diff --git a/OpenNest.Engine/RectanglePacking/FillNoRotation.cs b/OpenNest.Engine/RectanglePacking/FillNoRotation.cs
deleted file mode 100644
index 8410e70..0000000
--- a/OpenNest.Engine/RectanglePacking/FillNoRotation.cs
+++ /dev/null
@@ -1,65 +0,0 @@
-using OpenNest.Geometry;
-using OpenNest.Math;
-
-namespace OpenNest.Engine.RectanglePacking
-{
-    internal class FillNoRotation : FillEngine
-    {
-        public FillNoRotation(Bin bin)
-            : base(bin) { }
-
-        public NestDirection NestDirection { get; set; }
-
-        public override void Fill(Item item)
-        {
-            var ycount = (int)System.Math.Floor((Bin.Width + Tolerance.Epsilon) / item.Width);
-            var xcount = (int)System.Math.Floor((Bin.Length + Tolerance.Epsilon) / item.Length);
-
-            for (int i = 0; i < xcount; i++)
-            {
-                var x = item.Length * i + Bin.X;
-
-                for (int j = 0; j < ycount; j++)
-                {
-                    var y = item.Width * j + Bin.Y;
-
-                    var addedItem = item.Clone() as Item;
-                    addedItem.Location = new Vector(x, y);
-
-                    Bin.Items.Add(addedItem);
-                }
-            }
-        }
-
-        public override void Fill(Item item, int maxCount)
-        {
-            var ycount = (int)System.Math.Floor((Bin.Width + Tolerance.Epsilon) / item.Width);
-            var xcount = (int)System.Math.Floor((Bin.Length + Tolerance.Epsilon) / item.Length);
-            var count = ycount * xcount;
-
-            if (count <= maxCount)
-            {
-                Fill(item);
-                return;
-            }
-
-            var columns = 0;
-            var rows = 0;
-
-            if (NestDirection == NestDirection.Vertical)
-            {
-                columns = (int)System.Math.Ceiling((double)maxCount / ycount);
-                rows = (int)System.Math.Ceiling((double)maxCount / columns);
-            }
-            else
-            {
-                rows = (int)System.Math.Ceiling((double)maxCount / xcount);
-                columns = (int)System.Math.Ceiling((double)maxCount / rows);
-            }
-
-            Bin.Items.AddRange(
-                FillGrid(item, rows, columns, maxCount, columnMajor: item.Width > item.Length)
-            );
-        }
-    }
-}
diff --git a/OpenNest.Engine/RectanglePacking/FillSameRotation.cs b/OpenNest.Engine/RectanglePacking/FillSameRotation.cs
deleted file mode 100644
index f58ab25..0000000
--- a/OpenNest.Engine/RectanglePacking/FillSameRotation.cs
+++ /dev/null
@@ -1,64 +0,0 @@
-using OpenNest.Math;
-
-namespace OpenNest.Engine.RectanglePacking
-{
-    internal class FillSameRotation : FillEngine
-    {
-        public FillSameRotation(Bin bin)
-            : base(bin) { }
-
-        public override void Fill(Item item)
-        {
-            var bin1 = Bin.Clone() as Bin;
-            var bin2 = Bin.Clone() as Bin;
-
-            var engine = new FillNoRotation(bin1);
-            engine.Fill(item);
-
-            item.Rotate();
-
-            engine.Bin = bin2;
-            engine.Fill(item);
-
-            var density1 = bin1.Density();
-            var density2 = bin2.Density();
-
-            if (density1.IsEqualTo(density2))
-            {
-                var bounds1 = bin1.Items.GetBoundingBox();
-                var bounds2 = bin2.Items.GetBoundingBox();
-
-                if (bounds2.Right < bounds1.Right)
-                    Bin.Items.AddRange(bin2.Items);
-                else
-                    Bin.Items.AddRange(bin1.Items);
-            }
-            else if (density1 > density2)
-                Bin.Items.AddRange(bin1.Items);
-            else
-                Bin.Items.AddRange(bin2.Items);
-        }
-
-        public override void Fill(Item item, int maxCount)
-        {
-            var bin1 = Bin.Clone() as Bin;
-            var bin2 = Bin.Clone() as Bin;
-
-            var engine = new FillNoRotation(bin1);
-            engine.Fill(item, maxCount);
-
-            item.Rotate();
-
-            engine.Bin = bin2;
-            engine.Fill(item, maxCount);
-
-            var bounds1 = bin1.Items.GetBoundingBox();
-            var bounds2 = bin2.Items.GetBoundingBox();
-
-            if (bounds2.Right < bounds1.Right)
-                Bin.Items.AddRange(bin2.Items);
-            else
-                Bin.Items.AddRange(bin1.Items);
-        }
-    }
-}
diff --git a/OpenNest.Engine/RectanglePacking/PackFirstFitDecreasing.cs b/OpenNest.Engine/RectanglePacking/PackFirstFitDecreasing.cs
deleted file mode 100644
index 94f9f71..0000000
--- a/OpenNest.Engine/RectanglePacking/PackFirstFitDecreasing.cs
+++ /dev/null
@@ -1,122 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-using OpenNest.Geometry;
-
-namespace OpenNest.Engine.RectanglePacking
-{
-    internal class FirstFitDecreasing : PackEngine
-    {
-        private readonly List<Level> levels;
-
-        public FirstFitDecreasing(Bin bin)
-            : base(bin)
-        {
-            levels = new List<Level>();
-        }
-
-        public override void Pack(List<Item> items)
-        {
-            items = items.OrderBy(i => -i.Width).ToList();
-
-            foreach (var item in items)
-            {
-                if (item.Width > Bin.Width)
-                    continue;
-
-                var level = FindLevel(item);
-
-                if (level == null)
-                    continue;
-
-                level.AddItem(item);
-            }
-        }
-
-        private Level FindLevel(Item item)
-        {
-            foreach (var level in levels)
-            {
-                if (level.Height < item.Width)
-                    continue;
-
-                if (level.RemainingLength < item.Length)
-                    continue;
-
-                return level;
-            }
-
-            return CreateNewLevel(item);
-        }
-
-        private Level CreateNewLevel(Item item)
-        {
-            var y = Bin.Y;
-            var lastLevel = levels.LastOrDefault();
-
-            if (lastLevel != null)
-                y = lastLevel.Y + lastLevel.Height;
-
-            var remaining = Bin.Top - y;
-
-            if (remaining < item.Width)
-                return null;
-
-            var level = new Level(Bin);
-            level.Y = y;
-            level.Height = item.Width;
-
-            levels.Add(level);
-
-            return level;
-        }
-
-        private class Level
-        {
-            public Level(Bin parent)
-            {
-                Parent = parent;
-                NextItemLocation = parent.Location;
-            }
-
-            public Bin Parent { get; set; }
-
-            private Vector NextItemLocation;
-
-            public double X
-            {
-                get { return Parent.X; }
-            }
-
-            public double Y
-            {
-                get { return NextItemLocation.Y; }
-                set { NextItemLocation.Y = value; }
-            }
-
-            public double LevelLength
-            {
-                get { return Parent.Length; }
-            }
-
-            public double Height { get; set; }
-
-            public double Top
-            {
-                get { return Y + Height; }
-            }
-
-            public double RemainingLength
-            {
-                get { return X + LevelLength - NextItemLocation.X; }
-            }
-
-            public void AddItem(Item item)
-            {
-                item.Location = NextItemLocation;
-                Parent.Items.Add(item);
-
-                NextItemLocation = new Vector(NextItemLocation.X + item.Length, NextItemLocation.Y);
-            }
-        }
-    }
-}