diff --git a/OpenNest/Controls/FilterPanel.cs b/OpenNest/Controls/FilterPanel.cs
new file mode 100644
index 0000000..9c72cb7
--- /dev/null
+++ b/OpenNest/Controls/FilterPanel.cs
@@ -0,0 +1,257 @@
+using OpenNest.Bending;
+using OpenNest.Geometry;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace OpenNest.Controls
+{
+    public class FilterPanel : Panel
+    {
+        private readonly CollapsiblePanel layersPanel;
+        private readonly CollapsiblePanel colorsPanel;
+        private readonly CollapsiblePanel lineTypesPanel;
+        private readonly CollapsiblePanel bendLinesPanel;
+
+        private readonly CheckedListBox layersList;
+        private readonly CheckedListBox colorsList;
+        private readonly CheckedListBox lineTypesList;
+        private readonly ListBox bendLinesList;
+
+        private List<Entity> currentEntities;
+        private List<Bend> currentBends;
+
+        public event EventHandler FilterChanged;
+        public event EventHandler<int> BendLineSelected;
+        public event EventHandler<int> BendLineRemoved;
+
+        public FilterPanel()
+        {
+            AutoScroll = true;
+            BackColor = Color.White;
+
+            // Bend Lines
+            bendLinesPanel = new CollapsiblePanel
+            {
+                HeaderText = "Bend Lines (0)",
+                Dock = DockStyle.Top,
+                ExpandedHeight = 120,
+                IsExpanded = false
+            };
+            bendLinesList = new ListBox
+            {
+                Dock = DockStyle.Fill,
+                BorderStyle = BorderStyle.None,
+                Font = new Font("Segoe UI", 9f)
+            };
+            bendLinesList.SelectedIndexChanged += (s, e) =>
+                BendLineSelected?.Invoke(this, bendLinesList.SelectedIndex);
+
+            var bendDeleteLink = new LinkLabel
+            {
+                Text = "Remove Selected",
+                Dock = DockStyle.Bottom,
+                Height = 20,
+                Font = new Font("Segoe UI", 8f)
+            };
+            bendDeleteLink.LinkClicked += (s, e) =>
+            {
+                if (bendLinesList.SelectedIndex >= 0)
+                    BendLineRemoved?.Invoke(this, bendLinesList.SelectedIndex);
+            };
+
+            bendLinesPanel.ContentPanel.Controls.Add(bendLinesList);
+            bendLinesPanel.ContentPanel.Controls.Add(bendDeleteLink);
+
+            // Line Types
+            lineTypesPanel = new CollapsiblePanel
+            {
+                HeaderText = "Line Types (0)",
+                Dock = DockStyle.Top,
+                ExpandedHeight = 100,
+                IsExpanded = false
+            };
+            lineTypesList = CreateCheckedList();
+            lineTypesPanel.ContentPanel.Controls.Add(lineTypesList);
+
+            // Colors
+            colorsPanel = new CollapsiblePanel
+            {
+                HeaderText = "Colors (0)",
+                Dock = DockStyle.Top,
+                ExpandedHeight = 100,
+                IsExpanded = false
+            };
+            colorsList = CreateCheckedList();
+            colorsList.DrawMode = DrawMode.OwnerDrawFixed;
+            colorsList.ItemHeight = 20;
+            colorsList.DrawItem += ColorsList_DrawItem;
+            colorsPanel.ContentPanel.Controls.Add(colorsList);
+
+            // Layers (always expanded)
+            layersPanel = new CollapsiblePanel
+            {
+                HeaderText = "Layers",
+                Dock = DockStyle.Top,
+                ExpandedHeight = 160,
+                IsExpanded = true
+            };
+
+            var checkAllPanel = new Panel { Dock = DockStyle.Top, Height = 22 };
+            var checkAll = new LinkLabel { Text = "All", AutoSize = true, Location = new Point(4, 2), Font = new Font("Segoe UI", 8f) };
+            var uncheckAll = new LinkLabel { Text = "None", AutoSize = true, Location = new Point(30, 2), Font = new Font("Segoe UI", 8f) };
+            checkAll.LinkClicked += (s, e) => SetAllChecked(layersList, true);
+            uncheckAll.LinkClicked += (s, e) => SetAllChecked(layersList, false);
+            checkAllPanel.Controls.AddRange(new Control[] { checkAll, uncheckAll });
+
+            layersList = CreateCheckedList();
+            layersPanel.ContentPanel.Controls.Add(layersList);
+            layersPanel.ContentPanel.Controls.Add(checkAllPanel);
+
+            // Add panels in reverse order (Dock.Top stacks top-down)
+            Controls.Add(bendLinesPanel);
+            Controls.Add(lineTypesPanel);
+            Controls.Add(colorsPanel);
+            Controls.Add(layersPanel);
+        }
+
+        private CheckedListBox CreateCheckedList()
+        {
+            var list = new CheckedListBox
+            {
+                Dock = DockStyle.Fill,
+                BorderStyle = BorderStyle.None,
+                CheckOnClick = true,
+                Font = new Font("Segoe UI", 9f)
+            };
+            list.ItemCheck += (s, e) =>
+                BeginInvoke((Action)(() => FilterChanged?.Invoke(this, EventArgs.Empty)));
+            return list;
+        }
+
+        public void LoadItem(List<Entity> entities, List<Bend> bends)
+        {
+            currentEntities = entities;
+            currentBends = bends;
+
+            // Layers
+            layersList.Items.Clear();
+            var layers = entities
+                .Where(e => e.Layer != null)
+                .Select(e => e.Layer.Name)
+                .Distinct();
+            foreach (var layer in layers)
+                layersList.Items.Add(layer, true); // checked = visible
+
+            layersPanel.HeaderText = $"Layers ({layersList.Items.Count})";
+
+            // Colors
+            colorsList.Items.Clear();
+            var colors = entities
+                .Select(e => e.Color.ToArgb())
+                .Distinct()
+                .Select(argb => new ColorItem(Color.FromArgb(argb)));
+            foreach (var color in colors)
+                colorsList.Items.Add(color, true); // checked = visible
+
+            colorsPanel.HeaderText = $"Colors ({colorsList.Items.Count})";
+
+            // Line Types
+            lineTypesList.Items.Clear();
+            var lineTypes = entities
+                .Select(e => e.LineTypeName ?? "Continuous")
+                .Distinct();
+            foreach (var lt in lineTypes)
+                lineTypesList.Items.Add(lt, true); // checked = visible
+
+            lineTypesPanel.HeaderText = $"Line Types ({lineTypesList.Items.Count})";
+
+            // Bend Lines
+            bendLinesList.Items.Clear();
+            if (bends != null)
+            {
+                foreach (var bend in bends)
+                    bendLinesList.Items.Add(bend.ToString());
+            }
+
+            var bendCount = bends?.Count ?? 0;
+            bendLinesPanel.HeaderText = $"Bend Lines ({bendCount})";
+            bendLinesPanel.IsExpanded = bendCount > 0;
+        }
+
+        public void ApplyFilters(List<Entity> entities)
+        {
+            var hiddenLayers = new HashSet<string>();
+            for (var i = 0; i < layersList.Items.Count; i++)
+            {
+                if (!layersList.GetItemChecked(i))
+                    hiddenLayers.Add(layersList.Items[i].ToString());
+            }
+
+            var hiddenColors = new HashSet<int>();
+            for (var i = 0; i < colorsList.Items.Count; i++)
+            {
+                if (!colorsList.GetItemChecked(i))
+                    hiddenColors.Add(((ColorItem)colorsList.Items[i]).Argb);
+            }
+
+            var hiddenLineTypes = new HashSet<string>();
+            for (var i = 0; i < lineTypesList.Items.Count; i++)
+            {
+                if (!lineTypesList.GetItemChecked(i))
+                    hiddenLineTypes.Add(lineTypesList.Items[i].ToString());
+            }
+
+            foreach (var entity in entities)
+            {
+                var layerVisible = entity.Layer?.Name == null || !hiddenLayers.Contains(entity.Layer.Name);
+                var colorVisible = !hiddenColors.Contains(entity.Color.ToArgb());
+                var ltVisible = !hiddenLineTypes.Contains(entity.LineTypeName ?? "Continuous");
+
+                entity.IsVisible = layerVisible && colorVisible && ltVisible;
+                if (entity.Layer != null)
+                    entity.Layer.IsVisible = !hiddenLayers.Contains(entity.Layer.Name);
+            }
+        }
+
+        private void SetAllChecked(CheckedListBox list, bool isChecked)
+        {
+            for (var i = 0; i < list.Items.Count; i++)
+                list.SetItemChecked(i, isChecked);
+        }
+
+        private void ColorsList_DrawItem(object sender, DrawItemEventArgs e)
+        {
+            if (e.Index < 0) return;
+
+            e.DrawBackground();
+
+            var colorItem = (ColorItem)colorsList.Items[e.Index];
+            var swatchRect = new Rectangle(e.Bounds.Left + 20, e.Bounds.Top + 2, 16, e.Bounds.Height - 4);
+
+            using (var brush = new SolidBrush(colorItem.Color))
+                e.Graphics.FillRectangle(brush, swatchRect);
+            e.Graphics.DrawRectangle(Pens.Gray, swatchRect);
+
+            e.DrawFocusRectangle();
+        }
+    }
+
+    public class ColorItem
+    {
+        public int Argb { get; }
+        public Color Color { get; }
+
+        public ColorItem(Color color)
+        {
+            Color = color;
+            Argb = color.ToArgb();
+        }
+
+        public override string ToString() => $"#{Color.R:X2}{Color.G:X2}{Color.B:X2}";
+        public override bool Equals(object obj) => obj is ColorItem other && Argb == other.Argb;
+        public override int GetHashCode() => Argb;
+    }
+}