Writing custom G-code is where digital design truly becomes physical reality. While standard CAM software (like Cura, PrusaSlicer, or Fusion 360) generates thousands of lines of G-code automatically, knowing how to write or modify custom G-code unlocks total control over your CNC machine, 3D printer, or laser cutter. It transforms you from a passive operator into a true machine whisperer.
What is G-Code?
G-code (Geometric Code) is the universal programming language used to control Computer Numerical Control (CNC) machinery. Developed in the 1950s at the Massachusetts Institute of Technology (MIT) for early automation, it tells a machine where to move, how fast to move, and what actions to perform (like turning on a spindle, heating a nozzle, or triggering a laser).
Every line of G-code typically consists of a command letter followed by an axis or parameter:
- G-commands (Preparatory Functions): Tell the machine what kind of motion to make (
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