diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index f8e7b1f94..7d58f3c09 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1651,12 +1651,12 @@ void GLCanvas3D::render()
 }
 
 #if ENABLE_THUMBNAIL_GENERATOR
-void GLCanvas3D::render_thumbnail(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only)
+void GLCanvas3D::render_thumbnail(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
 {
     if (GLCanvas3DManager::are_framebuffers_supported())
-        _render_thumbnail_framebuffer(thumbnail_data, w, h, printable_only, parts_only);
+        _render_thumbnail_framebuffer(thumbnail_data, w, h, printable_only, parts_only, transparent_background);
     else
-        _render_thumbnail_legacy(thumbnail_data, w, h, printable_only, parts_only);
+        _render_thumbnail_legacy(thumbnail_data, w, h, printable_only, parts_only, transparent_background);
 }
 #endif // ENABLE_THUMBNAIL_GENERATOR
 
@@ -3595,7 +3595,7 @@ static void debug_output_thumbnail(const ThumbnailData& thumbnail_data)
 #endif // ENABLE_THUMBNAIL_GENERATOR_DEBUG_OUTPUT
 
 
-static void render_volumes_in_thumbnail(Shader& shader, const GLVolumePtrs& volumes, ThumbnailData& thumbnail_data, bool printable_only, bool parts_only)
+static void render_volumes_in_thumbnail(Shader& shader, const GLVolumePtrs& volumes, ThumbnailData& thumbnail_data, bool printable_only, bool parts_only, bool transparent_background)
 {
     auto is_visible = [](const GLVolume& v) -> bool
     {
@@ -3634,6 +3634,9 @@ static void render_volumes_in_thumbnail(Shader& shader, const GLVolumePtrs& volu
     camera.apply_view_matrix();
     camera.apply_projection(box);
 
+    if (transparent_background)
+        glsafe(::glClearColor(1.0f, 1.0f, 1.0f, 0.0f));
+
     glsafe(::glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
     glsafe(::glEnable(GL_DEPTH_TEST));
 
@@ -3660,9 +3663,12 @@ static void render_volumes_in_thumbnail(Shader& shader, const GLVolumePtrs& volu
     shader.stop_using();
 
     glsafe(::glDisable(GL_DEPTH_TEST));
+
+    if (transparent_background)
+        glsafe(::glClearColor(1.0f, 1.0f, 1.0f, 1.0f));
 }
 
-void GLCanvas3D::_render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only)
+void GLCanvas3D::_render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
 {
     thumbnail_data.set(w, h);
     if (!thumbnail_data.is_valid())
@@ -3715,7 +3721,7 @@ void GLCanvas3D::_render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, un
 
     if (::glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE)
     {
-        render_volumes_in_thumbnail(m_shader, m_volumes.volumes, thumbnail_data, printable_only, parts_only);
+        render_volumes_in_thumbnail(m_shader, m_volumes.volumes, thumbnail_data, printable_only, parts_only, transparent_background);
 
         if (multisample)
         {
@@ -3766,7 +3772,7 @@ void GLCanvas3D::_render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, un
         glsafe(::glDisable(GL_MULTISAMPLE));
 }
 
-void GLCanvas3D::_render_thumbnail_legacy(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only)
+void GLCanvas3D::_render_thumbnail_legacy(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
 {
     // check that thumbnail size does not exceed the default framebuffer size
     const Size& cnv_size = get_canvas_size();
@@ -3783,7 +3789,7 @@ void GLCanvas3D::_render_thumbnail_legacy(ThumbnailData& thumbnail_data, unsigne
     if (!thumbnail_data.is_valid())
         return;
 
-    render_volumes_in_thumbnail(m_shader, m_volumes.volumes, thumbnail_data, printable_only, parts_only);
+    render_volumes_in_thumbnail(m_shader, m_volumes.volumes, thumbnail_data, printable_only, parts_only, transparent_background);
 
     glsafe(::glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, (void*)thumbnail_data.pixels.data()));
 #if ENABLE_THUMBNAIL_GENERATOR_DEBUG_OUTPUT
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index 850e851fa..9f8d9d228 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -529,7 +529,7 @@ public:
 #if ENABLE_THUMBNAIL_GENERATOR
     // printable_only == false -> render also non printable volumes as grayed
     // parts_only == false -> render also sla support and pad
-    void render_thumbnail(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only);
+    void render_thumbnail(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background);
 #endif // ENABLE_THUMBNAIL_GENERATOR
 
     void select_all();
@@ -684,9 +684,9 @@ private:
     void _render_undo_redo_stack(const bool is_undo, float pos_x);
 #if ENABLE_THUMBNAIL_GENERATOR
     // render thumbnail using an off-screen framebuffer
-    void _render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only);
-    // render thumbnail using the default framebuffer
-    void _render_thumbnail_legacy(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only);
+    void _render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background);
+        // render thumbnail using the default framebuffer
+    void _render_thumbnail_legacy(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background);
 #endif // ENABLE_THUMBNAIL_GENERATOR
 
     void _update_volumes_hover_state() const;
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 464093712..939af1652 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -1928,7 +1928,7 @@ struct Plater::priv
     bool can_reload_from_disk() const;
 
 #if ENABLE_THUMBNAIL_GENERATOR
-    void generate_thumbnail(ThumbnailData& data, unsigned int w, unsigned int h, bool printable_only, bool parts_only);
+    void generate_thumbnail(ThumbnailData& data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background);
 #endif // ENABLE_THUMBNAIL_GENERATOR
 
     void msw_rescale_object_menu();
@@ -3057,7 +3057,7 @@ bool Plater::priv::restart_background_process(unsigned int state)
                 for (const std::pair<unsigned int, unsigned int>& size : THUMBNAIL_SIZE_FFF)
                 {
                     this->thumbnail_data.push_back(ThumbnailData());
-                    generate_thumbnail(this->thumbnail_data.back(), size.first, size.second, true, true);
+                    generate_thumbnail(this->thumbnail_data.back(), size.first, size.second, true, true, false);
                 }
             }
             else if (this->printer_technology == ptSLA)
@@ -3068,7 +3068,7 @@ bool Plater::priv::restart_background_process(unsigned int state)
                 for (const std::pair<unsigned int, unsigned int>& size : THUMBNAIL_SIZE_SLA)
                 {
                     this->thumbnail_data.push_back(ThumbnailData());
-                    generate_thumbnail(this->thumbnail_data.back(), size.first, size.second, true, true);
+                    generate_thumbnail(this->thumbnail_data.back(), size.first, size.second, true, true, false);
                 }
             }
         }
@@ -3422,7 +3422,7 @@ void Plater::priv::on_slicing_update(SlicingStatusEvent &evt)
             for (const std::pair<unsigned int, unsigned int>& size : THUMBNAIL_SIZE_SLA)
             {
                 this->thumbnail_data.push_back(ThumbnailData());
-                generate_thumbnail(this->thumbnail_data.back(), size.first, size.second, true, false);
+                generate_thumbnail(this->thumbnail_data.back(), size.first, size.second, true, false, false);
             }
         }
 #endif // ENABLE_THUMBNAIL_GENERATOR
@@ -3653,9 +3653,9 @@ bool Plater::priv::init_object_menu()
 }
 
 #if ENABLE_THUMBNAIL_GENERATOR
-void Plater::priv::generate_thumbnail(ThumbnailData& data, unsigned int w, unsigned int h, bool printable_only, bool parts_only)
+void Plater::priv::generate_thumbnail(ThumbnailData& data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
 {
-    view3D->get_canvas3d()->render_thumbnail(data, w, h, printable_only, parts_only);
+    view3D->get_canvas3d()->render_thumbnail(data, w, h, printable_only, parts_only, transparent_background);
 }
 #endif // ENABLE_THUMBNAIL_GENERATOR
 
@@ -4699,7 +4699,7 @@ void Plater::export_3mf(const boost::filesystem::path& output_path)
     wxBusyCursor wait;
 #if ENABLE_THUMBNAIL_GENERATOR
     ThumbnailData thumbnail_data;
-    p->generate_thumbnail(thumbnail_data, THUMBNAIL_SIZE_3MF.first, THUMBNAIL_SIZE_3MF.second, false, true);
+    p->generate_thumbnail(thumbnail_data, THUMBNAIL_SIZE_3MF.first, THUMBNAIL_SIZE_3MF.second, false, true, true);
     if (Slic3r::store_3mf(path_u8.c_str(), &p->model, export_config ? &cfg : nullptr, &thumbnail_data)) {
 #else
     if (Slic3r::store_3mf(path_u8.c_str(), &p->model, export_config ? &cfg : nullptr)) {