Check if object's size appears to be zero, when loading the model file.

src/libslic3r/Model.cpp

@@ -513,6 +513,22 @@ void Model::convert_from_meters(bool only_small_volumes)
         }
 }
 
+static constexpr const double zero_volume = 0.0000000001;
+
+int Model::removed_objects_with_zero_volume()
+{
+    if (objects.size() == 0)
+        return 0;
+
+    int removed = 0;
+    for (int i = int(objects.size()) - 1; i >= 0; i--)
+        if (objects[i]->get_object_stl_stats().volume < zero_volume) {
+            delete_object(size_t(i));
+            removed++;
+        }
+    return removed;
+}
+
 void Model::adjust_min_z()
 {
     if (objects.empty())

src/libslic3r/Model.hpp

@@ -1124,6 +1124,7 @@ public:
     void          convert_from_imperial_units(bool only_small_volumes);
     bool          looks_like_saved_in_meters() const;
     void          convert_from_meters(bool only_small_volumes);
+    int           removed_objects_with_zero_volume();
 
     // Ensures that the min z of the model is not negative
     void 		  adjust_min_z();

src/slic3r/GUI/Plater.cpp

@@ -2438,6 +2438,14 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
             };
 
             if (!is_project_file) {
+                if (int deleted_objects = model.removed_objects_with_zero_volume(); deleted_objects > 0) {
+                    MessageDialog(q, format_wxstr(_L_PLURAL(
+                        "Object size from file %s appears to be zero.\n"
+                        "This object has been removed from the model",
+                        "Objects size from file %s appear to be zero.\n"
+                        "These objects have been removed from the model", deleted_objects), from_path(filename)) + "\n",
+                        _L("Object size is zero"), wxICON_INFORMATION | wxOK).ShowModal();
+                }
                 if (imperial_units)
                     // Convert even if the object is big.
                     convert_from_imperial_units(model, false);