check if last path is on rem drive

src/slic3r/GUI/AppConfig.cpp

@@ -21,7 +21,6 @@
 
 #include <wx/string.h>
 #include "I18N.hpp"
-#include "RemovableDriveManager.hpp"
 
 namespace Slic3r {
 
@@ -358,10 +357,7 @@ void AppConfig::update_skein_dir(const std::string &dir)
 
 std::string AppConfig::get_last_output_dir(const std::string &alt) const
 {
-	if (GUI::RemovableDriveManager::getInstance().update())
-	{
-		return GUI::RemovableDriveManager::getInstance().get_last_drive_path();
-	}
+	
     const auto it = m_storage.find("");
     if (it != m_storage.end()) {
         const auto it2 = it->second.find("last_output_path");

src/slic3r/GUI/Plater.cpp

@@ -77,6 +77,7 @@
 #include "../Utils/FixModelByWin10.hpp"
 #include "../Utils/UndoRedo.hpp"
 #include "../Utils/Thread.hpp"
+#include "RemovableDriveManager.hpp"
 
 #include <wx/glcanvas.h>    // Needs to be last because reasons :-/
 #include "WipeTowerDialog.hpp"
@@ -4549,7 +4550,13 @@ void Plater::export_gcode()
     }
     default_output_file = fs::path(Slic3r::fold_utf8_to_ascii(default_output_file.string()));
     auto start_dir = wxGetApp().app_config->get_last_output_dir(default_output_file.parent_path().string());
-
+	if (GUI::RemovableDriveManager::getInstance().update())
+	{
+		if (!RemovableDriveManager::getInstance().is_path_on_removable_drive(start_dir))
+		{
+			start_dir = RemovableDriveManager::getInstance().get_last_drive_path();
+		}
+	}
     wxFileDialog dlg(this, (printer_technology() == ptFFF) ? _(L("Save G-code file as:")) : _(L("Save SL1 file as:")),
         start_dir,
         from_path(default_output_file.filename()),

src/slic3r/GUI/RemovableDriveManager.cpp

@@ -7,6 +7,7 @@
 #include <windows.h>
 #include <tchar.h>
 #include <winioctl.h>
+#include <shlwapi.h>
 DEFINE_GUID(GUID_DEVINTERFACE_USB_DEVICE,
 	0xA5DCBF10L, 0x6530, 0x11D2, 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED);
 #else
@@ -208,7 +209,11 @@ std::string RemovableDriveManager::get_last_drive_path()
 {
 	if (!m_current_drives.empty())
 	{
+#if _WIN32
+		return m_current_drives.back().path + "\\";
+#else
 		return m_current_drives.back().path;
+#endif	
 	}
 	return "";
 }
@@ -216,4 +221,27 @@ std::vector<DriveData> RemovableDriveManager::get_all_drives()
 {
 	return m_current_drives;
 }
-}}
+#if _WIN32
+bool RemovableDriveManager::is_path_on_removable_drive(const std::string& path)
+{
+	if (m_current_drives.empty())
+		return false;
+	int letter = PathGetDriveNumberA(path.c_str());
+	for (auto it = m_current_drives.begin(); it != m_current_drives.end(); ++it)
+	{
+		char drive = (*it).path[0];
+		if (drive == ('A' + letter))
+			return true;
+	}
+	return false;
+}
+#else
+bool RemovableDriveManager::is_path_on_removable_drive(const std::string& path, const std::string& drive)
+{
+	if (m_current_drives.empty())
+		return false;
+
+	return false;
+}
+#endif
+}}//namespace Slicer::Gui::

src/slic3r/GUI/RemovableDriveManager.hpp

@@ -29,6 +29,7 @@ public:
 	static void eject_drive(const std::string &path);
 	static std::string get_last_drive_path();
 	static std::vector<DriveData> get_all_drives();
+	static bool is_path_on_removable_drive(const std::string &path);
 private:
 	RemovableDriveManager(){}
 	static void search_for_drives();