<ul><li>Researchers at the Universities of Gothenburg and Isfahan have developed a 3D printed bike helmet that protects the head by contracting during accidents.</li><li>The 3D printed bike helmet incorporates auxetic metastructures, which respond differently to impact compared to conventional materials.</li><li>The helmet's protective layer uses a hyperelastic polymer capable of significant deformation while returning to its original shape.</li><li>The 3D printed bike helmet shows potential for improved head protection and customization for individual head shapes.</li></ul>

shock-absorbing 3D printed bike helmet contracts during accidents to protect rider’s head

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