Table S1.

Summary of material properties

Microstructure	Geometry	$\frac{{\rho }^{\ast }}{{\rho }_{strut}}$	$\frac{{\rho }_{strut}}{{\rho }_s}$	$\frac{{\rho }_s}{{\rho }_{s-theory}}$	$\frac{{\rho }^{\ast }}{{\rho }_{s-theory}}$	ρ, kg/m3	Estrut, GPa	E* theory, GPa	E* measured, GPa
Nearly dense	Bulk	—	1	0.903 ± 0.04	0.903	3,585	—	—	344 ± 27
	Hexagonal honeycomb	0.287 ± 0.003	1	0.903 ± 0.04	0.259	1,029	344 ± 27	12.2	9.9 ± 1.8
	Triangular honeycomb	0.293 ± 0.003	1	0.903 ± 0.04	0.265	1,050	344 ± 27	33.6	27.4 ± 1.0
Foam	Bulk	—	1	0.210 ± 0.01	0.210	834	—	—	21.8 ± 1.2
	Hexagonal honeycomb	0.275 ± 0.01	1	0.210 ± 0.01	0.058	229	21.8 ± 1.2	0.68	1.36 ± 0.06
	Triangular honeycomb	0.288 ± 0.01	1	0.210 ± 0.01	0.060	240	21.8 ± 1.2	2.09	3.04 ± 0.26