4 axis grbl for 3040z cnc

[mjadams61]

I bought a a 3040z cnc with a 4th axis rotary set up. I am a complete noob when it comes to cnc and I wanted to get something inexpensive to start out with. Now the cnc itself is pretty solid and everything works great and still does even though it is a couple of years old. I want to replace the control board since it is a china rip-off of a Planet CNC control board.

I been doing some research on cnc control boards and since I am on a fix income from a stroke well some of the control boards plus the software to manage the controller is kinda price way out of range for me.

I been looking at 3 axis grbl boards but I really need a little help in where I can find one that will work on my 3040z.

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[routalot]

If it is working well,what are you hoping to achieve by making a change?