diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index 7e24f231..07ccc2cc 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -642,6 +642,25 @@
           "direction"
         ]
       },
+      "BodyType": {
+        "description": "Body type determining if the operation will create a solid or a surface.",
+        "oneOf": [
+          {
+            "description": "Create a body that has two caps, creating a solid object.",
+            "type": "string",
+            "enum": [
+              "solid"
+            ]
+          },
+          {
+            "description": "Create only the surface of the body without any caps.",
+            "type": "string",
+            "enum": [
+              "surface"
+            ]
+          }
+        ]
+      },
       "CameraDragInteractionType": {
         "description": "The type of camera drag interaction.",
         "oneOf": [
@@ -1829,6 +1848,15 @@
             "description": "Command for extruding a solid 2d.",
             "type": "object",
             "properties": {
+              "body_type": {
+                "description": "Should this extrude create a solid body or a surface?",
+                "default": "solid",
+                "allOf": [
+                  {
+                    "$ref": "#/components/schemas/BodyType"
+                  }
+                ]
+              },
               "distance": {
                 "description": "How far off the plane to extrude",
                 "allOf": [
@@ -1890,6 +1918,15 @@
             "description": "Command for extruding a solid 2d to a reference geometry.",
             "type": "object",
             "properties": {
+              "body_type": {
+                "description": "Should this extrude create a solid body or a surface?",
+                "default": "solid",
+                "allOf": [
+                  {
+                    "$ref": "#/components/schemas/BodyType"
+                  }
+                ]
+              },
               "extrude_method": {
                 "description": "Should the extrusion create a new object or be part of the existing object.",
                 "default": "merge",
@@ -1954,6 +1991,15 @@
                   }
                 ]
               },
+              "body_type": {
+                "description": "Should this extrude create a solid body or a surface?",
+                "default": "solid",
+                "allOf": [
+                  {
+                    "$ref": "#/components/schemas/BodyType"
+                  }
+                ]
+              },
               "center_2d": {
                 "description": "Center to twist about (relative to 2D sketch)",
                 "default": {
diff --git a/modeling-cmds/src/def_enum.rs b/modeling-cmds/src/def_enum.rs
index ce04621b..5aa38c7a 100644
--- a/modeling-cmds/src/def_enum.rs
+++ b/modeling-cmds/src/def_enum.rs
@@ -23,6 +23,7 @@ define_modeling_cmd_enum! {
             length_unit::LengthUnit,
             shared::{
                 Angle,
+                BodyType,
                 ComponentTransform,
                 RelativeTo,
                 CutType, CutTypeV2,
@@ -128,6 +129,9 @@ define_modeling_cmd_enum! {
             /// Should the extrusion create a new object or be part of the existing object.
             #[serde(default)]
             pub extrude_method: ExtrudeMethod,
+            /// Should this extrude create a solid body or a surface?
+            #[serde(default)]
+            pub body_type: BodyType,
         }
 
         /// Command for extruding a solid 2d to a reference geometry.
@@ -150,6 +154,9 @@ define_modeling_cmd_enum! {
             /// Should the extrusion create a new object or be part of the existing object.
             #[serde(default)]
             pub extrude_method: ExtrudeMethod,
+            /// Should this extrude create a solid body or a surface?
+            #[serde(default)]
+            pub body_type: BodyType,
         }
 
         fn default_twist_extrude_section_interval() -> Angle {
@@ -182,6 +189,9 @@ define_modeling_cmd_enum! {
             pub angle_step_size: Angle,
             ///The twisted surface loft tolerance
             pub tolerance: LengthUnit,
+            /// Should this extrude create a solid body or a surface?
+            #[serde(default)]
+            pub body_type: BodyType,
         }
 
         /// Extrude the object along a path.
diff --git a/modeling-cmds/src/shared.rs b/modeling-cmds/src/shared.rs
index 6fb66619..f8fec200 100644
--- a/modeling-cmds/src/shared.rs
+++ b/modeling-cmds/src/shared.rs
@@ -1041,6 +1041,19 @@ impl From<EngineErrorCode> for http::StatusCode {
     }
 }
 
+/// Body type determining if the operation will create a solid or a surface.
+#[derive(Default, Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+#[cfg_attr(feature = "ts-rs", ts(export_to = "ModelingCmd.ts"))]
+pub enum BodyType {
+    ///Create a body that has two caps, creating a solid object.
+    #[default]
+    Solid,
+    ///Create only the surface of the body without any caps.
+    Surface,
+}
+
 /// Extrusion method determining if the extrusion will be part of the existing object or an
 /// entirely new object.
 #[derive(Default, Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize, JsonSchema)]
@@ -1342,6 +1355,7 @@ impl_extern_type! {
     // Scene
     SceneSelectionType = "Enums::_SceneSelectionType"
     SceneToolType = "Enums::_SceneToolType"
+    BodyType = "Enums::_BodyType"
     EntityType = "Enums::_EntityType"
     AnnotationType = "Enums::_AnnotationType"
     AnnotationTextAlignmentX = "Enums::_AnnotationTextAlignmentX"
diff --git a/modeling-session/examples/cube_png.rs b/modeling-session/examples/cube_png.rs
index ee77301e..3387d788 100644
--- a/modeling-session/examples/cube_png.rs
+++ b/modeling-session/examples/cube_png.rs
@@ -113,6 +113,7 @@ async fn main() -> Result<()> {
                 faces: None,
                 opposite: Default::default(),
                 extrude_method: Default::default(),
+                body_type: Default::default(),
             }
             .into(),
         )
diff --git a/modeling-session/examples/cube_png_batch.rs b/modeling-session/examples/cube_png_batch.rs
index dfa77936..0af4bc99 100644
--- a/modeling-session/examples/cube_png_batch.rs
+++ b/modeling-session/examples/cube_png_batch.rs
@@ -104,6 +104,7 @@ async fn main() -> Result<()> {
             faces: None,
             opposite: Default::default(),
             extrude_method: Default::default(),
+            body_type: Default::default(),
         }),
         cmd_id: random_id(),
     });
diff --git a/modeling-session/examples/lsystem_png_batch.rs b/modeling-session/examples/lsystem_png_batch.rs
index 2e9a30e1..c45d5910 100644
--- a/modeling-session/examples/lsystem_png_batch.rs
+++ b/modeling-session/examples/lsystem_png_batch.rs
@@ -143,6 +143,7 @@ async fn main() -> Result<()> {
             faces: None,
             opposite: Default::default(),
             extrude_method: Default::default(),
+            body_type: Default::default(),
         }),
         cmd_id: random_id(),
     });