Ink formulation. Stock solutions of 1.5 wt% CBP (prepared by neutralization of a suspension of CBP in water using 25 wt% NaOH), 15 wt% GelMA (dissolved in water at 60 ºC) and 4 wt% LAP (dissolved in water) were used for the formulation of the inks (Table ). The CBP gel was weighed in a 20 mL conical tube and centrifuged at 1050g for 3 min. Next, the GelMA, water, and LAP were added, and the inks were heated for approximately 5 min at 60 ºC and vortexed. Finally, the inks were centrifuged at 2900g for 5 min to remove bubbles introduced during the mixing process.