Fig. 7

Voxel to voxel error compared to strut center (skeleton) for 6 scaffolds. Gaps between vertical lines approximated the fiber extrusion width of the 3D printer nozzle. Scaffolds with homogeneous porosities had more uniform gaps than their heterogeneous counterparts due to their more uniform strut widths. Thicker struts, or more voxels located farther from the skeleton, were observed for heterogeneous scaffolds over their homogeneous counterparts due to changing pore sizes. Voxels farthest from the strut skeleton lie on the exterior boundary and thus exhibited more random pattern than the vertical lines seen closer to the skeleton. Exterior voxels was likely support material from 3D printing that was not completely removed