Copy Mach3USB.dll and paste it into your C:\Mach3\Plugins\ directory.

Write down the COM port number (e.g., COM4, COM7). You will need this for your G-code sender.

: Download and install Mach3. Do not select the "parallel port driver" during installation if you are using a USB connection.

: Use the arrow keys to test movement. If an axis moves in the wrong direction, go to Ports and Pins Motor Outputs and toggle the Dir LowActive 4. Calibration & Testing Before your first cut, verify the machine's accuracy:

After connection:

If your 3040 model includes limit switches, you must configure them to prevent physical crashes.

Before plugging anything into your computer, you must ensure the physical machine is properly assembled and squared.

Before connecting USB, you must ensure the mechanical assembly is correct.

Always test your machine with the cutting bit removed to avoid accidental damage.

The final step before introducing electricity is connecting all the cables. Route the stepper motor cables and the spindle power cable to your control box, securing them in the cable chain to prevent snagging. Before powering on, do a thorough inspection:

If motor doesn’t move but no error → suspect or step/dir wiring → show wiring helper.