diff --git a/experiments/2025-03-18/src/main.rs b/experiments/2025-03-18/src/main.rs
index fd72c7487..900778af0 100644
--- a/experiments/2025-03-18/src/main.rs
+++ b/experiments/2025-03-18/src/main.rs
@@ -10,9 +10,7 @@ mod topology;
 
 fn main() -> anyhow::Result<()> {
     let tri_mesh = fj_viewer::make_viewer_and_spawn_thread(|viewer| {
-        let tri_mesh = model::model();
-        viewer.display(tri_mesh.clone());
-        tri_mesh
+        model::model(&viewer)
     })?;
 
     fj_export::export(&tri_mesh, "output.3mf")?;
diff --git a/experiments/2025-03-18/src/model.rs b/experiments/2025-03-18/src/model.rs
index fa7fce8bd..3be0759d9 100644
--- a/experiments/2025-03-18/src/model.rs
+++ b/experiments/2025-03-18/src/model.rs
@@ -1,5 +1,6 @@
 use fj_interop::TriMesh;
 use fj_math::{Point, Vector};
+use fj_viewer::Viewer;
 
 use crate::{
     geometry::{Sketch, ToTriMesh},
@@ -9,7 +10,7 @@ use crate::{
     topology::surface::Surface,
 };
 
-pub fn model() -> TriMesh {
+pub fn model(viewer: &Viewer) -> TriMesh {
     let top = {
         let sketch = Sketch::from([
             // outer boundary
@@ -44,6 +45,7 @@ pub fn model() -> TriMesh {
     };
 
     let solid = top.sweep([0., 0., -2.]);
+    viewer.display(solid.to_tri_mesh());
 
     solid.to_tri_mesh()
 }