Fig. 2.

Shape fidelity of 1 and 1.5 MDa PHA at varying concentrations. The 1.5 MDa − 4 wt% and 1 MDa − 8 wt% formulations printed the best (outlined in red boxes). A) The printed object was a 3-layer grid with alternating layers of 6 horizontal or 6 vertical lines in a rectilinear pattern. Cellink Start had good shape fidelity after printing, while toothpaste only had medium shape fidelity due to quick material relaxation and loss of defined edges shortly after printing. B) Shape fidelity scores for 1 and 1.5 MDa PHA formulations. For both molecular weights, the shape fidelity increased, reached a peak, and decreased as the concentration of PHA increased. C) Macro images within 1 min after printing and before crosslinking from a top view to show the shape fidelity. Pore areas appeared to generally increase while strut sizes generally decreased with increasing PHA concentrations. Scale bars: 5 mm. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)