By knowing 3D printer prints layers, the STL file should be sliced into layers.
And when the model is finished, it needs to be export as STL file. Normally, it is CAD software where to design the 3D model. To help understand model slicing, let's take a step back to 3D model creating first. No matter what kind of 3D Printing technology was utilized, FDM, SLA, SLS, MJF, or Metal 3D Printing, 3D printers are building a solid object layer by layer, which indicates that 3D printers need geometric information of every layer.
