Cubic flexahedron
thingiverse
Inspired by the compelling online video at https://www.youtube.com/watch?v=Kg3_gLO-reE, this innovative design takes the form of a cubic flexahedron. Thanks to schuetzi99's link, assembling the model is remarkably straightforward. STL files for version 1 are readily available here, featuring a cube with an edge length of 6.5 cm.
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