Printing
Before printing a 3D model from an STL file, it must first be examined for errors. Most CAD applications produce errors in output STL files of the following types:
A step in the STL generation known as “repair” fixes such problems in the original model. Generally STLs that have been produced from a model obtained through 3D scanning often have more of these errors.  This is due to how 3D scanning works-as it is often by point to point acquisition, reconstruction will include errors in most cases.
Once completed, the STL file needs to be processed by a piece of software called a “slicer,” which converts the model into a series of thin layers and produces a G-code file containing instructions tailored to a specific type of 3D printer (FDM printers). This G-code file can then be printed with 3D printing client software (which loads the G-code, and uses it to instruct the 3D printer during the 3D printing process).
Printer resolution describes layer thickness and XĖY resolution in dots per inch (dpi) or micrometers (Ķm). Typical layer thickness is around 100 Ķm (250 DPI), although some machines can print layers as thin as 16