Interdigital G-CAPode structures were printed using a BioScaffolder 3.2 (GeSiM mbH ® ) equipped with an extrusion module and a piezoelectric micropipetting tip Nano-Tip J (drop volume: 400 pL, chamber volume: 0.7 µL, maximum operating frequency: 1000 Hz). With the help of a stroboscopic camera the printing parameters (frequency, pulse width, voltage) were adjusted to form stable drops (150 Hz; 90 µs; 60 V) prior to the inkjet printing process of the microporous carbon precursor. For extrusion printing of the mesoporous carbon a 15 mL cartridge was filled with the carbon ink and extruded through a nozzle with a diameter of 90 µm.