During installation, do not choose the parallel port driver if you are connecting via USB.

To prevent disconnects during long jobs, use a shielded USB cable with a magnetic ferrite ring.

Most 3040 units come with a dedicated machine control unit (MCU) that houses the stepper drivers and power supply. USB Interface Card: This internal board (like the Planet CNC RNR Motion card Go to product viewer dialog for this item.

You must copy a specific DLL file (often named NcUsbPod.dll or rnrmotion.dll ) provided with your machine into the Mach3/PlugIns folder.