Finding the Best Free G-Code Senders for Your CNC Machine If you’ve just finished building a CNC router or set up your first 3D printer, you’ve likely realized that the machine needs a "brain" to talk to your computer. That’s where a G-code sender comes in. It acts as the bridge, taking the instructions (G-code) from your CAM software and feeding them line-by-line to your machine’s controller.

While most are cross-platform, some (like Candle) are more optimized for Windows.

Ensure the sender supports your machine's firmware (most hobby machines use GRBL , while 3D printers often use Marlin ).