diff --git a/src/blenderbim/blenderbim/bim/module/material/operator.py b/src/blenderbim/blenderbim/bim/module/material/operator.py
index 07f541e777..3cb818f5c1 100644
--- a/src/blenderbim/blenderbim/bim/module/material/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/material/operator.py
@@ -496,16 +496,21 @@ class EditAssignedMaterial(bpy.types.Operator):
         if self.material_set_usage:
             material_set_usage = self.file.by_id(self.material_set_usage)
             attributes = blenderbim.bim.helper.export_attributes(props.material_set_usage_attributes)
-            if attributes.get("CardinalPoint", None):
-                attributes["CardinalPoint"] = int(attributes["CardinalPoint"])
-            ifcopenshell.api.run(
-                "material.edit_profile_usage",
-                self.file,
-                **{"usage": material_set_usage, "attributes": attributes},
-            )
             if material_set_usage.is_a("IfcMaterialLayerSetUsage"):
+                ifcopenshell.api.run(
+                    "material.edit_layer_usage",
+                    self.file,
+                    **{"usage": material_set_usage, "attributes": attributes},
+                )
                 Data.load_layer_usages()
             elif material_set_usage.is_a("IfcMaterialProfileSetUsage"):
+                if attributes.get("CardinalPoint", None):
+                    attributes["CardinalPoint"] = int(attributes["CardinalPoint"])
+                ifcopenshell.api.run(
+                    "material.edit_profile_usage",
+                    self.file,
+                    **{"usage": material_set_usage, "attributes": attributes},
+                )
                 Data.load_profile_usages()
 
         if material_set.is_a("IfcMaterialConstituentSet"):
diff --git a/src/blenderbim/blenderbim/bim/module/material/ui.py b/src/blenderbim/blenderbim/bim/module/material/ui.py
index d083e4b07a..d0e2b1ade4 100644
--- a/src/blenderbim/blenderbim/bim/module/material/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/material/ui.py
@@ -318,11 +318,11 @@ class BIM_PT_object_material(Panel):
                 item_name = item.get("Name", "Unnamed") or "Unnamed"
                 thickness = item.get("LayerThickness")
                 if thickness:
-                    item_name += f" ({thickness})"
+                    item_name += f" ({thickness:.3f})"
                     total_thickness += thickness
                 row.label(text=item_name, icon="ALIGN_CENTER")
                 row.label(text=Data.materials[item["Material"]]["Name"], icon="MATERIAL")
 
         if total_thickness:
             row = self.layout.row(align=True)
-            row.label(text=f"Total Thickness: {total_thickness}")
+            row.label(text=f"Total Thickness: {total_thickness:.3f}")
diff --git a/src/ifcopenshell-python/ifcopenshell/api/material/edit_layer_usage.py b/src/ifcopenshell-python/ifcopenshell/api/material/edit_layer_usage.py
new file mode 100644
index 0000000000..6902672574
--- /dev/null
+++ b/src/ifcopenshell-python/ifcopenshell/api/material/edit_layer_usage.py
@@ -0,0 +1,10 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"usage": None, "attributes": {}}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for name, value in self.settings["attributes"].items():
+            setattr(self.settings["usage"], name, value)