Tetrahemihexahedron

thingiverse

The tetrahemihexahedron, a non-convex uniform polyhedron featuring seven faces, stands out due to three intersecting faces unlike conventional polyhedra where faces only touch at edges. Comprising four equilateral triangles and three large squares meeting at the center, this model requires an approximation for printing purposes since it can't be handled by OpenSCAD or 3D printers directly. Fillets are added to make it printable without visible flaws. Customizable options include solid/hollow face choice in STLs and size adjustment via Customizer while a brim may be needed when printing with the hollow face down on the bed.