diff --git a/crates/fj-window/src/display.rs b/crates/fj-window/src/display.rs
index 209a9bca9..9a665f0db 100644
--- a/crates/fj-window/src/display.rs
+++ b/crates/fj-window/src/display.rs
@@ -1,5 +1,4 @@
-use fj_interop::{mesh::Mesh, model::Model};
-use fj_math::{Aabb, Point};
+use fj_interop::model::Model;
 use fj_viewer::{
     InputEvent, NormalizedScreenPosition, RendererInitError, Screen,
     ScreenSize, Viewer,
@@ -17,15 +16,12 @@ use winit::{
 use crate::window::{self, Window};
 
 /// Display the provided mesh in a window that processes input
-pub fn display(mesh: Mesh<Point<3>>, invert_zoom: bool) -> Result<(), Error> {
+pub fn display(model: Model, invert_zoom: bool) -> Result<(), Error> {
     let event_loop = EventLoop::new();
     let window = Window::new(&event_loop)?;
     let mut viewer = block_on(Viewer::new(&window))?;
 
-    viewer.handle_model_update(Model {
-        aabb: Aabb::<3>::from_points(mesh.vertices()),
-        mesh,
-    });
+    viewer.handle_model_update(model);
 
     let mut held_mouse_button = None;
     let mut new_size = None;
diff --git a/crates/fj/src/handle_model.rs b/crates/fj/src/handle_model.rs
index 93015a74c..be9ccbbbc 100644
--- a/crates/fj/src/handle_model.rs
+++ b/crates/fj/src/handle_model.rs
@@ -1,6 +1,8 @@
 use std::ops::Deref;
 
 use fj_core::algorithms::{approx::Tolerance, triangulate::Triangulate};
+use fj_interop::model::Model;
+use fj_math::Aabb;
 
 use crate::Args;
 
@@ -12,22 +14,26 @@ use crate::Args;
 ///
 /// This function is used by Fornjot's own testing infrastructure, but is useful
 /// beyond that, when using Fornjot directly to define a model.
-pub fn handle_model<Model>(
-    model: impl Deref<Target = Model>,
+pub fn handle_model<M>(
+    model: impl Deref<Target = M>,
     tolerance: impl Into<Tolerance>,
 ) -> Result
 where
-    for<'r> (&'r Model, Tolerance): Triangulate,
+    for<'r> (&'r M, Tolerance): Triangulate,
 {
     let mesh = (model.deref(), tolerance.into()).triangulate();
 
     let args = Args::parse();
     if let Some(path) = args.export {
         crate::export::export(&mesh, &path)?;
-    } else {
-        crate::window::display(mesh, false)?;
+        return Ok(());
     }
 
+    let aabb = Aabb::<3>::from_points(mesh.vertices());
+    let model = Model { mesh, aabb };
+
+    crate::window::display(model, false)?;
+
     Ok(())
 }