diff --git a/src/ACadSharp/Entities/Solid3D.cs b/src/ACadSharp/Entities/Solid3D.cs
index 727e89ba..13e02405 100644
--- a/src/ACadSharp/Entities/Solid3D.cs
+++ b/src/ACadSharp/Entities/Solid3D.cs
@@ -1,10 +1,12 @@
 using ACadSharp.Attributes;
+using System.Reflection;
+using System;
 using CSMath;
 
 namespace ACadSharp.Entities
 {
 	/// <summary>
-	/// Represents a <see cref="Solid"/> entity.
+	/// Represents a <see cref="Solid3D"/> entity.
 	/// </summary>
 	/// <remarks>
 	/// Object name <see cref="DxfFileToken.Entity3DSolid"/> <br/>
@@ -28,5 +30,9 @@ public override BoundingBox GetBoundingBox()
 		{
 			return BoundingBox.Null;
 		}
+
+		//70	Modeler format version number(currently = 1)
+		//1	Proprietary data(multiple lines < 255 characters each)
+		//3	Additional lines of proprietary data(if previous group 1 string is greater than 255 characters) (optional)
 	}
 }
diff --git a/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Entities.cs b/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Entities.cs
index e9fe7b3c..3b1590c6 100644
--- a/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Entities.cs
+++ b/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Entities.cs
@@ -19,7 +19,6 @@ private void writeEntity(Entity entity)
 			{
 				case UnknownEntity:
 				case AttributeEntity:
-				case Solid3D:
 				case Mesh:
 					this.notify($"Entity type not implemented {entity.GetType().FullName}", NotificationType.NotImplemented);
 					return;