  In this letter, we provide experimental evidence of bandgap tunability with
global prestrain in additively-manufactured tensegrity-inspired lattice
structures. These lattices are extremely lightweight and designed to exhibit a
nonlinear compressive response that mimics that of a tensegrity structure. We
fabricate them out of a stiff polymer but, owing to their peculiar design, they
are compliant and remain elastic up to high levels of precompression. In turn,
unlike tunable metamaterials made of soft polymers, the response of our
lattices is not dominated by damping. We perform experiments on a
one-dimensional lattice subject to longitudinal wave excitation and varying
levels of static longitudinal precompression, and observe continuous tuning of
both the wave speed and the location and width of the lowest-frequency bandgap.
