Grbl is a no-compromise, high performance, low cost alternative to parallel-port-based motion control for CNC milling. It will run on a vanilla Arduino (Duemillanove/Uno) as long as it sports an ...

I'm also thinking of making a serial-pass-through program on a second arduino, placed between PC and GRBL. It will send any serial data from PC to GRBL and vice versa.

The proprietary control of CNC machines results in the inability to control and enhance inputs because the program codes cannot be modified owing to their distribution by vendors in the compiled form.