How to choose the right 3d printing material?

So far, there are more than 20 types of 3D printing technologies on the market, such as FDM, SLA, DLP, SLS, SLM, EBM, DMLS, CLIP, CJP, Polyjet, and more. However, we only introduce the most commonly used 3D printing technologies & materials here,

FDM( Fused Deposition Modeling)
The process uses a digital design (Gcode) that is uploaded to the 3D printer. The filaments are melted and fed onto the build plate, as the nozzle moves across the build plate, the plastic cools and becomes solid, forming a hard bond with the previous layer, layer by layer until the object is finished.

Stereolithography(SLA)
The SLA 3D Printers begin drawing the layers of the support structures, followed by the object itself, with an ultraviolet laser aimed onto the surface of liquid photopolymer resin. After a layer is imaged on the resin surface, the build platform shifts down and a re-coating bar moves across the platform to apply the next layer of resin. The process is repeated layer by layer until the object is complete. 

Selective Laser Sintering(SLS)
The SLS machine begins sintering each layer of part geometry into a heated bed of nylon-based powder. After each layer is fused, a roller moves across the bed to distribute the next layer of powder. The process is repeated layer by layer until the build is complete.

Multi Jet Fusion(MJF)
Multi Jet Fusion uses an inkjet array to selectively apply fusing and detailing agents across a bed of nylon powder, which are then fused by heating elements into a solid layer. After each layer, the powder is distributed on top of the bed and the process repeats until the parts are complete.

Direct metal laser sintering(DMLS, SLM)
The DMLS machine begins sintering each layer-first the support structures to the build plate, then the part itself, with a laser aimed onto a bed of metallic powder. After a cross-section layer or powder is micro-welded, the build plate shifts down and a re-coater blade moves across the platform to deposit the next layer of powder into an inert build chamber. The process is repeated layer by layer until the part is complete.