diff --git a/OpenNest.Engine/ML/AnglePredictor.cs b/OpenNest.Engine/ML/AnglePredictor.cs
index 3f2386c..da864a8 100644
--- a/OpenNest.Engine/ML/AnglePredictor.cs
+++ b/OpenNest.Engine/ML/AnglePredictor.cs
@@ -12,7 +12,7 @@ namespace OpenNest.Engine.ML
     public static class AnglePredictor
     {
         private static InferenceSession _session;
-        private static bool _loadAttempted;
+        private static volatile bool _loadAttempted;
         private static readonly object _lock = new();
 
         public static List<double> PredictAngles(
diff --git a/OpenNest.Engine/OpenNest.Engine.csproj b/OpenNest.Engine/OpenNest.Engine.csproj
index a4b3e98..bcf6d9e 100644
--- a/OpenNest.Engine/OpenNest.Engine.csproj
+++ b/OpenNest.Engine/OpenNest.Engine.csproj
@@ -10,4 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.ML.OnnxRuntime" Version="1.17.3" />
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="Models\**" CopyToOutputDirectory="PreserveNewest" Condition="Exists('Models')" />
+  </ItemGroup>
 </Project>