In a nutshell any grbl control board should work…
I think this Monport board is a plug compatible with the nano, along with this OMTech… The Monport is a 328p based controller (8 bits) … the OMTech is a 32-Bit ARM Cortex-M3 based controller… it also comes with Smoothieware firmware… about 3 times the cost of the 8 bit board.
There is also a relatively low cost controller for these that lots of people use, but it’s not a direct plugin as far as I know.
Search this site for threads on using the DLC32 control boards… It’s open source and open hardware… lots of people sell these, like Amazon…
