3D Printed Gyrobifastigium

In geometry, the gyrobifastigium is the 26th Johnson solid (J26). It can be constructed by joining two face-regular triangular prisms along corresponding square faces, giving a quarter-turn to one prism. It is the only Johnson solid that can tile three-dimensional space.

https://en.wikipedia.org/wiki/Gyrobifastigium

Available in multiple sizes and colors.