C), and the white or transparent TPUs turned yellowish after post-processing. As seen in micrographs in Figure 5B, it was observed that the boundaries between printed lines became blurred and were filled with adhered materials regardless to build direction. We verified the effectiveness by printing small test pouches and comparing maximum sealing pressure for raw and heat-treated pouches. As a result, the raw pouches could withstand 129 kPa on average, while the heat-treated pouches could withstand 756 kPa on average, which is an increase of 5.58 times (Figure S7).