Printing. The ink was loaded into 3 cc syringe barrels (Nordson EFD). The ink-filled syringe was then fitted with a silanized pre-pulled glass nozzle with 30 µm inner diameter (World Precision Instruments TIP30TW1LS01), capped, and centrifuged for 20 minutes at 4500 RPM to remove bubbles. Then, the inkloaded syringe barrel was placed in a high-pressure dispensing tool (Nordson EFD) and connected to an electronic pressure regulator (Ultimus V, Nordson EFD). The printhead (syringe, high-pressure dispensing tool, nozzle) was mounted on a custom 3-axis cartesian motion stage (Aerotech, Inc., Pittsburg, PA, USA).