diff --git a/OpenNest.WinForms.Tests/Forms/NestDefaultsFormTests.cs b/OpenNest.WinForms.Tests/Forms/NestDefaultsFormTests.cs
new file mode 100644
index 00000000..f350fdf2
--- /dev/null
+++ b/OpenNest.WinForms.Tests/Forms/NestDefaultsFormTests.cs
@@ -0,0 +1,61 @@
+using System.Windows.Forms;
+using OpenNest.Data;
+using OpenNest.Forms;
+using OpenNest.Geometry;
+
+namespace OpenNest.WinForms.Tests.Forms;
+
+public class NestDefaultsFormTests
+{
+    [Fact]
+    public void SwitchingUnitsConvertsTheShownValues()
+    {
+        RunSta(() =>
+        {
+            var machine = new MachineConfig { Name = "Laser" };
+            var defaults = new NestDefaults
+            {
+                Units = Units.Inches,
+                Size = new Size(48, 96),
+                Quadrant = 3,
+                PartSpacing = 0.25,
+                EdgeSpacing = new Spacing(0.5, 1, 1.5, 2),
+                MachineId = machine.Id,
+            };
+            using var form = new NestDefaultsForm(defaults, new[] { machine }, ("Saved on this PC.", false));
+            Assert.Equal("in", Control<OpenNest.Controls.NumericUpDown>(form, "widthBox").Suffix);
+
+            Control<RadioButton>(form, "millimetersRadio").Checked = true;
+
+            var converted = form.GetDefaults();
+            Assert.Equal(Units.Millimeters, converted.Units);
+            Assert.Equal(new Size(1219.2, 2438.4), converted.Size);
+            Assert.Equal(6.35, converted.PartSpacing);
+            Assert.Equal(new Spacing(12.7, 25.4, 38.1, 50.8), converted.EdgeSpacing);
+            Assert.Equal(3, converted.Quadrant);
+            Assert.Equal(machine.Id, converted.MachineId);
+            Assert.Equal("mm", Control<OpenNest.Controls.NumericUpDown>(form, "edgeTopBox").Suffix);
+
+            Control<RadioButton>(form, "inchesRadio").Checked = true;
+            Assert.Equal(new Size(48, 96), form.GetDefaults().Size);
+        });
+    }
+
+    [Fact]
+    public void ReadOnlySourceDisablesSave()
+    {
+        RunSta(() =>
+        {
+            using var form = new NestDefaultsForm(new NestDefaults(), Array.Empty<MachineConfig>(),
+                ("Shared, read-only: the server cannot be reached.", true));
+            Assert.False(Control<Button>(form, "saveButton").Enabled);
+            Assert.Equal("Shared, read-only: the server cannot be reached.", Control<Label>(form, "sourceLabel").Text);
+        });
+    }
+
+    private static T Control<T>(NestDefaultsForm form, string name) where T : Control =>
+        Assert.IsType<T>(form.Controls.Find(name, true).Single());
+
+    private static void RunSta(System.Action action) =>
+        StaTestThread.Run(action, Timeout.InfiniteTimeSpan, "The STA test did not complete.");
+}
diff --git a/OpenNest/Forms/MainForm.Tools.cs b/OpenNest/Forms/MainForm.Tools.cs
index e322797e..f48a9e97 100644
--- a/OpenNest/Forms/MainForm.Tools.cs
+++ b/OpenNest/Forms/MainForm.Tools.cs
@@ -172,7 +172,9 @@ namespace OpenNest.Forms
 
         private void NestDefaults_Click(object sender, EventArgs e)
         {
-            using (var form = new NestDefaultsForm(MachineSettings.LoadSavedNestDefaults(out _), MachineSettings.LoadMachines()))
+            var defaults = MachineSettings.LoadSavedNestDefaults(out _);
+            SharedSettings.WarnIfOffline(this);
+            using (var form = new NestDefaultsForm(defaults, MachineSettings.LoadMachines(), SharedSettings.NestDefaultsSource()))
             {
                 if (form.ShowDialog(this) == DialogResult.OK)
                     SaveNestDefaults(form.GetDefaults());
diff --git a/OpenNest/Forms/NestDefaultsForm.Designer.cs b/OpenNest/Forms/NestDefaultsForm.Designer.cs
index ed98ba57..fb3fb3ae 100644
--- a/OpenNest/Forms/NestDefaultsForm.Designer.cs
+++ b/OpenNest/Forms/NestDefaultsForm.Designer.cs
@@ -28,307 +28,320 @@ namespace OpenNest.Forms
         /// </summary>
         private void InitializeComponent()
         {
-            this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
+            this.components = new System.ComponentModel.Container();
+            this.generalGroup = new System.Windows.Forms.GroupBox();
+            this.machineLabel = new System.Windows.Forms.Label();
+            this.machineCombo = new System.Windows.Forms.ComboBox();
             this.unitsLabel = new System.Windows.Forms.Label();
-            this.unitsCombo = new System.Windows.Forms.ComboBox();
+            this.inchesRadio = new System.Windows.Forms.RadioButton();
+            this.millimetersRadio = new System.Windows.Forms.RadioButton();
+            this.plateGroup = new System.Windows.Forms.GroupBox();
             this.widthLabel = new System.Windows.Forms.Label();
             this.widthBox = new OpenNest.Controls.NumericUpDown();
             this.lengthLabel = new System.Windows.Forms.Label();
             this.lengthBox = new OpenNest.Controls.NumericUpDown();
+            this.quadrantGroup = new System.Windows.Forms.GroupBox();
+            this.quadrantSelect1 = new OpenNest.Controls.QuadrantSelect();
+            this.quadrantHintLabel = new System.Windows.Forms.Label();
+            this.spacingGroup = new System.Windows.Forms.GroupBox();
             this.partSpacingLabel = new System.Windows.Forms.Label();
             this.partSpacingBox = new OpenNest.Controls.NumericUpDown();
-            this.edgeLeftLabel = new System.Windows.Forms.Label();
-            this.edgeLeftBox = new OpenNest.Controls.NumericUpDown();
-            this.edgeBottomLabel = new System.Windows.Forms.Label();
-            this.edgeBottomBox = new OpenNest.Controls.NumericUpDown();
-            this.edgeRightLabel = new System.Windows.Forms.Label();
-            this.edgeRightBox = new OpenNest.Controls.NumericUpDown();
-            this.edgeTopLabel = new System.Windows.Forms.Label();
+            this.edgeSpacingLabel = new System.Windows.Forms.Label();
             this.edgeTopBox = new OpenNest.Controls.NumericUpDown();
-            this.quadrantLabel = new System.Windows.Forms.Label();
-            this.quadrantSelect1 = new OpenNest.Controls.QuadrantSelect();
-            this.machineLabel = new System.Windows.Forms.Label();
-            this.machineCombo = new System.Windows.Forms.ComboBox();
+            this.edgeLeftBox = new OpenNest.Controls.NumericUpDown();
+            this.edgePlateLabel = new System.Windows.Forms.Label();
+            this.edgeRightBox = new OpenNest.Controls.NumericUpDown();
+            this.edgeBottomBox = new OpenNest.Controls.NumericUpDown();
+            this.sourceLabel = new System.Windows.Forms.Label();
             this.saveButton = new System.Windows.Forms.Button();
             this.cancelButton = new System.Windows.Forms.Button();
+            this.toolTip = new System.Windows.Forms.ToolTip(this.components);
             ((System.ComponentModel.ISupportInitialize)(this.widthBox)).BeginInit();
             ((System.ComponentModel.ISupportInitialize)(this.lengthBox)).BeginInit();
             ((System.ComponentModel.ISupportInitialize)(this.partSpacingBox)).BeginInit();
-            ((System.ComponentModel.ISupportInitialize)(this.edgeLeftBox)).BeginInit();
-            ((System.ComponentModel.ISupportInitialize)(this.edgeBottomBox)).BeginInit();
-            ((System.ComponentModel.ISupportInitialize)(this.edgeRightBox)).BeginInit();
             ((System.ComponentModel.ISupportInitialize)(this.edgeTopBox)).BeginInit();
-            this.tableLayoutPanel1.SuspendLayout();
+            ((System.ComponentModel.ISupportInitialize)(this.edgeLeftBox)).BeginInit();
+            ((System.ComponentModel.ISupportInitialize)(this.edgeRightBox)).BeginInit();
+            ((System.ComponentModel.ISupportInitialize)(this.edgeBottomBox)).BeginInit();
+            this.generalGroup.SuspendLayout();
+            this.plateGroup.SuspendLayout();
+            this.quadrantGroup.SuspendLayout();
+            this.spacingGroup.SuspendLayout();
             this.SuspendLayout();
             //
-            // tableLayoutPanel1
+            // generalGroup
             //
-            this.tableLayoutPanel1.ColumnCount = 2;
-            this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
-            this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
-            this.tableLayoutPanel1.Controls.Add(this.unitsLabel, 0, 0);
-            this.tableLayoutPanel1.Controls.Add(this.unitsCombo, 1, 0);
-            this.tableLayoutPanel1.Controls.Add(this.widthLabel, 0, 1);
-            this.tableLayoutPanel1.Controls.Add(this.widthBox, 1, 1);
-            this.tableLayoutPanel1.Controls.Add(this.lengthLabel, 0, 2);
-            this.tableLayoutPanel1.Controls.Add(this.lengthBox, 1, 2);
-            this.tableLayoutPanel1.Controls.Add(this.partSpacingLabel, 0, 3);
-            this.tableLayoutPanel1.Controls.Add(this.partSpacingBox, 1, 3);
-            this.tableLayoutPanel1.Controls.Add(this.edgeLeftLabel, 0, 4);
-            this.tableLayoutPanel1.Controls.Add(this.edgeLeftBox, 1, 4);
-            this.tableLayoutPanel1.Controls.Add(this.edgeBottomLabel, 0, 5);
-            this.tableLayoutPanel1.Controls.Add(this.edgeBottomBox, 1, 5);
-            this.tableLayoutPanel1.Controls.Add(this.edgeRightLabel, 0, 6);
-            this.tableLayoutPanel1.Controls.Add(this.edgeRightBox, 1, 6);
-            this.tableLayoutPanel1.Controls.Add(this.edgeTopLabel, 0, 7);
-            this.tableLayoutPanel1.Controls.Add(this.edgeTopBox, 1, 7);
-            this.tableLayoutPanel1.Controls.Add(this.quadrantLabel, 0, 8);
-            this.tableLayoutPanel1.Controls.Add(this.quadrantSelect1, 1, 8);
-            this.tableLayoutPanel1.Controls.Add(this.machineLabel, 0, 9);
-            this.tableLayoutPanel1.Controls.Add(this.machineCombo, 1, 9);
-            this.tableLayoutPanel1.Location = new System.Drawing.Point(12, 12);
-            this.tableLayoutPanel1.Name = "tableLayoutPanel1";
-            this.tableLayoutPanel1.RowCount = 10;
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 10F));
-            this.tableLayoutPanel1.Size = new System.Drawing.Size(410, 288);
-            this.tableLayoutPanel1.TabIndex = 0;
-            //
-            // unitsLabel
-            //
-            this.unitsLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.unitsLabel.AutoSize = true;
-            this.unitsLabel.Location = new System.Drawing.Point(3, 9);
-            this.unitsLabel.Name = "unitsLabel";
-            this.unitsLabel.Size = new System.Drawing.Size(100, 16);
-            this.unitsLabel.TabIndex = 0;
-            this.unitsLabel.Text = "Units:";
-            //
-            // unitsCombo
-            //
-            this.unitsCombo.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.unitsCombo.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
-            this.unitsCombo.Items.AddRange(new object[] { "Inches", "Millimeters" });
-            this.unitsCombo.Location = new System.Drawing.Point(109, 5);
-            this.unitsCombo.Name = "unitsCombo";
-            this.unitsCombo.Size = new System.Drawing.Size(298, 24);
-            this.unitsCombo.TabIndex = 1;
-            //
-            // widthLabel
-            //
-            this.widthLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.widthLabel.AutoSize = true;
-            this.widthLabel.Location = new System.Drawing.Point(3, 37);
-            this.widthLabel.Name = "widthLabel";
-            this.widthLabel.Size = new System.Drawing.Size(100, 16);
-            this.widthLabel.TabIndex = 2;
-            this.widthLabel.Text = "Plate width:";
-            //
-            // widthBox
-            //
-            this.widthBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.widthBox.DecimalPlaces = 4;
-            this.widthBox.Location = new System.Drawing.Point(109, 33);
-            this.widthBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.widthBox.Minimum = new decimal(new int[] { 1, 0, 0, 196608 });
-            this.widthBox.Name = "widthBox";
-            this.widthBox.Size = new System.Drawing.Size(298, 22);
-            this.widthBox.Suffix = "";
-            this.widthBox.TabIndex = 3;
-            //
-            // lengthLabel
-            //
-            this.lengthLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.lengthLabel.AutoSize = true;
-            this.lengthLabel.Location = new System.Drawing.Point(3, 65);
-            this.lengthLabel.Name = "lengthLabel";
-            this.lengthLabel.Size = new System.Drawing.Size(100, 16);
-            this.lengthLabel.TabIndex = 4;
-            this.lengthLabel.Text = "Plate length:";
-            //
-            // lengthBox
-            //
-            this.lengthBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.lengthBox.DecimalPlaces = 4;
-            this.lengthBox.Location = new System.Drawing.Point(109, 61);
-            this.lengthBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.lengthBox.Minimum = new decimal(new int[] { 1, 0, 0, 196608 });
-            this.lengthBox.Name = "lengthBox";
-            this.lengthBox.Size = new System.Drawing.Size(298, 22);
-            this.lengthBox.Suffix = "";
-            this.lengthBox.TabIndex = 5;
-            //
-            // partSpacingLabel
-            //
-            this.partSpacingLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.partSpacingLabel.AutoSize = true;
-            this.partSpacingLabel.Location = new System.Drawing.Point(3, 93);
-            this.partSpacingLabel.Name = "partSpacingLabel";
-            this.partSpacingLabel.Size = new System.Drawing.Size(100, 16);
-            this.partSpacingLabel.TabIndex = 6;
-            this.partSpacingLabel.Text = "Part spacing:";
-            //
-            // partSpacingBox
-            //
-            this.partSpacingBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.partSpacingBox.DecimalPlaces = 4;
-            this.partSpacingBox.Location = new System.Drawing.Point(109, 89);
-            this.partSpacingBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.partSpacingBox.Name = "partSpacingBox";
-            this.partSpacingBox.Size = new System.Drawing.Size(298, 22);
-            this.partSpacingBox.Suffix = "";
-            this.partSpacingBox.TabIndex = 7;
-            //
-            // edgeLeftLabel
-            //
-            this.edgeLeftLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeLeftLabel.AutoSize = true;
-            this.edgeLeftLabel.Location = new System.Drawing.Point(3, 121);
-            this.edgeLeftLabel.Name = "edgeLeftLabel";
-            this.edgeLeftLabel.Size = new System.Drawing.Size(100, 16);
-            this.edgeLeftLabel.TabIndex = 8;
-            this.edgeLeftLabel.Text = "Edge left:";
-            //
-            // edgeLeftBox
-            //
-            this.edgeLeftBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeLeftBox.DecimalPlaces = 4;
-            this.edgeLeftBox.Location = new System.Drawing.Point(109, 117);
-            this.edgeLeftBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.edgeLeftBox.Name = "edgeLeftBox";
-            this.edgeLeftBox.Size = new System.Drawing.Size(298, 22);
-            this.edgeLeftBox.Suffix = "";
-            this.edgeLeftBox.TabIndex = 9;
-            //
-            // edgeBottomLabel
-            //
-            this.edgeBottomLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeBottomLabel.AutoSize = true;
-            this.edgeBottomLabel.Location = new System.Drawing.Point(3, 149);
-            this.edgeBottomLabel.Name = "edgeBottomLabel";
-            this.edgeBottomLabel.Size = new System.Drawing.Size(100, 16);
-            this.edgeBottomLabel.TabIndex = 10;
-            this.edgeBottomLabel.Text = "Edge bottom:";
-            //
-            // edgeBottomBox
-            //
-            this.edgeBottomBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeBottomBox.DecimalPlaces = 4;
-            this.edgeBottomBox.Location = new System.Drawing.Point(109, 145);
-            this.edgeBottomBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.edgeBottomBox.Name = "edgeBottomBox";
-            this.edgeBottomBox.Size = new System.Drawing.Size(298, 22);
-            this.edgeBottomBox.Suffix = "";
-            this.edgeBottomBox.TabIndex = 11;
-            //
-            // edgeRightLabel
-            //
-            this.edgeRightLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeRightLabel.AutoSize = true;
-            this.edgeRightLabel.Location = new System.Drawing.Point(3, 177);
-            this.edgeRightLabel.Name = "edgeRightLabel";
-            this.edgeRightLabel.Size = new System.Drawing.Size(100, 16);
-            this.edgeRightLabel.TabIndex = 12;
-            this.edgeRightLabel.Text = "Edge right:";
-            //
-            // edgeRightBox
-            //
-            this.edgeRightBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeRightBox.DecimalPlaces = 4;
-            this.edgeRightBox.Location = new System.Drawing.Point(109, 173);
-            this.edgeRightBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.edgeRightBox.Name = "edgeRightBox";
-            this.edgeRightBox.Size = new System.Drawing.Size(298, 22);
-            this.edgeRightBox.Suffix = "";
-            this.edgeRightBox.TabIndex = 13;
-            //
-            // edgeTopLabel
-            //
-            this.edgeTopLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeTopLabel.AutoSize = true;
-            this.edgeTopLabel.Location = new System.Drawing.Point(3, 205);
-            this.edgeTopLabel.Name = "edgeTopLabel";
-            this.edgeTopLabel.Size = new System.Drawing.Size(100, 16);
-            this.edgeTopLabel.TabIndex = 14;
-            this.edgeTopLabel.Text = "Edge top:";
-            //
-            // edgeTopBox
-            //
-            this.edgeTopBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.edgeTopBox.DecimalPlaces = 4;
-            this.edgeTopBox.Location = new System.Drawing.Point(109, 201);
-            this.edgeTopBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
-            this.edgeTopBox.Name = "edgeTopBox";
-            this.edgeTopBox.Size = new System.Drawing.Size(298, 22);
-            this.edgeTopBox.Suffix = "";
-            this.edgeTopBox.TabIndex = 15;
-            //
-            // quadrantLabel
-            //
-            this.quadrantLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
-            this.quadrantLabel.AutoSize = true;
-            this.quadrantLabel.Location = new System.Drawing.Point(3, 233);
-            this.quadrantLabel.Name = "quadrantLabel";
-            this.quadrantLabel.Size = new System.Drawing.Size(100, 16);
-            this.quadrantLabel.TabIndex = 16;
-            this.quadrantLabel.Text = "Quadrant:";
-            //
-            // quadrantSelect1
-            //
-            this.quadrantSelect1.Anchor = System.Windows.Forms.AnchorStyles.None;
-            this.quadrantSelect1.BackColor = System.Drawing.Color.White;
-            this.quadrantSelect1.Location = new System.Drawing.Point(198, 225);
-            this.quadrantSelect1.Name = "quadrantSelect1";
-            this.quadrantSelect1.Quadrant = 1;
-            this.quadrantSelect1.Size = new System.Drawing.Size(120, 28);
-            this.quadrantSelect1.TabIndex = 17;
+            this.generalGroup.Controls.Add(this.machineLabel);
+            this.generalGroup.Controls.Add(this.machineCombo);
+            this.generalGroup.Controls.Add(this.unitsLabel);
+            this.generalGroup.Controls.Add(this.inchesRadio);
+            this.generalGroup.Controls.Add(this.millimetersRadio);
+            this.generalGroup.Location = new System.Drawing.Point(12, 12);
+            this.generalGroup.Name = "generalGroup";
+            this.generalGroup.Size = new System.Drawing.Size(340, 90);
+            this.generalGroup.TabIndex = 0;
+            this.generalGroup.TabStop = false;
+            this.generalGroup.Text = "General";
             //
             // machineLabel
             //
-            this.machineLabel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
             this.machineLabel.AutoSize = true;
-            this.machineLabel.Location = new System.Drawing.Point(3, 263);
+            this.machineLabel.Location = new System.Drawing.Point(12, 27);
             this.machineLabel.Name = "machineLabel";
-            this.machineLabel.Size = new System.Drawing.Size(100, 16);
-            this.machineLabel.TabIndex = 18;
+            this.machineLabel.Size = new System.Drawing.Size(56, 15);
+            this.machineLabel.TabIndex = 0;
             this.machineLabel.Text = "Machine:";
             //
             // machineCombo
             //
-            this.machineCombo.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
             this.machineCombo.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
-            this.machineCombo.Location = new System.Drawing.Point(109, 259);
+            this.machineCombo.Location = new System.Drawing.Point(90, 23);
             this.machineCombo.Name = "machineCombo";
-            this.machineCombo.Size = new System.Drawing.Size(298, 24);
-            this.machineCombo.TabIndex = 19;
+            this.machineCombo.Size = new System.Drawing.Size(236, 23);
+            this.machineCombo.TabIndex = 1;
+            //
+            // unitsLabel
+            //
+            this.unitsLabel.AutoSize = true;
+            this.unitsLabel.Location = new System.Drawing.Point(12, 59);
+            this.unitsLabel.Name = "unitsLabel";
+            this.unitsLabel.Size = new System.Drawing.Size(37, 15);
+            this.unitsLabel.TabIndex = 2;
+            this.unitsLabel.Text = "Units:";
+            //
+            // inchesRadio
+            //
+            this.inchesRadio.AutoSize = true;
+            this.inchesRadio.Location = new System.Drawing.Point(90, 57);
+            this.inchesRadio.Name = "inchesRadio";
+            this.inchesRadio.Size = new System.Drawing.Size(61, 19);
+            this.inchesRadio.TabIndex = 3;
+            this.inchesRadio.TabStop = true;
+            this.inchesRadio.Text = "Inches";
+            this.inchesRadio.UseVisualStyleBackColor = true;
+            //
+            // millimetersRadio
+            //
+            this.millimetersRadio.AutoSize = true;
+            this.millimetersRadio.Location = new System.Drawing.Point(170, 57);
+            this.millimetersRadio.Name = "millimetersRadio";
+            this.millimetersRadio.Size = new System.Drawing.Size(85, 19);
+            this.millimetersRadio.TabIndex = 4;
+            this.millimetersRadio.Text = "Millimeters";
+            this.millimetersRadio.UseVisualStyleBackColor = true;
+            this.millimetersRadio.CheckedChanged += new System.EventHandler(this.UnitsChanged);
+            //
+            // plateGroup
+            //
+            this.plateGroup.Controls.Add(this.widthLabel);
+            this.plateGroup.Controls.Add(this.widthBox);
+            this.plateGroup.Controls.Add(this.lengthLabel);
+            this.plateGroup.Controls.Add(this.lengthBox);
+            this.plateGroup.Location = new System.Drawing.Point(12, 110);
+            this.plateGroup.Name = "plateGroup";
+            this.plateGroup.Size = new System.Drawing.Size(340, 90);
+            this.plateGroup.TabIndex = 1;
+            this.plateGroup.TabStop = false;
+            this.plateGroup.Text = "Plate Size";
+            //
+            // widthLabel
+            //
+            this.widthLabel.AutoSize = true;
+            this.widthLabel.Location = new System.Drawing.Point(12, 27);
+            this.widthLabel.Name = "widthLabel";
+            this.widthLabel.Size = new System.Drawing.Size(42, 15);
+            this.widthLabel.TabIndex = 0;
+            this.widthLabel.Text = "Width:";
+            //
+            // widthBox
+            //
+            this.widthBox.DecimalPlaces = 4;
+            this.widthBox.Location = new System.Drawing.Point(90, 24);
+            this.widthBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.widthBox.Minimum = new decimal(new int[] { 1, 0, 0, 196608 });
+            this.widthBox.Name = "widthBox";
+            this.widthBox.Size = new System.Drawing.Size(130, 23);
+            this.widthBox.Suffix = "";
+            this.widthBox.TabIndex = 1;
+            //
+            // lengthLabel
+            //
+            this.lengthLabel.AutoSize = true;
+            this.lengthLabel.Location = new System.Drawing.Point(12, 59);
+            this.lengthLabel.Name = "lengthLabel";
+            this.lengthLabel.Size = new System.Drawing.Size(47, 15);
+            this.lengthLabel.TabIndex = 2;
+            this.lengthLabel.Text = "Length:";
+            //
+            // lengthBox
+            //
+            this.lengthBox.DecimalPlaces = 4;
+            this.lengthBox.Location = new System.Drawing.Point(90, 56);
+            this.lengthBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.lengthBox.Minimum = new decimal(new int[] { 1, 0, 0, 196608 });
+            this.lengthBox.Name = "lengthBox";
+            this.lengthBox.Size = new System.Drawing.Size(130, 23);
+            this.lengthBox.Suffix = "";
+            this.lengthBox.TabIndex = 3;
+            //
+            // quadrantGroup
+            //
+            this.quadrantGroup.Controls.Add(this.quadrantSelect1);
+            this.quadrantGroup.Controls.Add(this.quadrantHintLabel);
+            this.quadrantGroup.Location = new System.Drawing.Point(364, 12);
+            this.quadrantGroup.Name = "quadrantGroup";
+            this.quadrantGroup.Size = new System.Drawing.Size(224, 188);
+            this.quadrantGroup.TabIndex = 2;
+            this.quadrantGroup.TabStop = false;
+            this.quadrantGroup.Text = "Quadrant";
+            //
+            // quadrantSelect1
+            //
+            this.quadrantSelect1.BackColor = System.Drawing.Color.White;
+            this.quadrantSelect1.Cursor = System.Windows.Forms.Cursors.Hand;
+            this.quadrantSelect1.Location = new System.Drawing.Point(12, 24);
+            this.quadrantSelect1.Name = "quadrantSelect1";
+            this.quadrantSelect1.Quadrant = 1;
+            this.quadrantSelect1.Size = new System.Drawing.Size(200, 126);
+            this.quadrantSelect1.TabIndex = 0;
+            //
+            // quadrantHintLabel
+            //
+            this.quadrantHintLabel.ForeColor = System.Drawing.SystemColors.GrayText;
+            this.quadrantHintLabel.Location = new System.Drawing.Point(12, 156);
+            this.quadrantHintLabel.Name = "quadrantHintLabel";
+            this.quadrantHintLabel.Size = new System.Drawing.Size(200, 20);
+            this.quadrantHintLabel.TabIndex = 1;
+            this.quadrantHintLabel.Text = "Click a quadrant to select it.";
+            this.quadrantHintLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
+            //
+            // spacingGroup
+            //
+            this.spacingGroup.Controls.Add(this.partSpacingLabel);
+            this.spacingGroup.Controls.Add(this.partSpacingBox);
+            this.spacingGroup.Controls.Add(this.edgeSpacingLabel);
+            this.spacingGroup.Controls.Add(this.edgeTopBox);
+            this.spacingGroup.Controls.Add(this.edgeLeftBox);
+            this.spacingGroup.Controls.Add(this.edgePlateLabel);
+            this.spacingGroup.Controls.Add(this.edgeRightBox);
+            this.spacingGroup.Controls.Add(this.edgeBottomBox);
+            this.spacingGroup.Location = new System.Drawing.Point(12, 208);
+            this.spacingGroup.Name = "spacingGroup";
+            this.spacingGroup.Size = new System.Drawing.Size(576, 136);
+            this.spacingGroup.TabIndex = 3;
+            this.spacingGroup.TabStop = false;
+            this.spacingGroup.Text = "Spacing";
+            //
+            // partSpacingLabel
+            //
+            this.partSpacingLabel.AutoSize = true;
+            this.partSpacingLabel.Location = new System.Drawing.Point(12, 30);
+            this.partSpacingLabel.Name = "partSpacingLabel";
+            this.partSpacingLabel.Size = new System.Drawing.Size(77, 15);
+            this.partSpacingLabel.TabIndex = 0;
+            this.partSpacingLabel.Text = "Between parts:";
+            //
+            // partSpacingBox
+            //
+            this.partSpacingBox.DecimalPlaces = 4;
+            this.partSpacingBox.Location = new System.Drawing.Point(12, 50);
+            this.partSpacingBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.partSpacingBox.Name = "partSpacingBox";
+            this.partSpacingBox.Size = new System.Drawing.Size(130, 23);
+            this.partSpacingBox.Suffix = "";
+            this.partSpacingBox.TabIndex = 1;
+            //
+            // edgeSpacingLabel
+            //
+            this.edgeSpacingLabel.AutoSize = true;
+            this.edgeSpacingLabel.Location = new System.Drawing.Point(178, 30);
+            this.edgeSpacingLabel.Name = "edgeSpacingLabel";
+            this.edgeSpacingLabel.Size = new System.Drawing.Size(67, 15);
+            this.edgeSpacingLabel.TabIndex = 2;
+            this.edgeSpacingLabel.Text = "Plate edges:";
+            //
+            // edgeTopBox
+            //
+            this.edgeTopBox.DecimalPlaces = 4;
+            this.edgeTopBox.Location = new System.Drawing.Point(355, 22);
+            this.edgeTopBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.edgeTopBox.Name = "edgeTopBox";
+            this.edgeTopBox.Size = new System.Drawing.Size(100, 23);
+            this.edgeTopBox.Suffix = "";
+            this.edgeTopBox.TabIndex = 3;
+            this.toolTip.SetToolTip(this.edgeTopBox, "Top edge spacing");
+            //
+            // edgeLeftBox
+            //
+            this.edgeLeftBox.DecimalPlaces = 4;
+            this.edgeLeftBox.Location = new System.Drawing.Point(250, 61);
+            this.edgeLeftBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.edgeLeftBox.Name = "edgeLeftBox";
+            this.edgeLeftBox.Size = new System.Drawing.Size(100, 23);
+            this.edgeLeftBox.Suffix = "";
+            this.edgeLeftBox.TabIndex = 4;
+            this.toolTip.SetToolTip(this.edgeLeftBox, "Left edge spacing");
+            //
+            // edgePlateLabel
+            //
+            this.edgePlateLabel.BackColor = System.Drawing.Color.AliceBlue;
+            this.edgePlateLabel.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
+            this.edgePlateLabel.ForeColor = System.Drawing.SystemColors.GrayText;
+            this.edgePlateLabel.Location = new System.Drawing.Point(358, 50);
+            this.edgePlateLabel.Name = "edgePlateLabel";
+            this.edgePlateLabel.Size = new System.Drawing.Size(94, 45);
+            this.edgePlateLabel.TabIndex = 5;
+            this.edgePlateLabel.Text = "Plate";
+            this.edgePlateLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
+            //
+            // edgeRightBox
+            //
+            this.edgeRightBox.DecimalPlaces = 4;
+            this.edgeRightBox.Location = new System.Drawing.Point(460, 61);
+            this.edgeRightBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.edgeRightBox.Name = "edgeRightBox";
+            this.edgeRightBox.Size = new System.Drawing.Size(100, 23);
+            this.edgeRightBox.Suffix = "";
+            this.edgeRightBox.TabIndex = 6;
+            this.toolTip.SetToolTip(this.edgeRightBox, "Right edge spacing");
+            //
+            // edgeBottomBox
+            //
+            this.edgeBottomBox.DecimalPlaces = 4;
+            this.edgeBottomBox.Location = new System.Drawing.Point(355, 100);
+            this.edgeBottomBox.Maximum = new decimal(new int[] { 1000000, 0, 0, 0 });
+            this.edgeBottomBox.Name = "edgeBottomBox";
+            this.edgeBottomBox.Size = new System.Drawing.Size(100, 23);
+            this.edgeBottomBox.Suffix = "";
+            this.edgeBottomBox.TabIndex = 7;
+            this.toolTip.SetToolTip(this.edgeBottomBox, "Bottom edge spacing");
+            //
+            // sourceLabel
+            //
+            this.sourceLabel.ForeColor = System.Drawing.SystemColors.GrayText;
+            this.sourceLabel.Location = new System.Drawing.Point(12, 356);
+            this.sourceLabel.Name = "sourceLabel";
+            this.sourceLabel.Size = new System.Drawing.Size(380, 28);
+            this.sourceLabel.TabIndex = 4;
+            this.sourceLabel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
             //
             // saveButton
             //
-            this.saveButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
             this.saveButton.DialogResult = System.Windows.Forms.DialogResult.OK;
-            this.saveButton.Location = new System.Drawing.Point(243, 313);
+            this.saveButton.Location = new System.Drawing.Point(402, 356);
             this.saveButton.Name = "saveButton";
             this.saveButton.Size = new System.Drawing.Size(90, 28);
-            this.saveButton.TabIndex = 1;
+            this.saveButton.TabIndex = 5;
             this.saveButton.Text = "Save";
             this.saveButton.UseVisualStyleBackColor = true;
             //
             // cancelButton
             //
-            this.cancelButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
             this.cancelButton.DialogResult = System.Windows.Forms.DialogResult.Cancel;
-            this.cancelButton.Location = new System.Drawing.Point(339, 313);
+            this.cancelButton.Location = new System.Drawing.Point(498, 356);
             this.cancelButton.Name = "cancelButton";
             this.cancelButton.Size = new System.Drawing.Size(90, 28);
-            this.cancelButton.TabIndex = 2;
+            this.cancelButton.TabIndex = 6;
             this.cancelButton.Text = "Cancel";
             this.cancelButton.UseVisualStyleBackColor = true;
             //
@@ -337,8 +350,12 @@ namespace OpenNest.Forms
             this.AcceptButton = this.saveButton;
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
             this.CancelButton = this.cancelButton;
-            this.ClientSize = new System.Drawing.Size(434, 350);
-            this.Controls.Add(this.tableLayoutPanel1);
+            this.ClientSize = new System.Drawing.Size(600, 396);
+            this.Controls.Add(this.generalGroup);
+            this.Controls.Add(this.plateGroup);
+            this.Controls.Add(this.quadrantGroup);
+            this.Controls.Add(this.spacingGroup);
+            this.Controls.Add(this.sourceLabel);
             this.Controls.Add(this.saveButton);
             this.Controls.Add(this.cancelButton);
             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
@@ -352,39 +369,48 @@ namespace OpenNest.Forms
             ((System.ComponentModel.ISupportInitialize)(this.widthBox)).EndInit();
             ((System.ComponentModel.ISupportInitialize)(this.lengthBox)).EndInit();
             ((System.ComponentModel.ISupportInitialize)(this.partSpacingBox)).EndInit();
-            ((System.ComponentModel.ISupportInitialize)(this.edgeLeftBox)).EndInit();
-            ((System.ComponentModel.ISupportInitialize)(this.edgeBottomBox)).EndInit();
-            ((System.ComponentModel.ISupportInitialize)(this.edgeRightBox)).EndInit();
             ((System.ComponentModel.ISupportInitialize)(this.edgeTopBox)).EndInit();
-            this.tableLayoutPanel1.ResumeLayout(false);
-            this.tableLayoutPanel1.PerformLayout();
+            ((System.ComponentModel.ISupportInitialize)(this.edgeLeftBox)).EndInit();
+            ((System.ComponentModel.ISupportInitialize)(this.edgeRightBox)).EndInit();
+            ((System.ComponentModel.ISupportInitialize)(this.edgeBottomBox)).EndInit();
+            this.generalGroup.ResumeLayout(false);
+            this.generalGroup.PerformLayout();
+            this.plateGroup.ResumeLayout(false);
+            this.plateGroup.PerformLayout();
+            this.quadrantGroup.ResumeLayout(false);
+            this.spacingGroup.ResumeLayout(false);
+            this.spacingGroup.PerformLayout();
             this.ResumeLayout(false);
         }
 
         #endregion
 
-        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
+        private System.Windows.Forms.GroupBox generalGroup;
+        private System.Windows.Forms.Label machineLabel;
+        private System.Windows.Forms.ComboBox machineCombo;
         private System.Windows.Forms.Label unitsLabel;
-        private System.Windows.Forms.ComboBox unitsCombo;
+        private System.Windows.Forms.RadioButton inchesRadio;
+        private System.Windows.Forms.RadioButton millimetersRadio;
+        private System.Windows.Forms.GroupBox plateGroup;
         private System.Windows.Forms.Label widthLabel;
         private OpenNest.Controls.NumericUpDown widthBox;
         private System.Windows.Forms.Label lengthLabel;
         private OpenNest.Controls.NumericUpDown lengthBox;
+        private System.Windows.Forms.GroupBox quadrantGroup;
+        private OpenNest.Controls.QuadrantSelect quadrantSelect1;
+        private System.Windows.Forms.Label quadrantHintLabel;
+        private System.Windows.Forms.GroupBox spacingGroup;
         private System.Windows.Forms.Label partSpacingLabel;
         private OpenNest.Controls.NumericUpDown partSpacingBox;
-        private System.Windows.Forms.Label edgeLeftLabel;
-        private OpenNest.Controls.NumericUpDown edgeLeftBox;
-        private System.Windows.Forms.Label edgeBottomLabel;
-        private OpenNest.Controls.NumericUpDown edgeBottomBox;
-        private System.Windows.Forms.Label edgeRightLabel;
-        private OpenNest.Controls.NumericUpDown edgeRightBox;
-        private System.Windows.Forms.Label edgeTopLabel;
+        private System.Windows.Forms.Label edgeSpacingLabel;
         private OpenNest.Controls.NumericUpDown edgeTopBox;
-        private System.Windows.Forms.Label quadrantLabel;
-        private OpenNest.Controls.QuadrantSelect quadrantSelect1;
-        private System.Windows.Forms.Label machineLabel;
-        private System.Windows.Forms.ComboBox machineCombo;
+        private OpenNest.Controls.NumericUpDown edgeLeftBox;
+        private System.Windows.Forms.Label edgePlateLabel;
+        private OpenNest.Controls.NumericUpDown edgeRightBox;
+        private OpenNest.Controls.NumericUpDown edgeBottomBox;
+        private System.Windows.Forms.Label sourceLabel;
         private System.Windows.Forms.Button saveButton;
         private System.Windows.Forms.Button cancelButton;
+        private System.Windows.Forms.ToolTip toolTip;
     }
 }
diff --git a/OpenNest/Forms/NestDefaultsForm.cs b/OpenNest/Forms/NestDefaultsForm.cs
index cd904e24..8bc2dae3 100644
--- a/OpenNest/Forms/NestDefaultsForm.cs
+++ b/OpenNest/Forms/NestDefaultsForm.cs
@@ -19,9 +19,11 @@ namespace OpenNest.Forms
         }
 
         private readonly Guid? savedMachineId;
+        private Units shownUnits;
 
         /// <param name="machines">The machines new nests can be assigned.</param>
-        public NestDefaultsForm(NestDefaults defaults, IEnumerable<MachineConfig> machines)
+        /// <param name="source">Where the defaults are saved, and whether they can be saved there now.</param>
+        public NestDefaultsForm(NestDefaults defaults, IEnumerable<MachineConfig> machines, (string Text, bool ReadOnly) source)
         {
             InitializeComponent();
 
@@ -33,24 +35,25 @@ namespace OpenNest.Forms
             machineCombo.SelectedItem = machineCombo.Items.Cast<MachineChoice>().FirstOrDefault(c => c.Machine == selected);
             machineCombo.Enabled = machineCombo.Items.Count > 0;
 
-            unitsCombo.SelectedIndex = defaults.Units == Units.Millimeters ? 1 : 0;
-            widthBox.Value = Clamp(widthBox, defaults.Size.Width);
-            lengthBox.Value = Clamp(lengthBox, defaults.Size.Length);
-            partSpacingBox.Value = Clamp(partSpacingBox, defaults.PartSpacing);
-            edgeLeftBox.Value = Clamp(edgeLeftBox, defaults.EdgeSpacing.Left);
-            edgeBottomBox.Value = Clamp(edgeBottomBox, defaults.EdgeSpacing.Bottom);
-            edgeRightBox.Value = Clamp(edgeRightBox, defaults.EdgeSpacing.Right);
-            edgeTopBox.Value = Clamp(edgeTopBox, defaults.EdgeSpacing.Top);
-            quadrantSelect1.Quadrant = defaults.Quadrant;
+            shownUnits = defaults.Units;
+            (defaults.Units == Units.Millimeters ? millimetersRadio : inchesRadio).Checked = true;
+            ShowValues(defaults);
+
+            sourceLabel.Text = source.Text;
+            saveButton.Enabled = !source.ReadOnly;
         }
 
-        public Units Units => unitsCombo.SelectedIndex == 1 ? Units.Millimeters : Units.Inches;
+        private NestDefaultsForm() => InitializeComponent();
 
-        public NestDefaults GetDefaults()
+        public Units Units => millimetersRadio.Checked ? Units.Millimeters : Units.Inches;
+
+        public NestDefaults GetDefaults() => ReadValues(Units);
+
+        private NestDefaults ReadValues(Units units)
         {
             return new NestDefaults
             {
-                Units = Units,
+                Units = units,
                 Size = new Size((double)widthBox.Value, (double)lengthBox.Value),
                 Quadrant = quadrantSelect1.Quadrant,
                 PartSpacing = (double)partSpacingBox.Value,
@@ -65,6 +68,33 @@ namespace OpenNest.Forms
             };
         }
 
+        private void ShowValues(NestDefaults defaults)
+        {
+            widthBox.Value = Clamp(widthBox, defaults.Size.Width);
+            lengthBox.Value = Clamp(lengthBox, defaults.Size.Length);
+            partSpacingBox.Value = Clamp(partSpacingBox, defaults.PartSpacing);
+            edgeLeftBox.Value = Clamp(edgeLeftBox, defaults.EdgeSpacing.Left);
+            edgeBottomBox.Value = Clamp(edgeBottomBox, defaults.EdgeSpacing.Bottom);
+            edgeRightBox.Value = Clamp(edgeRightBox, defaults.EdgeSpacing.Right);
+            edgeTopBox.Value = Clamp(edgeTopBox, defaults.EdgeSpacing.Top);
+            quadrantSelect1.Quadrant = defaults.Quadrant;
+            quadrantSelect1.Invalidate();
+
+            var suffix = defaults.Units == Units.Millimeters ? "mm" : "in";
+            foreach (var box in new[] { widthBox, lengthBox, partSpacingBox, edgeLeftBox, edgeBottomBox, edgeRightBox, edgeTopBox })
+                box.Suffix = suffix;
+        }
+
+        /// <summary>Switching units converts the values shown, so a 48 in plate stays 1219.2 mm.</summary>
+        private void UnitsChanged(object sender, EventArgs e)
+        {
+            if (Units == shownUnits)
+                return;
+
+            ShowValues(ReadValues(shownUnits).ConvertedTo(Units));
+            shownUnits = Units;
+        }
+
         private static decimal Clamp(NumericUpDown box, double value)
         {
             if (double.IsNaN(value) || double.IsInfinity(value))
diff --git a/OpenNest/Forms/SharedSettings.cs b/OpenNest/Forms/SharedSettings.cs
index 726e1fc4..8d4505f1 100644
--- a/OpenNest/Forms/SharedSettings.cs
+++ b/OpenNest/Forms/SharedSettings.cs
@@ -112,6 +112,19 @@ namespace OpenNest.Forms
             return store?.IsOffline == true ? "shared, read-only: the server cannot be reached" : "shared on the nest server";
         }
 
+        /// <summary>
+        /// Where Tools > Nest Defaults saves (the server once it holds them, as
+        /// <see cref="MachineSettings.SaveNestDefaults"/> does) and whether it can save there now.
+        /// </summary>
+        public static (string Text, bool ReadOnly) NestDefaultsSource()
+        {
+            if (Find(SharedSettingKinds.NestDefaults, SharedSettingKinds.DefaultKey) == null)
+                return (Current() == null ? "Saved on this PC." : "Saved on this PC only: not shared on the server yet.", false);
+            return store?.IsOffline == true
+                ? ("Shared, read-only: the server cannot be reached.", true)
+                : ("Shared with every workstation on the nest server.", false);
+        }
+
         /// <summary>The key of a post's shared settings.</summary>
         public static string PostKey(IPostProcessor postProcessor) => postProcessor.GetType().FullName;
 
diff --git a/docs/shared-settings.md b/docs/shared-settings.md
index 699a6e5f..f303f10d 100644
--- a/docs/shared-settings.md
+++ b/docs/shared-settings.md
@@ -48,7 +48,8 @@ saved first the server refuses it and the desktop takes their copy:
 - Clamps, nest defaults, support grid: the save reports the conflict.
 
 The window title of Tools > Machine Configuration says whether it edits the shared machines,
-this PC's (not shared yet), or a read-only copy.
+this PC's (not shared yet), or a read-only copy. Tools > Nest Defaults says the same beside
+its buttons and disables Save while its shared copy is read-only.
 
 ## Server