The design of the insole was made up by Ben (One of the guys working on the project). We decided to print the insole in NinjaFlex, a 3D printer filament that is a nice rubbery, flexible plastic. The reason; we wanted the insole to be flexible, although not the best material for an insole its functionality is perfect for a humble prototype. Here are a few pics of the insole being printed along with the final product. A thinner version without the holes for the motors was printed after, this is going to attach on to the top sealing in all the electronics. Ultimately the finish was really nice and suited the job nicely!