Scutoid, tessellating

thingiverse

Tessellating a single scutoid with itself to form a four-cell configuration is an intriguing concept. The model's polyhedral structure is crucial for self-tessellation, as any non-planar internal faces would inevitably lead to gaps or overlaps. In fact, four nested scutoids come together to create a prismatic octagon with regular octagonal faces, showcasing the beauty of this unique geometric configuration.