This model was designed in Morphi app using tori. Support is needed under the 2 outer rings to print this model (see printing image above). Print our model or design your own in the app. In Morphi, users of all skill levels can make 3D printable objects on the go using touch, without wifi or a mouse. Download the app for free for iPad and IPad mini on the App Store. https://itunes.apple.com/us/app/morphi/id833530351?mt=8 Coming soon for Android!Copyright 2014-2015, The Inventery, Inc.