SMF - Just Installed!
http://benboxlaser.us/index.php/topic,20.msg132.html#msg132
The one opposite the Nano is the X, the other is for the 2 Y motor's.Vref / 0.8 = Imax, so the X motor is current limited at 0.5A and it runs smooth with no excessive heat buildup. It could go higher but there's no point.The Y motors are limited to less current each but with 2 of them to share the load everything works well.-Zax.
That is mounted upside down compared to our machines. So your X is lower left. The next two to the right are your Y.
It will work either way. But your electrons will be upside down! LOL