*2.5. Microfluidic Experiments*

In order to connect the inlets and outlet, tubing connectors were directly printed onto the microfluidic chips. Dispensing needles (1", Vieweg, Kranzberg, Germany) were plugged into the printed connectors and fixed using epoxy glue. Colored water was pumped through the microfluidic channels using a syringe pump (Legato 210, KDScientific, Holliston, MA, USA) with a pump rate of up to 10 mL/min.
