N12 is named for the material it’s made out of: Nylon 12. This solid nylon is created by the SLS 3D printing process. Shapeways calls this material “white, strong, and flexible”, because its strength allows it to bend without breaking when printed very thin. With a minimum wall thickness of .7 mm, it is possible to make working springs and almost thread-like connections. For a bikini, the nylon is beautifully functional because it is waterproof and remarkably comfortable when wet.