diff --git a/cura/Settings/GlobalStack.py b/cura/Settings/GlobalStack.py
index 9dfb8523b3..964551f263 100755
--- a/cura/Settings/GlobalStack.py
+++ b/cura/Settings/GlobalStack.py
@@ -107,6 +107,21 @@ class GlobalStack(CuraContainerStack):
     def setNextStack(self, next_stack: ContainerStack) -> None:
         raise Exceptions.InvalidOperationError("Global stack cannot have a next stack!")
 
+    ##  Gets the approximate filament diameter that the machine requires.
+    #
+    #   The approximate material diameter is the material diameter rounded to
+    #   the nearest millimetre.
+    #
+    #   If the machine has no requirement for the diameter, -1 is returned.
+    #
+    #   \return The approximate filament diameter for the printer, as a string.
+    @pyqtProperty(str)
+    def approximateMaterialDiameter(self) -> str:
+        material_diameter = self.definition.getMetaDataEntry("material_diameter")
+        if material_diameter is None:
+            return "-1"
+        return str(round(float(self.definition.getMetaDataEntry("material_diameter")))) #Round, then convert back to string.
+
     # protected:
 
     # Determine whether or not we should try to get the "resolve" property instead of the
diff --git a/tests/Settings/TestGlobalStack.py b/tests/Settings/TestGlobalStack.py
index 6dab02b220..3cac17fa3a 100755
--- a/tests/Settings/TestGlobalStack.py
+++ b/tests/Settings/TestGlobalStack.py
@@ -86,6 +86,28 @@ def test_addExtruder(global_stack):
     #         global_stack.addExtruder(unittest.mock.MagicMock())
     assert len(global_stack.extruders) == 2 #Didn't add the faulty extruder.
 
+##  Tests getting the approximate material diameter.
+@pytest.mark.parametrize("diameter, approximate_diameter", [
+    #Some real-life cases that are common in printers.
+    (2.85, 3),
+    (1.75, 2),
+    (3.0, 3),
+    (2.0, 2),
+    #Exceptional cases.
+    (0, 0),
+    (-10.1, -10),
+    (-1, -1)
+])
+def test_approximateMaterialDiameter(diameter, approximate_diameter, global_stack):
+    global_stack.definition = DefinitionContainer(container_id = "TestDefinition")
+    global_stack.definition._metadata["material_diameter"] = str(diameter)
+    assert float(global_stack.approximateMaterialDiameter) == approximate_diameter
+
+##  Tests getting the material diameter when there is no material diameter.
+def test_approximateMaterialDiameterNoDiameter(global_stack):
+    global_stack.definition = DefinitionContainer(container_id = "TestDefinition")
+    assert global_stack.approximateMaterialDiameter == "-1"
+
 #Tests setting user changes profiles to invalid containers.
 @pytest.mark.parametrize("container", [
     getInstanceContainer(container_type = "wrong container type"),