To evaluate the suitability of the heated cylindrical collector for fabricating tubes from high melting temperature materials, samples with diamond-shaped pores were designed . By adjusting the printhead temperature to 230°C and increasing the collector temperature to 150°C, smooth nylon-12 fibers with a diameter of 60 μm and precise layer stacking were achieved (Figure ). To ensure control of the jet solidification dynamics, the distance between the cylindrical collector and the nozzle was set to 1 mm. To prevent arcing and processing defects resulting from directly printing on an electrically conductive surface, the voltage was set to 1.4 kV. To stabilize the jet, nylon-12 was deposited for several turns before the print commenced.