All the samples were manufactured using a Prusa i3 MK3S+ with MMU2S multi-material module (Prusa Research, Czech Republic). The 3D printing parameters applied for PLA (Raise3D, Irvine, USA) and CB-PLA (Protopasta Inc, Vancouver, USA) were: nozzle diameter -0.4 mm, nozzle temperature -220˚C, building platform temperature -60˚C, layer thickness -0.2 mm, infill -40%, first six and last six layer infill -100%, extrusion multiplayer -1.1 print speed -40 mm/s, first layer print speed -20 mm/s and the infill lines were printed at +45˚/-45˚ degree angles. We used higher printing temperatures to affect the mechanical and electric properties due to higher fusion between the layers . This is a beneficial observation from the point of view of printing composite materials with carbon fillers because printing these materials at too low a temperature leads to clogging the nozzle. The infill pattern only insignificantly affects the mechanical properties . The 40% infill was proposed to optimise the material use and printout duration, resulting in significant material and energy savings. 100% infill was only used for the six layers at the bottom and top of the electrode 3DP with conductive material to ensure leak tightness of the print during measurements in water solutions, which is visible in the cross-section of the electrode Fig. . For comparison, the printout of the sample used in the mechanical tests using the proposed parameters took 49 min and consumed 11.2 g of PLA. Printing the same sample with 100% infill takes 59 min (20% longer duration), and the sample weight is 14.5 g (29% higher consumption).