See the video and read the story here: https://makezine.com/2015/01/30/level-up-these-3d-printed-thumbsticks-help-the-disabled-play-xbox/ Simply print off as many extensions as you need. Glue together once you've got the shape right. The base module prints fine on my Lulzbot taz4 without support, and so do the normal extensions. The loops and the curved extension were printed with supports. Glue the pieces together to create your custom extension.