diff --git a/src/libslic3r/Format/3mf.cpp b/src/libslic3r/Format/3mf.cpp
index dde185fe5..49c336e62 100644
--- a/src/libslic3r/Format/3mf.cpp
+++ b/src/libslic3r/Format/3mf.cpp
@@ -1928,7 +1928,7 @@ namespace Slic3r {
                 else if (metadata.key == SOURCE_OFFSET_Z_KEY)
                     volume->source.mesh_offset(2) = ::atof(metadata.value.c_str());
                 else if (metadata.key == SOURCE_IN_INCHES)
-                    volume->source.is_converted_from_inches = metadata.value.c_str() == "1";
+                    volume->source.is_converted_from_inches = metadata.value == "1";
                 else
                     volume->config.set_deserialize(metadata.key, metadata.value);
             }
diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index d7682d276..7a1cdf8d3 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -461,11 +461,11 @@ bool Model::looks_like_imperial_units() const
     return false;
 }
 
-void Model::convert_from_imperial_units()
+void Model::convert_from_imperial_units(bool only_small_volumes)
 {
     double in_to_mm = 25.4;
     for (ModelObject* obj : this->objects)
-        if (obj->get_object_stl_stats().volume < 9.0) { // 9 = 3*3*3;
+        if (! only_small_volumes || obj->get_object_stl_stats().volume < 9.0) { // 9 = 3*3*3;
             obj->scale_mesh_after_creation(Vec3d(in_to_mm, in_to_mm, in_to_mm));
             for (ModelVolume* v : obj->volumes)
                 v->source.is_converted_from_inches = true;
@@ -1062,7 +1062,7 @@ void ModelObject::convert_units(ModelObjectPtrs& new_objects, bool from_imperial
 
             // Perform conversion only if the target "imperial" state is different from the current one.
             // This check supports conversion of "mixed" set of volumes, each with different "imperial" state.
-            if (vol->source.is_converted_from_inches != from_imperial && 
+            if (//vol->source.is_converted_from_inches != from_imperial && 
                 (volume_idxs.empty() || 
                  std::find(volume_idxs.begin(), volume_idxs.end(), vol_idx) != volume_idxs.end())) {
                 vol->scale_geometry_after_creation(versor);
diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index c10e304c3..99db132f6 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -1018,7 +1018,7 @@ public:
     bool 		  looks_like_multipart_object() const;
     void 		  convert_multipart_object(unsigned int max_extruders);
     bool          looks_like_imperial_units() const;
-    void          convert_from_imperial_units();
+    void          convert_from_imperial_units(bool only_small_volumes);
 
     // Ensures that the min z of the model is not negative
     void 		  adjust_min_z();
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 9129900d1..d46ea3567 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -2393,22 +2393,24 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
         {
             // The model should now be initialized
 
-            auto convert_from_imperial_units = [](Model& model) {
-                model.convert_from_imperial_units();
+            auto convert_from_imperial_units = [](Model& model, bool only_small_volumes) {
+                model.convert_from_imperial_units(only_small_volumes);
                 wxGetApp().app_config->set("use_inches", "1");
                 wxGetApp().sidebar().update_ui_from_settings();
             };
 
             if (!is_project_file) {
                 if (imperial_units)
-                    convert_from_imperial_units(model);
+                    // Convert even if the object is big.
+                    convert_from_imperial_units(model, false);
                 else if (model.looks_like_imperial_units()) {
                     wxMessageDialog msg_dlg(q, format_wxstr(_L(
                         "Some object(s) in file %s looks like saved in inches.\n"
                         "Should I consider them as a saved in inches and convert them?"), from_path(filename)) + "\n",
                         _L("The object appears to be saved in inches"), wxICON_WARNING | wxYES | wxNO);
                     if (msg_dlg.ShowModal() == wxID_YES)
-                        convert_from_imperial_units(model);
+                        //FIXME up-scale only the small parts?
+                        convert_from_imperial_units(model, true);
                 }
 
                 if (model.looks_like_multipart_object()) {