The static compression was conducted in a customized testing environment. The unit cell prototype was placed vertically on the load frame (fig. S2), where the bottom part of the unit cell was fixed. The top end of the unit cell was connected to the load cell (LUX-B-50 N-ID, Kyowa) through a sleeve bearing made of polytetrafluoroethylene (PTFE) so that the top polygon was constrained in the axial direction but could rotate freely around the longitudinal axis. The top part holding the load cell was actuated by the motor-driven linear stage (BiSlider, Velmex). The displacement was measured by a noncontact laser sensor (CMOS Multi-Function Analog Laser Sensor IL-065, Keyence).

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