The mandrel was rotated at 300 rpm, and the voltage of the mandrel was set to -5 kV, while the needle was set to +17 kV. The electrospinning was conducted for 4 hours. The needle scanned back and forth across the width of the mandrel at a rate of 5 mm/s to deposit a uniform layer of nanofibers (Figure ). After the electrospinning was completed, the PS sheet was placed in the laser cutter to cut out circular inserts of 18.5 mm diameter (Figure and Figure ). The laser-cutting process also heat-fused the edges of the nanofiber and PS layers.