diff --git a/simpleExample/index.js b/simpleExample/index.js
index 885f863..89c0e46 100644
--- a/simpleExample/index.js
+++ b/simpleExample/index.js
@@ -3,9 +3,17 @@ import * as THREE from 'three';
 import { Interface } from 'doodle3d-slicer';
 import fileURL from '!url-loader!./models/shape.json';
 import { render } from 'react-dom';
-// import fileSaver from 'file-saver';
+import fileSaver from 'file-saver';
+
+const downloadGCode = gcode => {
+  const file = new File([gcode], 'gcode.gcode', { type: 'text/plain' });
+  fileSaver.saveAs(file);
+};
 
 const jsonLoader = new THREE.JSONLoader();
 jsonLoader.load(fileURL, geometry => {
-  render(<Interface geometry={geometry} />, document.getElementById('app'));
+  render(<Interface
+    geometry={geometry}
+    onCompleteActions={[{ title: 'Download', callback: downloadGCode }]}
+  />, document.getElementById('app'));
 });
diff --git a/src/interface/index.js b/src/interface/index.js
index f278ca0..bc0b57c 100644
--- a/src/interface/index.js
+++ b/src/interface/index.js
@@ -46,6 +46,7 @@ class Interface extends React.Component {
     classes: PropTypes.objectOf(PropTypes.string),
     printers: PropTypes.object.isRequired,
     defaultPrinter: PropTypes.string.isRequired,
+    onCompleteActions: PropTypes.arrayOf(PropTypes.shape({ title: PropTypes.string, callback: PropTypes.func })).isRequired,
   };
   state = {
     controlMode: 'translate',
@@ -126,8 +127,9 @@ class Interface extends React.Component {
   }
 
   render() {
-    const { width, height, classes } = this.props;
-    const { sliced } = this.state;
+    const { width, height, classes, onCompleteActions } = this.props;
+    const { sliced, gcode } = this.state;
+
     return (
       <div style={{ width, height }} className={classes.container}>
         <canvas className={classes.canvas} ref="canvas" width={width} height={height} />
@@ -142,7 +144,9 @@ class Interface extends React.Component {
         </div>}
         {sliced && <div className={classes.sliceBar}>
           <button onClick={this.reset}>Slice Again</button>
-          <button>Download</button>
+          {onCompleteActions.map(({ title, callback }, i) => (
+            <button key={i} onClick={() => callback(gcode.gcode)}>{title}</button>
+          ))}
         </div>}
       </div>
     );
diff --git a/src/slicer.js b/src/slicer.js
index db2b28f..d608723 100644
--- a/src/slicer.js
+++ b/src/slicer.js
@@ -96,7 +96,7 @@ function gcodeToString(gcode) {
       const value = command[action];
       const currentValue = currentValues[action];
       if (first) {
-        string = action + value;
+        string += action + value;
         first = false;
       } else if (currentValue !== value) {
         string += ` ${action}${value}`;
@@ -104,6 +104,7 @@ function gcodeToString(gcode) {
       }
     }
     string += '\n';
+    return string;
   }, '');
 }