I just finished my c-beam build this weekend. I opted for an arduino with grbl and some cheap tb6560 stepper drivers. With a little help from google and @Metalguru, my drivers are configured and the machine is running. I used a proto-board from amazon to build a shield with screw terminals to sit atop my arduino to easily connect to my drivers. However, once I began wiring it all up, I was a little less than pleased. Everything works, but my shield needed a redesign. So designed this. I havent ordered any of the boards yet, but I thought I would share in case anyone else was interested. It is untested, so please verify the wiring would meet your needs, as it is the traditional grbl layout and I left out spindle controls and coolant enable. OSH Park ~ tb6560 grbl shield If anyone notices any problems or has any suggestions, please let me know.