How many types of 3D printing are there?
3D打印有多少种类？
There are 7 different types of 3D printing formulated by ASTM International officially in the ISO/ASTM 52900 standard: Material extrusion Material jetting Binder jetting Sheet lamination Vat photopolymerization Powder bed fusion Directed energy deposition
ASTM International(美国材料和试验协会)在ISO / ASTM 52900标准中正式制定了7种不同的3D打印类型： 材料挤制 材料喷射 黏合剂喷射 板层压成型 光聚合固化 粉床熔合 直接能量沉积