diff --git a/ahb_cmd_export_parts_list.py b/ahb_cmd_export_parts_list.py
index 178be0a..d1305bf 100644
--- a/ahb_cmd_export_parts_list.py
+++ b/ahb_cmd_export_parts_list.py
@@ -5,13 +5,15 @@ import ahb_utils
 from ahb_material import Material
 
 class PartInfo:
-    def __init__(self, document, obj):
+    def __init__(self, workbench, document, obj):
         self.document = document
         self.reference = obj.Label
         
         if len(self.reference) == 3 and self.reference[0:1] in ['L', 'M', 'T', 'R', 'E']:
             self.reference = 'TB_' + self.reference
         
+        workbench.techDrawExtensions.initPartMetadata(obj)
+        
         self.material = 'Unknown'
         try:
             self.material = obj.Assembly_handbook_Material
@@ -52,13 +54,14 @@ class AHB_ExportPartsList:
         all_parts = {}
         
         rootAssembly = Gui.Selection.getSelection()[0]
+        workbench = Gui.getWorkbench("AssemblyHandbookWorkbench") #: :type workbench: AssemblyHandbookWorkbench
 
         def add_part(part):
             #print(part.Label + " (" + part.LinkedObject.Label + ")")
             try:
                 info = all_parts[part.LinkedObject]
             except:
-                info = PartInfo(part.LinkedObject.Document.Name, part.LinkedObject)
+                info = PartInfo(workbench, part.LinkedObject.Document.Name, part.LinkedObject)
                 all_parts[part.LinkedObject] = info
             
             info.count += 1
diff --git a/ahb_material.py b/ahb_material.py
index 0938a07..dde18f9 100644
--- a/ahb_material.py
+++ b/ahb_material.py
@@ -20,3 +20,5 @@ class Material:
     
 Material.DB.append(Material('Stainless steel', density = 8.00))
 Material.DB.append(Material('Aluminium', density = 2.71))
+Material.DB.append(Material('Wood (pine)', density = 0.55))
+Material.DB.append(Material('Plywood', density = 0.6))
diff --git a/ahb_techdraw_extensions.py b/ahb_techdraw_extensions.py
index 9006e86..d01f06d 100644
--- a/ahb_techdraw_extensions.py
+++ b/ahb_techdraw_extensions.py
@@ -807,20 +807,23 @@ class TechDrawExtensions:
 				pass
 			
 			if main_part is not None:
-				current_material = 'Unknown'
-				if 'Assembly_handbook_Material' in main_part.PropertiesList:
-					current_material = main_part.Assembly_handbook_Material
-				else:
-					main_part.addProperty("App::PropertyEnumeration", "Assembly_handbook_Material", "Assembly_handbook")
-				material_list = ['Unknown'] + Material.GetMaterialIDs()
-				main_part.Assembly_handbook_Material = material_list
-				main_part.Assembly_handbook_Material = material_list.index(current_material) if current_material in material_list else 0
-				
-				if 'Assembly_handbook_Weight' not in main_part.PropertiesList:
-					main_part.addProperty("App::PropertyFloat", "Assembly_handbook_Weight", "Assembly_handbook", 'Part weight in grams. Set a negative number if weight is unknown.')
-					main_part.Assembly_handbook_Weight = -1
+				self.initPartMetadata(main_part)
 			
 		QTimer.singleShot(0, doInit)
+		
+	def initPartMetadata(self, part):
+		current_material = 'Unknown'
+		if 'Assembly_handbook_Material' in part.PropertiesList:
+			current_material = part.Assembly_handbook_Material
+		else:
+			part.addProperty("App::PropertyEnumeration", "Assembly_handbook_Material", "Assembly_handbook")
+		material_list = ['Unknown'] + Material.GetMaterialIDs()
+		part.Assembly_handbook_Material = material_list
+		part.Assembly_handbook_Material = material_list.index(current_material) if current_material in material_list else 0
+		
+		if 'Assembly_handbook_Weight' not in part.PropertiesList:
+			part.addProperty("App::PropertyFloat", "Assembly_handbook_Weight", "Assembly_handbook", 'Part weight in grams. Set a negative number if weight is unknown.')
+			part.Assembly_handbook_Weight = -1
 
 	def onPageLoaded(self, page):
 		self.refreshOverlays(page)