Appendix B. Taking a Closer Look at G-code

G-code is a numerical control programming language. It's a set of instructions used as a means of controlling automated machines. In this case, it will instruct your 3D printer how to move and how much filament to extrude. It's unlikely that you'll need to examine the G-code that is generated by your slicer. However, knowing a handful of G-code commands can be useful at the command window of your host.