In the past, car bodies and bumpers on the front and back needed to be painted separately because they are made from different materials.

过去，由于车身和前后保险杠的材质不同，它们需要分开喷漆。

One of the most important advantages of large-scale 3D printing for the automotive industry could be the manufacture of molds and dies for sheet metal car body parts, usually a critical production bottleneck.

3D大规模打印对于汽车业来说最重要的优势在于车身钣金部分的模具生产，这通常是制造业中关键的瓶颈。