There’s been a bit of discussion on the forum about the adaptations required to run the Polargraph firmware on RAMPS. The good news is it’s easy. I’ve just committed some changes to the polargraph_server_polarshield firmware that should make it easier to run on different hardware other than the Polarshield.

There is a little chunk of code like this in the main polargraph_server_polarshield.ino file:

#ifndef MOTHERBOARD
#define MOTHERBOARD POLARSHIELD
//#define MOTHERBOARD RAMPS14
#endif

Comment out the POLARSHIELD line and comment in the RAMPS14 line, and your machine will be rigged for RAMPS. See this Polargraph wiki article wot I wrote up.