Autodesk Tinkerplay is a free app that lets you design and customize your own creatures and characters on your mobile device and make them real using a 3D printer. There are versions of the app for Windows, iPads and Android devices.
You can choose from the supplied collection of professionally designed character templates or create your own model from scratch.
Once the model has been designed, the app will produce a plan for printing the components needed to assemble the model if you want to print it out.
Even if you don’t have access to a printer, this would be a useful app for designing characters to use in digital storytelling activities. It’s possible to add various backgrounds to the model, hide the menus and screengrab to use in other software such as Comic Life where you could add speech bubbles and other bits of text.