diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index c8e402a5d..f99947293 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1945,7 +1945,7 @@ void GLCanvas3D::reload_scene(bool refresh_immediately, bool force_full_scene_re
 
     m_reload_delayed = !m_canvas->IsShown() && !refresh_immediately && !force_full_scene_refresh;
 
-    PrinterTechnology printer_technology = m_process->current_printer_technology();
+    PrinterTechnology printer_technology = current_printer_technology();
     int               volume_idx_wipe_tower_old = -1;
 
     // Release invalidated volumes to conserve GPU memory in case of delayed refresh (see m_reload_delayed).
@@ -3572,7 +3572,7 @@ void GLCanvas3D::do_move(const std::string& snapshot_type)
 #if ENABLE_ALLOW_NEGATIVE_Z
         double shift_z = m->get_instance_min_z(i.second);
 #if DISABLE_ALLOW_NEGATIVE_Z_FOR_SLA
-        if (m_process->current_printer_technology() == ptSLA || shift_z > 0.0) {
+        if (current_printer_technology() == ptSLA || shift_z > 0.0) {
 #else
         if (shift_z > 0.0) {
 #endif // DISABLE_ALLOW_NEGATIVE_Z_FOR_SLA
@@ -3919,7 +3919,7 @@ void GLCanvas3D::update_tooltip_for_settings_item_in_main_toolbar()
 {
     std::string new_tooltip = _u8L("Switch to Settings") + 
                              "\n" + "[" + GUI::shortkey_ctrl_prefix() + "2] - " + _u8L("Print Settings Tab")    + 
-                             "\n" + "[" + GUI::shortkey_ctrl_prefix() + "3] - " + (m_process->current_printer_technology() == ptFFF ? _u8L("Filament Settings Tab") : _u8L("Material Settings Tab")) +
+                             "\n" + "[" + GUI::shortkey_ctrl_prefix() + "3] - " + (current_printer_technology() == ptFFF ? _u8L("Filament Settings Tab") : _u8L("Material Settings Tab")) +
                              "\n" + "[" + GUI::shortkey_ctrl_prefix() + "4] - " + _u8L("Printer Settings Tab") ;
 
     m_main_toolbar.set_tooltip(get_main_toolbar_item_id("settings"), new_tooltip);
@@ -4073,7 +4073,7 @@ bool GLCanvas3D::_render_arrange_menu(float pos_x)
     ArrangeSettings &settings_out = get_arrange_settings();
 
     auto &appcfg = wxGetApp().app_config;
-    PrinterTechnology ptech = m_process->current_printer_technology();
+    PrinterTechnology ptech = current_printer_technology();
 
     bool settings_changed = false;
     float dist_min = 0.f;
@@ -4640,7 +4640,7 @@ bool GLCanvas3D::_init_main_toolbar()
     item.name = "settings";
     item.icon_filename = "settings.svg";
     item.tooltip = _u8L("Switch to Settings") + "\n" + "[" + GUI::shortkey_ctrl_prefix() + "2] - " + _u8L("Print Settings Tab")    + 
-                                                "\n" + "[" + GUI::shortkey_ctrl_prefix() + "3] - " + (m_process->current_printer_technology() == ptFFF ? _u8L("Filament Settings Tab") : _u8L("Material Settings Tab")) +
+                                                "\n" + "[" + GUI::shortkey_ctrl_prefix() + "3] - " + (current_printer_technology() == ptFFF ? _u8L("Filament Settings Tab") : _u8L("Material Settings Tab")) +
                                                 "\n" + "[" + GUI::shortkey_ctrl_prefix() + "4] - " + _u8L("Printer Settings Tab") ;
     item.sprite_id = 10;
     item.enabling_callback    = GLToolbarItem::Default_Enabling_Callback;
@@ -4682,7 +4682,7 @@ bool GLCanvas3D::_init_main_toolbar()
     item.sprite_id = 12;
     item.left.action_callback = [this]() { if (m_canvas != nullptr) wxPostEvent(m_canvas, SimpleEvent(EVT_GLTOOLBAR_LAYERSEDITING)); };
     item.visibility_callback = [this]()->bool {
-        bool res = m_process->current_printer_technology() == ptFFF;
+        bool res = current_printer_technology() == ptFFF;
         // turns off if changing printer technology
         if (!res && m_main_toolbar.is_item_visible("layersediting") && m_main_toolbar.is_item_pressed("layersediting"))
             force_main_toolbar_left_action(get_main_toolbar_item_id("layersediting"));
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index ab1d657e4..9f23de421 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -5796,6 +5796,14 @@ bool Plater::set_printer_technology(PrinterTechnology printer_technology)
     //FIXME for SLA synchronize
     //p->background_process.apply(Model)!
 
+#if DISABLE_ALLOW_NEGATIVE_Z_FOR_SLA
+    if (printer_technology == ptSLA) {
+        for (ModelObject* model_object : p->model.objects) {
+            model_object->ensure_on_bed();
+        }
+    }
+#endif // DISABLE_ALLOW_NEGATIVE_Z_FOR_SLA
+
     p->label_btn_export = printer_technology == ptFFF ? L("Export G-code") : L("Export");
     p->label_btn_send   = printer_technology == ptFFF ? L("Send G-code")   : L("Send to printer");