Additive manufacturing (AM), usually we call it 3d printing, uses computer-aided design to build objects layer by layer. It becomes more and more popular. There are several types of 3d printing technology that 3d printer use today: FDM,SLA,DLP,SLS,MJ,DOD,BJ,DMLS,etc. 1. FDMFused Deposition Modeling-FDM It is the most popular 3d printing technology. Material: Thermoplastic filament(PLA,ABS,PET,TPU,PETG,Nylon,wood) Dimensional Accuracy: