  We present Shape-Haptics, an approach for designers to rapidly design and
fabricate passive force feedback mechanisms for physical interfaces. Such
mechanisms are used in everyday interfaces and tools, and they are challenging
to design. Shape-Haptics abstracts and broadens the haptic expression of this
class of force feedback systems through 2D laser cut configurations that are
simple to fabricate. They leverage the properties of polyoxymethylene plastic
and comprise a compliant spring structure that engages with a sliding profile
during tangible interaction. By shaping the sliding profile, designers can
easily customize the haptic force feedback delivered by the mechanism. We
provide a computational design sandbox to facilitate designers to explore and
fabricate Shape-Haptics mechanisms. We also propose a series of applications
that demonstrate the utility of Shape-Haptics in creating and customizing
haptics for different physical interfaces.
