diff --git a/src/shapes.ts b/src/shapes.ts
index 2bc42fe..7a4253d 100644
--- a/src/shapes.ts
+++ b/src/shapes.ts
@@ -277,10 +277,12 @@ export function build(name: string, scene: Scene, shape: Shapes.Shape, customize
             const mat = new StandardMaterial(name + '.texture', scene);
             mat.diffuseColor = new Color3(shape.value.r, shape.value.g, shape.value.b);
             if (shape.value._variant === "transparent") mat.alpha = shape.value.alpha;
-            return build(name + '.inner', scene, shape.value.shape, {
+            const t = build(name + '.inner', scene, shape.value.shape, {
                 ... customize,
                 material: async m => (await m.allnodes).forEach(n => n.material = mat),
             });
+            t.cleanups.push(() => mat.dispose());
+            return t;
         }
 
         case "Sound": {