diff --git a/GsaGH/Helpers/Export/Geometry/Elements.cs b/GsaGH/Helpers/Export/Geometry/Elements.cs
index bbbe92dde..4bf635ad3 100644
--- a/GsaGH/Helpers/Export/Geometry/Elements.cs
+++ b/GsaGH/Helpers/Export/Geometry/Elements.cs
@@ -3,6 +3,7 @@
 using System.Collections.ObjectModel;
 using System.Linq;
 using GsaAPI;
+using GsaGH.Helpers.Import;
 using GsaGH.Parameters;
 using OasysUnits.Units;
 using Rhino.Geometry;
@@ -46,9 +47,12 @@ internal static void ConvertElement1D(GsaElement1d element1d,
     internal static void ConvertElement1D(List<GsaElement1d> element1ds, ref GsaGuidIntListDictionary<Element> apiElements, ref GsaIntDictionary<Node> existingNodes, LengthUnit unit, ref GsaGuidDictionary<Section> apiSections, ref GsaIntDictionary<SectionModifier> apiSectionModifiers, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
     {
       if (element1ds != null)
+      {
+        element1ds = element1ds.OrderByDescending(x => x.Id).ToList();
         for (int i = 0; i < element1ds.Count; i++)
           if (element1ds[i] != null)
             ConvertElement1D(element1ds[i], ref apiElements, ref existingNodes, unit, ref apiSections, ref apiSectionModifiers, ref apiMaterials);
+      }
     }
     #endregion
 
@@ -83,9 +87,12 @@ internal static void ConvertElement2D(List<GsaElement2d> element2ds,
         ref GsaGuidDictionary<Prop2D> apiProp2ds, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
     {
       if (element2ds != null)
+      {
+        element2ds = element2ds.OrderByDescending(e => e.Ids.First()).ToList();
         for (int i = 0; i < element2ds.Count; i++)
           if (element2ds[i] != null)
             ConvertElement2D(element2ds[i], ref apiElements, ref existingNodes, unit, ref apiProp2ds, ref apiMaterials);
+      }
     }
     #endregion
 
@@ -121,10 +128,13 @@ internal static void ConvertElement3D(List<GsaElement3d> element3ds,
         ref GsaGuidDictionary<Prop3D> apiProp3ds, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
     {
       if (element3ds != null)
+      {
+        element3ds = element3ds.OrderByDescending(e => e.Ids.First()).ToList();
         for (int i = 0; i < element3ds.Count; i++)
           if (element3ds[i] != null)
             ConvertElement3D(element3ds[i], ref apiElements, ref existingNodes, unit, ref apiProp3ds, ref apiMaterials);
+      }
     }
     #endregion
   }
-}
+}
\ No newline at end of file
diff --git a/GsaGH/Helpers/Export/Geometry/Members.cs b/GsaGH/Helpers/Export/Geometry/Members.cs
index 7cca187f9..9122fdae5 100644
--- a/GsaGH/Helpers/Export/Geometry/Members.cs
+++ b/GsaGH/Helpers/Export/Geometry/Members.cs
@@ -10,12 +10,14 @@
 
 namespace GsaGH.Helpers.Export
 {
-    internal class Members
+  internal class Members
   {
     #region topologylist
     private static string CreateTopology(List<Point3d> topology, List<string> topoType, ref GsaIntDictionary<Node> existingNodes, LengthUnit unit)
     {
       string topo = "";
+      if (topology == null)
+        return topo;
       for (int j = 0; j < topology.Count; j++)
       {
         // add the topology type to the topo string first
@@ -53,16 +55,18 @@ internal static void ConvertMember1D(GsaMember1d member1d,
       apiMember.MeshSize = new Length(member1d.MeshSize, unit).Meters;
 
       string topo = CreateTopology(member1d.Topology, member1d.TopologyType, ref existingNodes, unit);
-
-      try //GsaAPI will perform check on topology list
+      if (topo != "")
       {
-        apiMember.Topology = string.Copy(topo.Replace("  ", " "));
-      }
-      catch (Exception)
-      {
-        List<string> errors = member1d.Topology.Select(t => "{" + t.ToString() + "}").ToList();
-        string error = string.Join(", ", errors);
-        throw new Exception(" Invalid topology for Member1d: " + topo + " with original points: " + error);
+        try //GsaAPI will perform check on topology list
+        {
+          apiMember.Topology = string.Copy(topo.Replace("  ", " "));
+        }
+        catch (Exception)
+        {
+          List<string> errors = member1d.Topology.Select(t => "{" + t.ToString() + "}").ToList();
+          string error = string.Join(", ", errors);
+          throw new Exception(" Invalid topology for Member1d: " + topo + " with original points: " + error);
+        }
       }
 
       if (member1d.OrientationNode != null)
@@ -78,14 +82,17 @@ internal static void ConvertMember1D(List<GsaMember1d> member1ds,
         ref GsaGuidDictionary<Section> apiSections, ref GsaIntDictionary<SectionModifier> apiSectionModifiers, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
     {
       if (member1ds != null)
+      {
+        member1ds = member1ds.OrderByDescending(x => x.Id).ToList();
         for (int i = 0; i < member1ds.Count; i++)
           if (member1ds[i] != null)
             ConvertMember1D(member1ds[i], ref apiMembers, ref existingNodes, unit, ref apiSections, ref apiSectionModifiers, ref apiMaterials);
+      }
     }
     #endregion
 
     #region member2d
-    
+
     internal static void ConvertMember2D(GsaMember2d member2d,
         ref GsaGuidDictionary<Member> apiMembers, ref GsaIntDictionary<Node> existingNodes, LengthUnit unit,
         ref GsaGuidDictionary<Prop2D> apiProp2ds, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
@@ -127,9 +134,12 @@ internal static void ConvertMember2D(List<GsaMember2d> member2ds,
         ref GsaGuidDictionary<Prop2D> apiProp2ds, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
     {
       if (member2ds != null)
+      {
+        member2ds = member2ds.OrderByDescending(x => x.Id).ToList();
         for (int i = 0; i < member2ds.Count; i++)
           if (member2ds[i] != null)
             ConvertMember2D(member2ds[i], ref apiMembers, ref existingNodes, unit, ref apiProp2ds, ref apiMaterials);
+      }
     }
     #endregion
 
@@ -145,7 +155,7 @@ internal static void ConvertMember3D(GsaMember3d member3d,
 
       List<string> topos = new List<string>();
       // Loop through the face list
-      
+
       List<int> topoInts = new List<int>();
       foreach (Point3d verticy in member3d.SolidMesh.TopologyVertices)
         topoInts.Add(Nodes.AddNode(ref existingNodes, verticy, unit));
@@ -166,9 +176,12 @@ internal static void ConvertMember3D(List<GsaMember3d> member3ds,
         ref GsaGuidDictionary<Prop3D> apiProp3ds, ref GsaGuidDictionary<AnalysisMaterial> apiMaterials)
     {
       if (member3ds != null)
+      {
+        member3ds = member3ds.OrderByDescending(x => x.Id).ToList();
         for (int i = 0; i < member3ds.Count; i++)
           if (member3ds[i] != null)
             ConvertMember3D(member3ds[i], ref apiMembers, ref existingNodes, unit, ref apiProp3ds, ref apiMaterials);
+      }
     }
     #endregion
   }
diff --git a/GsaGH/Helpers/Export/Geometry/Nodes.cs b/GsaGH/Helpers/Export/Geometry/Nodes.cs
index 8018c26e7..27e69bd6f 100644
--- a/GsaGH/Helpers/Export/Geometry/Nodes.cs
+++ b/GsaGH/Helpers/Export/Geometry/Nodes.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using GsaAPI;
 using GsaGH.Parameters;
 using OasysUnits;
@@ -7,15 +8,18 @@
 
 namespace GsaGH.Helpers.Export
 {
-    internal class Nodes
+  internal class Nodes
   {
     internal static void ConvertNodes(List<GsaNode> nodes, ref GsaIntDictionary<Node> existingNodes,
         ref Dictionary<int, Axis> existingAxes, LengthUnit modelUnit)
     {
       if (nodes != null && nodes.Count > 0)
+      {
+        nodes = nodes.OrderByDescending(n => n.Id).ToList();
         for (int i = 0; i < nodes.Count; i++)
           if (nodes[i] != null)
             ConvertNode(nodes[i], ref existingNodes, ref existingAxes, modelUnit);
+      }
     }
 
     /// <summary>
diff --git a/GsaGH/Helpers/Export/GsaDictionary.cs b/GsaGH/Helpers/Export/GsaDictionary.cs
index 0d7802377..d941c0882 100644
--- a/GsaGH/Helpers/Export/GsaDictionary.cs
+++ b/GsaGH/Helpers/Export/GsaDictionary.cs
@@ -8,7 +8,7 @@ namespace GsaGH.Helpers.Export
   internal class GsaIntDictionary<T>
   {
     private IDictionary<int, T> _dictionary;
-    private int _maxKey = 0;
+    private int _firstEmptyKey = 1;
 
     internal int Count => _dictionary.Count;
     internal ReadOnlyDictionary<int, T> Dictionary => new ReadOnlyDictionary<int, T>(_dictionary);
@@ -16,22 +16,21 @@ internal class GsaIntDictionary<T>
     internal GsaIntDictionary(ReadOnlyDictionary<int, T> dictionary)
     {
       _dictionary = dictionary.ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
-      if (_dictionary.Count > 0)
-        _maxKey = _dictionary.Keys.Max();
+      //if (_dictionary.Count > 0)
+      //  _maxKey = _dictionary.Keys.Max();
     }
 
     internal int AddValue(T value)
     {
-      _maxKey++;
-      _dictionary[_maxKey] = value;
-      return _maxKey;
+      while (_dictionary.ContainsKey(_firstEmptyKey))
+        _firstEmptyKey++;
+      _dictionary[_firstEmptyKey] = value;
+      return _firstEmptyKey;
     }
 
     internal void SetValue(int key, T value)
     {
       _dictionary[key] = value;
-      if (_maxKey <= key)
-        _maxKey = key;
     }
   }
 
@@ -39,7 +38,7 @@ internal class GsaGuidDictionary<T>
   {
     private IDictionary<int, T> _dictionary;
     private IDictionary<Guid, int> _guidDictionary;
-    private int _maxKey = 0;
+    private int _firstEmptyKey = 1;
 
     internal int Count => _dictionary.Count;
     internal ReadOnlyDictionary<int, T> Dictionary => new ReadOnlyDictionary<int, T>(_dictionary);
@@ -49,26 +48,23 @@ internal GsaGuidDictionary(ReadOnlyDictionary<int, T> dictionary)
     {
       _dictionary = dictionary.ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
       _guidDictionary = dictionary.ToDictionary(kvp => Guid.NewGuid(), kvp => kvp.Key);
-      if (_dictionary.Count > 0)
-        _maxKey = _dictionary.Keys.Max();
     }
 
     internal int AddValue(Guid guid, T value)
     {
       if (_guidDictionary.ContainsKey(guid))
         return _guidDictionary[guid];
-      _maxKey++;
-      _dictionary[_maxKey] = value;
-      _guidDictionary[guid] = _maxKey;
-      return _maxKey;
+      while (_dictionary.ContainsKey(_firstEmptyKey))
+        _firstEmptyKey++;
+      _dictionary[_firstEmptyKey] = value;
+      _guidDictionary[guid] = _firstEmptyKey;
+      return _firstEmptyKey;
     }
 
     internal void SetValue(int key, Guid guid, T value)
     {
       _dictionary[key] = value;
       _guidDictionary[guid] = key;
-      if (_maxKey <= key)
-        _maxKey = key;
     }
   }
 
@@ -76,7 +72,7 @@ internal class GsaGuidIntListDictionary<T>
   {
     private IDictionary<int, T> _dictionary;
     private IDictionary<Guid, Collection<int>> _guidDictionary;
-    private int _maxKey = 0;
+    private int _firstEmptyKey = 1;
 
     internal int Count => _dictionary.Count;
     internal ReadOnlyDictionary<int, T> Dictionary => new ReadOnlyDictionary<int, T>(_dictionary);
@@ -86,31 +82,28 @@ internal GsaGuidIntListDictionary(ReadOnlyDictionary<int, T> dictionary)
     {
       _dictionary = dictionary.ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
       _guidDictionary = dictionary.ToDictionary(kvp => Guid.NewGuid(), kvp => new Collection<int>() { kvp.Key });
-      if (_dictionary.Count > 0)
-        _maxKey = _dictionary.Keys.Max();
     }
 
     internal int AddValue(Guid guid, T value)
     {
-      _maxKey++;
+      while (_dictionary.ContainsKey(_firstEmptyKey))
+        _firstEmptyKey++;
       if (_guidDictionary.ContainsKey(guid))
       {
-        _dictionary[_maxKey] = value;
-        _guidDictionary[guid].Add(_maxKey);
+        _dictionary[_firstEmptyKey] = value;
+        _guidDictionary[guid].Add(_firstEmptyKey);
       }
       else
       {
-        _dictionary[_maxKey] = value;
-        _guidDictionary[guid] = new Collection<int>() { _maxKey };
+        _dictionary[_firstEmptyKey] = value;
+        _guidDictionary[guid] = new Collection<int>() { _firstEmptyKey };
       }
-      return _maxKey;
+      return _firstEmptyKey;
     }
 
     internal void SetValue(int key, Guid guid, T value, bool overwrite)
     {
       _dictionary[key] = value;
-      if (_maxKey <= key)
-        _maxKey = key;
       if (_guidDictionary.ContainsKey(guid) && !overwrite)
       {
         if (!_guidDictionary[guid].Contains(key))
diff --git a/GsaGHTests/Helpers/Export/AssembleModelTestsNodes.cs b/GsaGHTests/Helpers/Export/AssembleModelTestsNodes.cs
index 318e47edc..4f428c48d 100644
--- a/GsaGHTests/Helpers/Export/AssembleModelTestsNodes.cs
+++ b/GsaGHTests/Helpers/Export/AssembleModelTestsNodes.cs
@@ -56,7 +56,7 @@ public void AssembleModelWithNodesTest()
         CreateModelTest.CreateModelFromGeometry(new List<GsaNodeGoo>() { node1, node2 }, null, null, null, null, null, ModelUnit.m));
 
       TestNode(node1.Value, LengthUnit.Meter, 2, modelGoo.Value);
-      TestNode(node2.Value, LengthUnit.Meter, 3, modelGoo.Value);
+      TestNode(node2.Value, LengthUnit.Meter, 1, modelGoo.Value);
     }
   }
 }
diff --git a/GsaGHTests/Helpers/Export/GsaDictionaryTests.cs b/GsaGHTests/Helpers/Export/GsaDictionaryTests.cs
index 3b1b4ed6c..2eaa24959 100644
--- a/GsaGHTests/Helpers/Export/GsaDictionaryTests.cs
+++ b/GsaGHTests/Helpers/Export/GsaDictionaryTests.cs
@@ -34,9 +34,9 @@ public void GsaIntDictionaryWithExistingAddTest()
 
       int expectedID = dictionary.AddValue("myFirst");
 
-      Assert.Equal(6, expectedID);
+      Assert.Equal(2, expectedID);
       Assert.Equal(3, dictionary.Count);
-      Assert.Equal("myFirst", dictionary.Dictionary[6]);
+      Assert.Equal("myFirst", dictionary.Dictionary[2]);
     }
 
     [Fact]
@@ -104,9 +104,9 @@ public void GsaGuidDictionaryWithExistingAddTest()
       Guid guid = Guid.NewGuid();
       int expectedID = dictionary.AddValue(guid, "myFirst");
 
-      Assert.Equal(6, expectedID);
+      Assert.Equal(2, expectedID);
       Assert.Equal(3, dictionary.Count);
-      Assert.Equal("myFirst", dictionary.Dictionary[6]);
+      Assert.Equal("myFirst", dictionary.Dictionary[2]);
 
       // try to add with same guid but different object
       Assert.Equal(expectedID, dictionary.AddValue(guid, "second"));
@@ -212,11 +212,11 @@ public void GsaGuidIntListDictionaryWithExistingAddTest()
       expectedIDs.Add(dictionary.AddValue(guid, "myFirst"));
       expectedIDs.Add(dictionary.AddValue(guid, "mySecond"));
 
-      Assert.Equal(6, expectedIDs[0]);
-      Assert.Equal(7, expectedIDs[1]);
+      Assert.Equal(2, expectedIDs[0]);
+      Assert.Equal(3, expectedIDs[1]);
       Assert.Equal(4, dictionary.Count);
-      Assert.Equal("myFirst", dictionary.Dictionary[6]);
-      Assert.Equal("mySecond", dictionary.Dictionary[7]);
+      Assert.Equal("myFirst", dictionary.Dictionary[2]);
+      Assert.Equal("mySecond", dictionary.Dictionary[3]);
     }
 
     [Fact]
@@ -237,7 +237,7 @@ public void GsaGuidIntListDictionaryWithExistingSetTest()
       Assert.Equal("myFirst", dictionary.Dictionary[5]);
       Assert.Equal(2, dictionary.GuidDictionary[guid].Count);
 
-      Assert.Equal("mySecond", dictionary.Dictionary[6]);
+      Assert.Equal("mySecond", dictionary.Dictionary[2]);
     }
 
     [Fact]