Heres my situation, I recently bought a CNCEST 6090 machine. The controller box that came with it does not have a port for a laser hook up or a Z probe. I do not want to void my warranty or possibly damage my unit so I don't want to open it to access the internals. So I bought a cheap 2nd Grbl controller on amazon that has a laser and Z probe connector. I also bought a USB splitter and ran it to both controllers. How can I get Mach3 to run my XYZ and Spindle off of the CNCEST controller, and my Z probe and laser off the other controller? The CNCEST controller runs the axis and spindle motors just fine, I just want to add the laser and Z probe without having to open the box. Basically I just want Mach3 to view both controllers as 1. Any help would be great!