3D Printed Rotatable Wind Chime Modeling from a Simple Polygon

3D printing is maturing rapidly with advances in materials and mechanism, and has begun to flourish in various design disciplines, such as product design, medical device design, entertainment and fashion design etc. Inspired by the structures of rotatable wind chimes, we propose a method for modeling a 3D printable, collision free, multi-layer rotatable model from an arbitrary simple polygon. Given a simple polygon, we compute a series of internal contours and the corresponding rotating axis, such that each contour can rotate around its axis with no collision in the space. We construct the 3D printable model by adding joints along with each axis. The model can then be fabricated in a planar state, in one piece without assembly. Experiments show that our results are of both rotatable properties and aesthetics, and can be 3D printed with high efficiency.