The design of the pore structure in the supercapacitor can provide a large interface area for the electrochemical reaction of the electrolyte and the electrode. In this study, a thermoplastic polyurethane scaffold having specially designed macropores of various structures and porosity was manufactured to prepare a flexible electrode polymerized with polypyrrole using a 3D printer with a fused deposition modeling method. The fabricated soft electrode scaffolds were characterized using optical microscope, field emission-scanning electron microscope, energy dispersive X-ray spectroscopy, and universal testing machine. It could be confirmed that polymerization took place successfully in all structures, and it was confirmed that mechanical properties tunable according to the pore structure were exhibited. As for the performance of the electrode, it was concluded that the higher the porosity, the better the performance, and there was no significant difference by the effect pore structure. The ladder-structured electrode scaffold with 80% porosity, which showed the best performance, exhibited a capacitance of about 1.31 F/g and an energy density of 0.18 Wh/kg at a current density of 0.5 mA/cm2.