diff --git a/fj/src/lib.rs b/fj/src/lib.rs
index 44f967bbc..2cf19969c 100644
--- a/fj/src/lib.rs
+++ b/fj/src/lib.rs
@@ -16,7 +16,8 @@ mod syntax;
 
 pub mod prelude {
     pub use crate::syntax::{
-        Group as _, Rotate as _, Sketch as _, Sweep as _, Translate as _,
+        Difference as _, Group as _, Rotate as _, Sketch as _, Sweep as _,
+        Translate as _,
     };
 }
 
diff --git a/fj/src/syntax.rs b/fj/src/syntax.rs
index 7c809c713..e79696a08 100644
--- a/fj/src/syntax.rs
+++ b/fj/src/syntax.rs
@@ -1,3 +1,45 @@
+pub trait Difference {
+    fn difference<Other>(&self, other: &Other) -> crate::Difference2d
+    where
+        Other: Clone + Into<crate::Shape2d>;
+}
+
+impl<T> Difference for T
+where
+    T: Clone + Into<crate::Shape2d>,
+{
+    fn difference<Other>(&self, other: &Other) -> crate::Difference2d
+    where
+        Other: Clone + Into<crate::Shape2d>,
+    {
+        let a = self.clone().into();
+        let b = other.clone().into();
+
+        crate::Difference2d::from_objects(a, b)
+    }
+}
+
+pub trait Group {
+    fn group<Other>(&self, other: &Other) -> crate::Group
+    where
+        Other: Clone + Into<crate::Shape3d>;
+}
+
+impl<T> Group for T
+where
+    T: Clone + Into<crate::Shape3d>,
+{
+    fn group<Other>(&self, other: &Other) -> crate::Group
+    where
+        Other: Clone + Into<crate::Shape3d>,
+    {
+        let a = self.clone().into();
+        let b = other.clone().into();
+
+        crate::Group { a, b }
+    }
+}
+
 pub trait Rotate {
     /// Create a rotation
     ///
@@ -69,24 +111,3 @@ where
         }
     }
 }
-
-pub trait Group {
-    fn group<Other>(&self, other: &Other) -> crate::Group
-    where
-        Other: Clone + Into<crate::Shape3d>;
-}
-
-impl<T> Group for T
-where
-    T: Clone + Into<crate::Shape3d>,
-{
-    fn group<Other>(&self, other: &Other) -> crate::Group
-    where
-        Other: Clone + Into<crate::Shape3d>,
-    {
-        let a = self.clone().into();
-        let b = other.clone().into();
-
-        crate::Group { a, b }
-    }
-}
diff --git a/models/spacer/src/lib.rs b/models/spacer/src/lib.rs
index 46cdf27f1..16af20e4a 100644
--- a/models/spacer/src/lib.rs
+++ b/models/spacer/src/lib.rs
@@ -1,5 +1,7 @@
 use std::collections::HashMap;
 
+use fj::prelude::*;
+
 #[no_mangle]
 pub extern "C" fn model(args: &HashMap<String, String>) -> fj::Shape {
     let outer = args
@@ -22,10 +24,8 @@ pub extern "C" fn model(args: &HashMap<String, String>) -> fj::Shape {
         fj::Circle::from_radius(outer).with_color([0, 0, 255, 255]);
     let inner_edge = fj::Circle::from_radius(inner);
 
-    let footprint =
-        fj::Difference2d::from_objects(outer_edge.into(), inner_edge.into());
-
-    let spacer = fj::Sweep::from_shape_and_length(footprint.into(), height);
+    let footprint = outer_edge.difference(&inner_edge);
+    let spacer = footprint.sweep(height);
 
     spacer.into()
 }