These auxetic structures swivel and expand in surprising ways! This is a 3x3 variation has stacked hinges to add strength and rigidity along the Z plane... a.k.a. more smooth & satisfying fidgeting! Each piece is 20mm wide, This version has tapered top and bottom faces.

Printing Guidelines

Fairly loose requirements, just make sure your printer isn't overextruding and has decent cooling so none of the parts fuse. I used 0.16mm layer height, 3 shells. No supports!

Relevant Video