WYRD Nativity #LightTheWorld

In celebration of the Christmas season, we've designed a compliant Nativity mechanism which showcases the "Wyrd" kinematic behavior previously shown in other fun 3D printable models. For this rendition, we've designed a nativity where the star stays focused in the center as the walls and ceiling shift around it. Feel free to print your own to #LightTheWorld!

A Wyrd mechanism is a compliant mechanism that has motion similar to a double parallel mechanism. "Wyrd" means Weird Yet Reliable Displacement because of the unintuitive nature of the motion.

The mechanisms are examples of how compliant mechanisms can be used to create specific desired motions. The coupler point rotates but does not translate, as if the point were pinned to ground but it is actually unconstrained. The mechanism workings are disguised by integration with various shapes.

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This design was developed by the Compliant Mechanisms Research Group (CMR) from Brigham Young University (BYU). Follow us at @