string buffer;
+	// Used for storing file streams added as multipart form parts
+	// Using a deque here because unlike vector it doesn't ivalidate pointers on insertion
+	std::deque<std::ifstream> form_files;
 	size_t limit;
 	bool cancel;
 
@@ -50,6 +57,10 @@ struct Http::priv
 	static size_t writecb(void *data, size_t size, size_t nmemb, void *userp);
 	static int xfercb(void *userp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow);
 	static int xfercb_legacy(void *userp, double dltotal, double dlnow, double ultotal, double ulnow);
+	static size_t form_file_read_cb(char *buffer, size_t size, size_t nitems, void *userp);
+
+	void form_add_file(const char *name, const fs::path &path, const char* filename);
+
 	std::string curl_error(CURLcode curlcode);
 	std::string body_size_error();
 	void http_perform();
@@ -135,6 +146,47 @@ int Http::priv::xfercb_legacy(void *userp, double dltotal, double dlnow, double
 	return xfercb(userp, dltotal, dlnow, ultotal, ulnow);
 }
 
+size_t Http::priv::form_file_read_cb(char *buffer, size_t size, size_t nitems, void *userp)
+{
+	auto stream = reinterpret_cast<fs::ifstream*>(userp);
+
+	try {
+		stream->read(buffer, size * nitems);
+	} catch (...) {
+		return CURL_READFUNC_ABORT;
+	}
+
+	return stream->gcount();
+}
+
+void Http::priv::form_add_file(const char *name, const fs::path &path, const char* filename)
+{
+	// We can't use CURLFORM_FILECONTENT, because curl doesn't support Unicode filenames on Windows
+	// and so we use CURLFORM_STREAM with boost ifstream to read the file.
+
+	if (filename == nullptr) {
+		filename = path.string().c_str();
+	}
+
+	fs::ifstream stream(path, std::ios::in | std::ios::binary);
+	stream.seekg(0, std::ios::end);
+	size_t size = stream.tellg();
+	stream.seekg(0);
+	form_files.push_back(std::move(stream));
+	auto stream_ptr = &form_files.back();
+
+	if (filename != nullptr) {
+		::curl_formadd(&form, &form_end,
+			CURLFORM_COPYNAME, name,
+			CURLFORM_FILENAME, filename,
+			CURLFORM_CONTENTTYPE, "application/octet-stream",
+			CURLFORM_STREAM, static_cast<void*>(stream_ptr),
+			CURLFORM_CONTENTSLENGTH, static_cast<long>(size),
+			CURLFORM_END
+		);
+	}
+}
+
 std::string Http::priv::curl_error(CURLcode curlcode)
 {
 	return (boost::format("%1% (%2%)")
@@ -154,6 +206,7 @@ void Http::priv::http_perform()
 	::curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
 	::curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writecb);
 	::curl_easy_setopt(curl, CURLOPT_WRITEDATA, static_cast<void*>(this));
+	::curl_easy_setopt(curl, CURLOPT_READFUNCTION, form_file_read_cb);
 
 	::curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
 #if LIBCURL_VERSION_MAJOR >= 7 && LIBCURL_VERSION_MINOR >= 32
@@ -183,14 +236,20 @@ void Http::priv::http_perform()
 
 	if (res != CURLE_OK) {
 		if (res == CURLE_ABORTED_BY_CALLBACK) {
-			Progress dummyprogress(0, 0, 0, 0);
-			bool cancel = true;
-			if (progressfn) { progressfn(dummyprogress, cancel); }
+			if (cancel) {
+				// The abort comes from the request being cancelled programatically
+				Progress dummyprogress(0, 0, 0, 0);
+				bool cancel = true;
+				if (progressfn) { progressfn(dummyprogress, cancel); }
+			} else {
+				// The abort comes from the CURLOPT_READFUNCTION callback, which means reading file failed
+				if (errorfn) { errorfn(std::move(buffer), "Error reading file for file upload", http_status); }
+			}
 		}
 		else if (res == CURLE_WRITE_ERROR) {
-			if (errorfn) { errorfn(std::move(buffer), std::move(body_size_error()), http_status); }
+			if (errorfn) { errorfn(std::move(buffer), body_size_error(), http_status); }
 		} else {
-			if (errorfn) { errorfn(std::move(buffer), std::move(curl_error(res)), http_status); }
+			if (errorfn) { errorfn(std::move(buffer), curl_error(res), http_status); }
 		};
 	} else {
 		if (completefn) {
@@ -265,17 +324,15 @@ Http& Http::form_add(const std::string &name, const std::string &contents)
 	return *this;
 }
 
-Http& Http::form_add_file(const std::string &name, const std::string &filename)
+Http& Http::form_add_file(const std::string &name, const fs::path &path)
 {
-	if (p) {
-		::curl_formadd(&p->form, &p->form_end,
-			CURLFORM_COPYNAME, name.c_str(),
-			CURLFORM_FILE, filename.c_str(),
-			CURLFORM_CONTENTTYPE, "application/octet-stream",
-			CURLFORM_END
-		);
-	}
+	if (p) { p->form_add_file(name.c_str(), path.c_str(), nullptr); }
+	return *this;
+}
 
+Http& Http::form_add_file(const std::string &name, const fs::path &path, const std::string &filename)
+{
+	if (p) { p->form_add_file(name.c_str(), path.c_str(), filename.c_str()); }
 	return *this;
 }
 
diff --git a/xs/src/slic3r/Utils/Http.hpp b/xs/src/slic3r/Utils/Http.hpp
index 7ed8196e6..73656bf88 100644
--- a/xs/src/slic3r/Utils/Http.hpp
+++ b/xs/src/slic3r/Utils/Http.hpp
@@ -4,6 +4,7 @@
 #include <memory>
 #include <string>
 #include <functional>
+#include <boost/filesystem/path.hpp>
 
 
 namespace Slic3r {
@@ -16,11 +17,11 @@ private:
 public:
 	struct Progress
 	{
-		size_t dltotal;
-		size_t dlnow;
-		size_t ultotal;
-		size_t ulnow;
-		
+		size_t dltotal;   // Total bytes to download
+		size_t dlnow;     // Bytes downloaded so far
+		size_t ultotal;   // Total bytes to upload
+		size_t ulnow;     // Bytes uploaded so far
+
 		Progress(size_t dltotal, size_t dlnow, size_t ultotal, size_t ulnow) :
 			dltotal(dltotal), dlnow(dlnow), ultotal(ultotal), ulnow(ulnow)
 		{}
@@ -33,6 +34,10 @@ public:
 
 	Http(Http &&other);
 
+	// Note: strings are expected to be UTF-8-encoded
+
+	// These are the primary constructors that create a HTTP object
+	// for a GET and a POST request respectively.
 	static Http get(std::string url);
 	static Http post(std::string url);
 	~Http();
@@ -41,21 +46,42 @@ public:
 	Http& operator=(const Http &) = delete;
 	Http& operator=(Http &&) = delete;
 
+	// Sets a maximum size of the data that can be received. The default is 5MB.
 	Http& size_limit(size_t sizeLimit);
+	// Sets a HTTP header field.
 	Http& header(std::string name, const std::string &value);
+	// Removes a header field.
 	Http& remove_header(std::string name);
+	// Sets a CA certificate file for usage with HTTPS. This is only supported on some backends,
+	// specifically, this is supported with OpenSSL and NOT supported with Windows and OS X native certificate store.
+	// See also ca_file_supported().
 	Http& ca_file(const std::string &filename);
+	// Add a HTTP multipart form field
 	Http& form_add(const std::string &name, const std::string &contents);
-	Http& form_add_file(const std::string &name, const std::string &filename);
+	// Add a HTTP multipart form file data contents, `name` is the name of the part
+	Http& form_add_file(const std::string &name, const boost::filesystem::path &path);
+	// Same as above except also override the file's filename with a custom one
+	Http& form_add_file(const std::string &name, const boost::filesystem::path &path, const std::string &filename);
 
+	// Callback called on HTTP request complete
 	Http& on_complete(CompleteFn fn);
+	// Callback called on an error occuring at any stage of the requests: Url parsing, DNS lookup,
+	// TCP connection, HTTP transfer, and finally also when the response indicates an error (status >= 400).
+	// Therefore, a response body may or may not be present.
 	Http& on_error(ErrorFn fn);
+	// Callback called on data download/upload prorgess (called fairly frequently).
+	// See the `Progress` structure for description of the data passed.
+	// Writing a true-ish value into the cancel reference parameter cancels the request.
 	Http& on_progress(ProgressFn fn);
 
+	// Starts performing the request in a background thread
 	Ptr perform();
+	// Starts performing the request on the current thread
 	void perform_sync();
+	// Cancels a request in progress
 	void cancel();
 
+	// Tells whether current backend supports seting up a CA file using ca_file()
 	static bool ca_file_supported();
 private:
 	Http(const std::string &url);
diff --git a/xs/src/slic3r/Utils/OctoPrint.cpp b/xs/src/slic3r/Utils/OctoPrint.cpp
index e63a16c38..86049de16 100644
--- a/xs/src/slic3r/Utils/OctoPrint.cpp
+++ b/xs/src/slic3r/Utils/OctoPrint.cpp
@@ -1,20 +1,65 @@
 #include "OctoPrint.hpp"
 
 #include <algorithm>
+#include <boost/filesystem/path.hpp>
 #include <boost/format.hpp>
+#include <boost/log/trivial.hpp>
 
 #include <wx/frame.h>
 #include <wx/event.h>
 #include <wx/progdlg.h>
+#include <wx/sizer.h>
+#include <wx/stattext.h>
+#include <wx/textctrl.h>
+#include <wx/checkbox.h>
 
 #include "libslic3r/PrintConfig.hpp"
 #include "slic3r/GUI/GUI.hpp"
+#include "slic3r/GUI/MsgDialog.hpp"
 #include "Http.hpp"
 
+namespace fs = boost::filesystem;
+
 
 namespace Slic3r {
 
 
+struct SendDialog : public GUI::MsgDialog
+{
+	wxTextCtrl *txt_filename;
+	wxCheckBox *box_print;
+
+	SendDialog(const fs::path &path) :
+		MsgDialog(nullptr, _(L("Send G-Code to printer")), _(L("Upload to OctoPrint with the following filename:")), wxID_NONE),
+		txt_filename(new wxTextCtrl(this, wxID_ANY, path.filename().wstring())),
+		box_print(new wxCheckBox(this, wxID_ANY, _(L("Start printing after upload"))))
+	{
+		auto *label_dir_hint = new wxStaticText(this, wxID_ANY, _(L("Use forward slashes ( / ) as a directory separator if needed.")));
+		label_dir_hint->Wrap(CONTENT_WIDTH);
+
+		content_sizer->Add(txt_filename, 0, wxEXPAND);
+		content_sizer->Add(label_dir_hint);
+		content_sizer->AddSpacer(VERT_SPACING);
+		content_sizer->Add(box_print, 0, wxBOTTOM, 2*VERT_SPACING);
+
+		btn_sizer->Add(CreateStdDialogButtonSizer(wxOK | wxCANCEL));
+
+		txt_filename->SetFocus();
+		wxString stem(path.stem().wstring());
+		txt_filename->SetSelection(0, stem.Length());
+
+		Fit();
+	}
+
+	fs::path filename() const {
+		return fs::path(txt_filename->GetValue().wx_str());
+	}
+
+	bool print() const { return box_print->GetValue(); }
+};
+
+
+
 OctoPrint::OctoPrint(DynamicPrintConfig *config) :
 	host(config->opt_string("octoprint_host")),
 	apikey(config->opt_string("octoprint_apikey")),
@@ -27,24 +72,39 @@ bool OctoPrint::test(wxString &msg) const
 	// it is ok to refer to `msg` from within the closure
 
 	bool res = true;
+	auto url = make_url("api/version");
+
+	BOOST_LOG_TRIVIAL(info) << boost::format("Octoprint: Get version at: %1%") % url;
 
-	auto url = std::move(make_url("api/version"));
 	auto http = Http::get(std::move(url));
 	set_auth(http);
 	http.on_error([&](std::string, std::string error, unsigned status) {
+			BOOST_LOG_TRIVIAL(error) << boost::format("Octoprint: Error getting version: %1% (HTTP %2%)") % error % status;
 			res = false;
 			msg = format_error(error, status);
 		})
+		.on_complete([&](std::string body, unsigned) {
+			BOOST_LOG_TRIVIAL(debug) << boost::format("Octoprint: Got version: %1%") % body;
+		})
 		.perform_sync();
 
 	return res;
 }
 
-bool OctoPrint::send_gcode(const std::string &filename, bool print) const
+bool OctoPrint::send_gcode(const std::string &filename) const
 {
 	enum { PROGRESS_RANGE = 1000 };
 
 	const auto errortitle = _(L("Error while uploading to the OctoPrint server"));
+	fs::path filepath(filename);
+
+	SendDialog send_dialog(filepath.filename());
+	if (send_dialog.ShowModal() != wxID_OK) { return false; }
+
+	const bool print = send_dialog.print();
+	const auto upload_filepath = send_dialog.filename();
+	const auto upload_filename = upload_filepath.filename();
+	const auto upload_parent_path = upload_filepath.parent_path();
 
 	wxProgressDialog progress_dialog(
 		_(L("OctoPrint upload")),
@@ -61,14 +121,26 @@ bool OctoPrint::send_gcode(const std::string &filename, bool print) const
 
 	bool res = true;
 
-	auto http = Http::post(std::move(make_url("api/files/local")));
+	auto url = make_url("api/files/local");
+
+	BOOST_LOG_TRIVIAL(info) << boost::format("Octoprint: Uploading file %1% at %2%, filename: %3%, path: %4%, print: %5%")
+		% filepath.string()
+		% url
+		% upload_filename.string()
+		% upload_parent_path.string()
+		% print;
+
+	auto http = Http::post(std::move(url));
 	set_auth(http);
 	http.form_add("print", print ? "true" : "false")
-		.form_add_file("file", filename)
+		.form_add("path", upload_parent_path.string())
+		.form_add_file("file", filename, upload_filename.string())
 		.on_complete([&](std::string body, unsigned status) {
+			BOOST_LOG_TRIVIAL(debug) << boost::format("Octoprint: File uploaded: HTTP %1%: %2%") % status % body;
 			progress_dialog.Update(PROGRESS_RANGE);
 		})
 		.on_error([&](std::string body, std::string error, unsigned status) {
+			BOOST_LOG_TRIVIAL(error) << boost::format("Octoprint: Error uploading file: %1% (HTTP %2%)") % error % status;
 			auto errormsg = wxString::Format("%s: %s", errortitle, format_error(error, status));
 			GUI::show_error(&progress_dialog, std::move(errormsg));
 			res = false;
@@ -102,24 +174,24 @@ std::string OctoPrint::make_url(const std::string &path) const
 {
 	if (host.find("http://") == 0 || host.find("https://") == 0) {
 		if (host.back() == '/') {
-			return std::move((boost::format("%1%%2%") % host % path).str());
+			return (boost::format("%1%%2%") % host % path).str();
 		} else {
-			return std::move((boost::format("%1%/%2%") % host % path).str());
+			return (boost::format("%1%/%2%") % host % path).str();
 		}
 	} else {
-		return std::move((boost::format("http://%1%/%2%") % host % path).str());
+		return (boost::format("http://%1%/%2%") % host % path).str();
 	}
 }
 
-wxString OctoPrint::format_error(std::string error, unsigned status)
+wxString OctoPrint::format_error(const std::string &error, unsigned status)
 {
-	const wxString wxerror = error;
+	auto wxerror = wxString::FromUTF8(error.data());
 
 	if (status != 0) {
 		return wxString::Format("HTTP %u: %s", status,
 			(status == 401 ? _(L("Invalid API key")) : wxerror));
 	} else {
-		return std::move(wxerror);
+		return wxerror;
 	}
 }
 
diff --git a/xs/src/slic3r/Utils/OctoPrint.hpp b/xs/src/slic3r/Utils/OctoPrint.hpp
index 744b4fcc1..a8599faa9 100644
--- a/xs/src/slic3r/Utils/OctoPrint.hpp
+++ b/xs/src/slic3r/Utils/OctoPrint.hpp
@@ -17,7 +17,8 @@ public:
 	OctoPrint(DynamicPrintConfig *config);
 
 	bool test(wxString &curl_msg) const;
-	bool send_gcode(const std::string &filename, bool print = false) const;
+	// Send gcode file to octoprint, filename is expected to be in UTF-8
+	bool send_gcode(const std::string &filename) const;
 private:
 	std::string host;
 	std::string apikey;
@@ -25,7 +26,7 @@ private:
 
 	void set_auth(Http &http) const;
 	std::string make_url(const std::string &path) const;
-	static wxString format_error(std::string error, unsigned status);
+	static wxString format_error(const std::string &error, unsigned status);
 };
 
 
diff --git a/xs/xsp/Utils_OctoPrint.xsp b/xs/xsp/Utils_OctoPrint.xsp
index 282a3055d..28610cb01 100644
--- a/xs/xsp/Utils_OctoPrint.xsp
+++ b/xs/xsp/Utils_OctoPrint.xsp
@@ -9,5 +9,5 @@
     OctoPrint(DynamicPrintConfig *config);
     ~OctoPrint();
 
-    bool send_gcode(std::string filename, bool print = false) const;
+    bool send_gcode(std::string filename) const;
 };