diff --git a/src/Mod/Arch/importIFC.py b/src/Mod/Arch/importIFC.py
index c759cfab65..eda396c7ac 100644
--- a/src/Mod/Arch/importIFC.py
+++ b/src/Mod/Arch/importIFC.py
@@ -1583,7 +1583,7 @@ def export(exportList,filename):
             if "IfcUID" in obj.IfcData.keys():
                 uid = str(obj.IfcData["IfcUID"])
         if not uid:
-            uid = ifcopenshell.guid.compress(uuid.uuid1().hex)
+            uid = ifcopenshell.guid.new()
             # storing the uid for further use
             if STORE_UID and hasattr(obj,"IfcData"):
                 d = obj.IfcData
@@ -1716,7 +1716,7 @@ def export(exportList,filename):
                 if six.PY2:
                     l = l.encode("utf8")
                 prod2 = ifcfile.createIfcBuildingElementProxy(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     l,
                     None,
@@ -1728,7 +1728,7 @@ def export(exportList,filename):
                 )
                 subproducts[o.Name] = prod2
                 ifcfile.createIfcRelAggregates(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'Addition',
                     '',
@@ -1753,7 +1753,7 @@ def export(exportList,filename):
                 if six.PY2:
                     l = l.encode("utf8")
                 prod2 = ifcfile.createIfcOpeningElement(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     l,
                     None,
@@ -1764,7 +1764,7 @@ def export(exportList,filename):
                 )
                 subproducts[o.Name] = prod2
                 ifcfile.createIfcRelVoidsElement(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'Subtraction',
                     '',
@@ -1840,14 +1840,14 @@ def export(exportList,filename):
                             psets.setdefault(pset,[]).append(p)
                     for pname,props in psets.items():
                         pset = ifcfile.createIfcPropertySet(
-                            ifcopenshell.guid.compress(uuid.uuid1().hex),
+                            ifcopenshell.guid.new(),
                             history,
                             pname,
                             None,
                             props
                         )
                         ifcfile.createIfcRelDefinesByProperties(
-                            ifcopenshell.guid.compress(uuid.uuid1().hex),
+                            ifcopenshell.guid.new(),
                             history,
                             None,
                             None,
@@ -1916,13 +1916,13 @@ def export(exportList,filename):
                                 print("Unable to create a property of type:",tp)
                         if props:
                             pset = ifcfile.createIfcPropertySet(
-                                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                                ifcopenshell.guid.new(),
                                 history,cat,
                                 None,
                                 props
                             )
                             ifcfile.createIfcRelDefinesByProperties(
-                                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                                ifcopenshell.guid.new(),
                                 history,
                                 None,
                                 None,
@@ -1966,14 +1966,14 @@ def export(exportList,filename):
                         props.append(ifcbin.createIfcPropertySingleValue(str(key),str(tp),val))
                 if props:
                     pset = ifcfile.createIfcPropertySet(
-                        ifcopenshell.guid.compress(uuid.uuid1().hex),
+                        ifcopenshell.guid.new(),
                         history,
                         'PropertySet',
                         None,
                         props
                     )
                     ifcfile.createIfcRelDefinesByProperties(
-                        ifcopenshell.guid.compress(uuid.uuid1().hex),
+                        ifcopenshell.guid.new(),
                         history,
                         None,
                         None,
@@ -2003,14 +2003,14 @@ def export(exportList,filename):
                 quantities.append(ifcfile.createIfcQuantityVolume('Volume',None,None,obj.Shape.Volume/1000000000.0))
             if quantities:
                 eltq = ifcfile.createIfcElementQuantity(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     "ElementQuantities",
                     None,
                     "FreeCAD",quantities
                 )
                 ifcfile.createIfcRelDefinesByProperties(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     None,
                     None,
@@ -2087,13 +2087,13 @@ def export(exportList,filename):
                                     FreeCADProps.append(ifcbin.createIfcPropertySingleValue("FreeCAD_"+prop,itype,ivalue))
             if FreeCADProps:
                 pset = ifcfile.createIfcPropertySet(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,'FreeCADPropertySet',
                     None,
                     FreeCADProps
                 )
                 ifcfile.createIfcRelDefinesByProperties(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     None,
                     None,
@@ -2102,14 +2102,14 @@ def export(exportList,filename):
                 )
             if FreeCADGuiProps:
                 pset = ifcfile.createIfcPropertySet(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'FreeCADGuiPropertySet',
                     None,
                     FreeCADGuiProps
                 )
                 ifcfile.createIfcRelDefinesByProperties(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     None,
                     None,
@@ -2139,7 +2139,7 @@ def export(exportList,filename):
                         treated.append(c.Name)
                 if subs:
                     ifcfile.createIfcRelAggregates(
-                        ifcopenshell.guid.compress(uuid.uuid1().hex),
+                        ifcopenshell.new(),
                         history,
                         'Assembly',
                         '',
@@ -2163,7 +2163,7 @@ def export(exportList,filename):
             f = products[floor.Name]
             if children:
                 ifcfile.createIfcRelContainedInSpatialStructure(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.new(),
                     history,
                     'StoreyLink',
                     '',
@@ -2194,7 +2194,7 @@ def export(exportList,filename):
             b = products[building.Name]
             if children:
                 ifcfile.createIfcRelContainedInSpatialStructure(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'BuildingLink',
                     '',
@@ -2203,7 +2203,7 @@ def export(exportList,filename):
                 )
             if childfloors:
                 ifcfile.createIfcRelAggregates(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'BuildingLink',
                     '',
@@ -2233,7 +2233,7 @@ def export(exportList,filename):
     if not sites:
         if DEBUG: print("No site found. Adding default site")
         sites = [ifcfile.createIfcSite(
-            ifcopenshell.guid.compress(uuid.uuid1().hex),
+            ifcopenshell.guid.new(),
             history,"Default Site",
             '',
             None,
@@ -2248,7 +2248,7 @@ def export(exportList,filename):
             None
         )]
     ifcfile.createIfcRelAggregates(
-        ifcopenshell.guid.compress(uuid.uuid1().hex),
+        ifcopenshell.guid.new(),
         history,
         'ProjectLink',
         '',
@@ -2257,7 +2257,7 @@ def export(exportList,filename):
     if not buildings:
         if DEBUG: print("No building found. Adding default building")
         buildings = [ifcfile.createIfcBuilding(
-            ifcopenshell.guid.compress(uuid.uuid1().hex),
+            ifcopenshell.guid.new(),
             history,
             "Default Building",
             '',
@@ -2272,14 +2272,14 @@ def export(exportList,filename):
         )]
         if floors:
             ifcfile.createIfcRelAggregates(
-                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                ifcopenshell.guid.new(),
                 history,
                 'BuildingLink',
                 '',
                 buildings[0],floors
             )
     ifcfile.createIfcRelAggregates(
-        ifcopenshell.guid.compress(uuid.uuid1().hex),
+        ifcopenshell.guid.new(),
         history,
         'SiteLink',
         '',
@@ -2298,7 +2298,7 @@ def export(exportList,filename):
     if untreated:
         if not defaulthost:
             defaulthost = ifcfile.createIfcBuildingStorey(
-                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                ifcopenshell.guid.new(),
                 history,
                 "Default Storey",
                 '',
@@ -2310,7 +2310,7 @@ def export(exportList,filename):
                 None
             )
             ifcfile.createIfcRelAggregates(
-                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                ifcopenshell.guid.new(),
                 history,
                 'DefaultStoreyLink',
                 '',
@@ -2318,7 +2318,7 @@ def export(exportList,filename):
                 [defaulthost]
             )
         ifcfile.createIfcRelContainedInSpatialStructure(
-            ifcopenshell.guid.compress(uuid.uuid1().hex),
+            ifcopenshell.guid.new(),
             history,
             'UnassignedObjectsLink',
             '',
@@ -2363,7 +2363,7 @@ def export(exportList,filename):
                 isr = ifcfile.createIfcStyledRepresentation(context,"Style","Material",[isi])
                 imd = ifcfile.createIfcMaterialDefinitionRepresentation(None,None,[isr],mat)
             ifcfile.createIfcRelAssociatesMaterial(
-                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                ifcopenshell.guid.new(),
                 history,
                 'MaterialLink',
                 '',
@@ -2443,7 +2443,7 @@ def export(exportList,filename):
             if six.PY2:
                 l = l.encode("utf8")
             ann = ifcfile.createIfcAnnotation(
-                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                ifcopenshell.guid.new(),
                 history,l,
                 '',
                 None,
@@ -2486,7 +2486,7 @@ def export(exportList,filename):
                 if six.PY2:
                     name = name.encode("utf8")
                 grp = ifcfile.createIfcGroup(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     name,
                     '',
@@ -2495,7 +2495,7 @@ def export(exportList,filename):
                 products[g[0]] = grp
                 spatialelements[g[0]] = grp
                 ass = ifcfile.createIfcRelAssignsToGroup(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'GroupLink',
                     '',
@@ -2515,7 +2515,7 @@ def export(exportList,filename):
                     stack.setdefault(parent.Name,[]).append(spatialelements[g[0]])
     for k,v in stack.items():
         ifcfile.createIfcRelAggregates(
-            ifcopenshell.guid.compress(uuid.uuid1().hex),
+            ifcopenshell.guid.new(),
             history,
             'GroupStackLink',
             '',
@@ -2530,7 +2530,7 @@ def export(exportList,filename):
         if remaining:
             if not defaulthost:
                 defaulthost = ifcfile.createIfcBuildingStorey(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     "Default Storey",
                     '',
@@ -2542,7 +2542,7 @@ def export(exportList,filename):
                     None
                 )
                 ifcfile.createIfcRelAggregates(
-                    ifcopenshell.guid.compress(uuid.uuid1().hex),
+                    ifcopenshell.guid.new(),
                     history,
                     'DefaultStoreyLink',
                     '',
@@ -2550,7 +2550,7 @@ def export(exportList,filename):
                     [defaulthost]
                 )
             ifcfile.createIfcRelContainedInSpatialStructure(
-                ifcopenshell.guid.compress(uuid.uuid1().hex),
+                ifcopenshell.guid.new(),
                 history,
                 'AnnotationsLink',
                 '',