Simply write the G-code manually in a text editor and save the file with a. You can write your own G-code using a basic plain text editor such as TextEdit on a Mac or Notepad on Windows. G1 X90.6 Y13.8 (move to 90.6mm on the X axis and 13.8mm on the Y axis) G0 F1500 (set the feedrate to 1500 mm/min) Here are some examples of simple movement G-code: Marlin features a complete G-code movement suite, including lines, arcs, and Bezier curves. It was derived from Sprinter and grbl and became a standalone project in 2011. Most FDM 3D printers use an open-source firmware called Marlin. G-code instructs the stepper motors how much to move, how hot to heat the build plate and nozzle, and it manages other functions such as pausing a print and leveling the bed. Practically all 3D printers are controlled via G-code. For instance, a CNC machine has a spindle, whereas a 3D printer has a heated nozzle. G-code files are not interchangeable between 3D printers and CNC machines because these machines perform very different functions. There are many different varieties of G-code that have many similarities as well as many differences. G-code is the language of 3D printing and CNC machines.
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