Fig. 4

Comminuted distal tibial fracture model to illustrate use of infill versus supports for fabrication of non-target internal anatomy. A Digital 3D model of the tibial fracture case, including the fracture region and additional tibial shaft. (*) Asterisk indicates manually filled cavity. B Digital 3D models of the 70 mm tibial shaft segmented using the BoneCT Default threshold, threshold of cortical bone only and manually filled medullary cavity. C Comparison of the print time calculated by the slicing software for each tibial shaft model when oriented upright or on its side relative to the print bed. D Visual representation of the slicer output for each model in each orientation, showing the generated perimeter path (orange), support structures (green), infill (red), bottom solid layers (purple), and overhangs (blue)