diff --git a/MatterControl.Printing/Settings/PrinterSettings.cs b/MatterControl.Printing/Settings/PrinterSettings.cs
index ad3c54129..0fc9a9ec4 100644
--- a/MatterControl.Printing/Settings/PrinterSettings.cs
+++ b/MatterControl.Printing/Settings/PrinterSettings.cs
@@ -239,6 +239,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 			SettingsKey.unload_filament_length,
 			SettingsKey.use_z_probe,
 			SettingsKey.validate_leveling,
+			SettingsKey.validation_threshold,
 			SettingsKey.validate_layer_height,
 			SettingsKey.write_regex,
 			SettingsKey.xy_offsets_have_been_calibrated,
diff --git a/MatterControl.Printing/Settings/SettingsKey.cs b/MatterControl.Printing/Settings/SettingsKey.cs
index 57b1b3e15..25ade0b50 100644
--- a/MatterControl.Printing/Settings/SettingsKey.cs
+++ b/MatterControl.Printing/Settings/SettingsKey.cs
@@ -261,6 +261,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 		public const string use_z_probe = nameof(use_z_probe);
 		public const string validate_layer_height = nameof(validate_layer_height);
 		public const string validate_leveling = nameof(validate_leveling);
+		public const string validation_threshold = nameof(validation_threshold);
 		public const string vibration_limit = nameof(vibration_limit);
 		public const string windows_driver = nameof(windows_driver);
 		public const string wipe_shield_distance = nameof(wipe_shield_distance);
diff --git a/MatterControl.Printing/Settings/SliceSettingsFields.cs b/MatterControl.Printing/Settings/SliceSettingsFields.cs
index c5b108947..b28e40b48 100644
--- a/MatterControl.Printing/Settings/SliceSettingsFields.cs
+++ b/MatterControl.Printing/Settings/SliceSettingsFields.cs
@@ -526,7 +526,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					Units = "g/cm³".Localize(),
 					DefaultValue = "1.24",
 					RebuildGCodeOnChange = false,
-					QuickMenuSettings = { { "PLA", "1.24" }, { "PET", "1.27" }, { "ABS","1.04" } },
+					QuickMenuSettings = { { "PLA", "1.24" }, { "PET", "1.27" }, { "ABS", "1.04" } },
 				},
 				new SliceSettingData()
 				{
@@ -1039,9 +1039,22 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					ShowAsOverride = true,
 					ShowIfSet = "!has_hardware_leveling&has_z_probe&use_z_probe",
 					RebuildGCodeOnChange = false,
+					ReloadUiWhenChanged = true,
 					DefaultValue = "0"
 				},
 				new SliceSettingData()
+				{
+					SlicerConfigName = SettingsKey.validation_threshold,
+					PresentationName = "Validation Threshold".Localize(),
+					HelpText = "The deviation from the last measured value allowed without re-calculating the leveling solution.".Localize(),
+					DataEditType = DataEditTypes.POSITIVE_DOUBLE,
+					Units = "mm".Localize(),
+					ShowAsOverride = true,
+					ShowIfSet = "!sla_printer&!has_hardware_leveling&has_z_probe&use_z_probe&validate_leveling",
+					RebuildGCodeOnChange = false,
+					DefaultValue = ".05"
+				},
+				new SliceSettingData()
 				{
 					SlicerConfigName = SettingsKey.probe_offset,
 					PresentationName = "Probe Offset".Localize(),
@@ -1130,7 +1143,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 							{ "Value", "[current_value]" }
 						}
 					},
-						SlicerConfigName = SettingsKey.solid_shell,
+					SlicerConfigName = SettingsKey.solid_shell,
 					PresentationName = "Width".Localize(),
 					HelpText = "Sets the size of the outer solid surface (perimeter) for the entire print.".Localize(),
 					DataEditType = DataEditTypes.POSITIVE_DOUBLE,
@@ -2288,7 +2301,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 					DataEditType = DataEditTypes.CHECK_BOX,
 					SetSettingsOnChange = new List<Dictionary<string, string>>
 					{
-						new  Dictionary<string, string>
+						new Dictionary<string, string>
 						{
 							{ "TargetSetting", SettingsKey.driver_type },
 							{ "OnValue", "TCPIP" },
diff --git a/MatterControlLib/ApplicationView/SettingsValidation.cs b/MatterControlLib/ApplicationView/SettingsValidation.cs
index d2d6f3911..e3954aa93 100644
--- a/MatterControlLib/ApplicationView/SettingsValidation.cs
+++ b/MatterControlLib/ApplicationView/SettingsValidation.cs
@@ -264,6 +264,23 @@ namespace MatterHackers.MatterControl
 							});
 					}
 
+					if (levelingEnabled
+						&& !settings.GetValue<bool>(SettingsKey.has_hardware_leveling)
+						&& settings.GetValue<bool>(SettingsKey.has_z_probe)
+						&& settings.GetValue<bool>(SettingsKey.use_z_probe)
+						&& settings.GetValue<bool>(SettingsKey.validate_leveling)
+						&& (settings.GetValue<double>(SettingsKey.validation_threshold) < .001
+						|| settings.GetValue<double>(SettingsKey.validation_threshold) > .5))
+					{
+						var threshold = settings.GetValue<double>(SettingsKey.validation_threshold);
+						errors.Add(
+							new SettingsValidationError(SettingsKey.validation_threshold)
+							{
+								Error = "The Validation Threshold mush be greater than 0 and less than .5mm. It is currently {0}.".Localize().FormatWith(threshold),
+								ValueDetails = "{0} = {1}".FormatWith(GetSettingsName(SettingsKey.validation_threshold), threshold),
+							});
+					}
+
 					// check if the leveling data has too large a range
 					if (printer.Settings.Helpers.PrintLevelingData.SampledPositions.Count > 3)
 					{
diff --git a/MatterControlLib/PrinterCommunication/Io/ValidatePrintLevelingStream.cs b/MatterControlLib/PrinterCommunication/Io/ValidatePrintLevelingStream.cs
index ee2c8871d..47e6494f3 100644
--- a/MatterControlLib/PrinterCommunication/Io/ValidatePrintLevelingStream.cs
+++ b/MatterControlLib/PrinterCommunication/Io/ValidatePrintLevelingStream.cs
@@ -231,7 +231,7 @@ namespace MatterHackers.MatterControl.PrinterCommunication.Io
 
 							var delta = sampledPositions[activeProbeIndex].Position.Z - levelingData.SampledPositions[activeProbeIndex].Z;
 							if (levelingData.SampledPositions.Count == sampledPositions.Count
-								&& Math.Abs(delta) < printer.Settings.GetValue<double>(SettingsKey.nozzle_diameter) / 10.0)
+								&& Math.Abs(delta) < printer.Settings.GetValue<double>(SettingsKey.validation_threshold))
 							{
 								// the last leveling is still good abort this new calibration and start printing
 								CancelValidation();
diff --git a/StaticData/SliceSettings/Layouts.txt b/StaticData/SliceSettings/Layouts.txt
index 27c86f9e6..efc74d5b9 100644
--- a/StaticData/SliceSettings/Layouts.txt
+++ b/StaticData/SliceSettings/Layouts.txt
@@ -154,6 +154,7 @@ Printer
       print_leveling_probe_start
       use_z_probe
       validate_leveling
+      validation_threshold
       z_probe_samples
       probe_offset
       z_servo_depolyed_angle