diff --git a/resources/handy_models/3DBenchy.3mf b/resources/handy_models/3DBenchy.3mf
new file mode 100644
index 0000000000..61dcb1b329
Binary files /dev/null and b/resources/handy_models/3DBenchy.3mf differ
diff --git a/resources/handy_models/3DBenchy.stl b/resources/handy_models/3DBenchy.stl
deleted file mode 100644
index 5a51bb5f3f..0000000000
Binary files a/resources/handy_models/3DBenchy.stl and /dev/null differ
diff --git a/resources/handy_models/OrcaCube_v2.3mf b/resources/handy_models/OrcaCube_v2.3mf
index 14fba9eac0..ede7d884b9 100644
Binary files a/resources/handy_models/OrcaCube_v2.3mf and b/resources/handy_models/OrcaCube_v2.3mf differ
diff --git a/resources/handy_models/Orca_stringhell.3mf b/resources/handy_models/Orca_stringhell.3mf
new file mode 100644
index 0000000000..9221dde644
Binary files /dev/null and b/resources/handy_models/Orca_stringhell.3mf differ
diff --git a/resources/handy_models/Orca_stringhell.stl b/resources/handy_models/Orca_stringhell.stl
deleted file mode 100644
index f9a4d9823e..0000000000
Binary files a/resources/handy_models/Orca_stringhell.stl and /dev/null differ
diff --git a/resources/handy_models/Stanford_Bunny.3mf b/resources/handy_models/Stanford_Bunny.3mf
new file mode 100644
index 0000000000..f3f19d294c
Binary files /dev/null and b/resources/handy_models/Stanford_Bunny.3mf differ
diff --git a/resources/handy_models/Stanford_Bunny.stl b/resources/handy_models/Stanford_Bunny.stl
deleted file mode 100644
index fbbf2632f8..0000000000
Binary files a/resources/handy_models/Stanford_Bunny.stl and /dev/null differ
diff --git a/resources/handy_models/Voron_Design_Cube_v7.3mf b/resources/handy_models/Voron_Design_Cube_v7.3mf
new file mode 100644
index 0000000000..5b91187cbe
Binary files /dev/null and b/resources/handy_models/Voron_Design_Cube_v7.3mf differ
diff --git a/resources/handy_models/Voron_Design_Cube_v7.stl b/resources/handy_models/Voron_Design_Cube_v7.stl
deleted file mode 100644
index edb229b6df..0000000000
Binary files a/resources/handy_models/Voron_Design_Cube_v7.stl and /dev/null differ
diff --git a/resources/handy_models/ksr_fdmtest_v4.3mf b/resources/handy_models/ksr_fdmtest_v4.3mf
new file mode 100644
index 0000000000..11d6c74268
Binary files /dev/null and b/resources/handy_models/ksr_fdmtest_v4.3mf differ
diff --git a/resources/handy_models/ksr_fdmtest_v4.stl b/resources/handy_models/ksr_fdmtest_v4.stl
deleted file mode 100644
index 804727fd1c..0000000000
Binary files a/resources/handy_models/ksr_fdmtest_v4.stl and /dev/null differ
diff --git a/src/slic3r/GUI/GUI_Factories.cpp b/src/slic3r/GUI/GUI_Factories.cpp
index 20d9ea3a3b..ab513af845 100644
--- a/src/slic3r/GUI/GUI_Factories.cpp
+++ b/src/slic3r/GUI/GUI_Factories.cpp
@@ -544,15 +544,15 @@ wxMenu* MenuFactory::append_submenu_add_handy_model(wxMenu* menu, ModelVolumeTyp
                 if (file_name == L("Orca Cube"))
                     file_name = "OrcaCube_v2.3mf";
                 else if (file_name == L("3DBenchy"))
-                    file_name = "3DBenchy.stl";
+                    file_name = "3DBenchy.3mf";
                 else if (file_name == L("Autodesk FDM Test"))
-                    file_name = "ksr_fdmtest_v4.stl";
+                    file_name = "ksr_fdmtest_v4.3mf";
                 else if (file_name == L("Voron Cube"))
-                    file_name = "Voron_Design_Cube_v7.stl";
+                    file_name = "Voron_Design_Cube_v7.3mf";
                 else if (file_name == L("Stanford Bunny"))
-                    file_name = "Stanford_Bunny.stl";
+                    file_name = "Stanford_Bunny.3mf";
                 else if (file_name == L("Orca String Hell")) {
-                    file_name     = "Orca_stringhell.stl";
+                    file_name     = "Orca_stringhell.3mf";
                     is_stringhell = true;
                 } else
                     return;