We have already seen garment and food printers. It is only natural that we will be able to print shoes in the future. The Recreus Sneakerbot II uses Filaflex as filament to create flexible objects. The sneaker this device prints can fold up and fit in your pocket. You could always try to make your own using the 3D file available on Thingiverse. 3D printing is the future, and the future looks bright.