If there is a better forum for questions about the Mini XY Engraver? If so, please re-direct.
I have constructed the plotter using the instructions, drivers and Arduino code (Marlin) from here: http://openlab.makeblock.com/topic/57a95d6ec3e2e36a27ec98d7
However, the software downloaded from the link on this page (https://github.com/xeecos/LaserXYPlotter/release) drives the stepper motors beyond the plotter endpoints with any combination of F values and zero locations that I have tried. Can anyone advise appropriate values or is there better software available? Note that one of my steper motors appears to operate in reverse (according to the X+ and X- commands) - is this likely to be a hardware rather than a software issue?