STEP: A standard format for exchanging product data that is compatible with many CAD/CAM programs. STEP files are reliable and can be used to share 3D models across platforms. 

STL: A 3D design file format that is often used in the early stages of manufacturing. STL files are made up of tiny triangles that combine to form the final design. 

DXF: A drawing exchange format that is often used for water jet, laser, or plasma cutting. 

IGES: An initial graphics exchange specification format that is often used for Computer-Aided Manufacturing (CAM). 

G-code files: A text file format that contains command lines that control the movement of CNC machines. G-code files are often used in the form of *.nc files, but other extensions include *.cnc, *.ngc, *.gcode, or *.tap.

NC files: A text-based file format that contains G-code, which is a programming language that controls CNC machines.