diff --git a/simpleExample/index.js b/simpleExample/index.js
index 282237a..43f9cd1 100644
--- a/simpleExample/index.js
+++ b/simpleExample/index.js
@@ -9,6 +9,7 @@ const settings = {
 };
 
 const geometry = new THREE.TorusGeometry(20, 10, 30, 30).clone();
+geometry.mergeVertices();
 
 const onProgress = ({ progress: { done, total, action } }) => {
   const percentage = `${(done / total * 100).toFixed()}%`
@@ -17,4 +18,4 @@ const onProgress = ({ progress: { done, total, action } }) => {
 
 sliceGeometry(settings, geometry, null, false, onProgress).then(gcode => {
   document.body.innerHTML = gcode.replace(/(?:\r\n|\r|\n)/g, '<br />');
-});
\ No newline at end of file
+});