Hello,
I just received my ShapeOko bundle with GrblShield v4 in the mail, and it seems to be working perfectly! I'm just a little curious about the jumpers labeled MS0 and MS1 for each axis. I haven't seen them described in any GrblShield documentation - but they are perhaps a new feature in version 4? I'm guessing they are used for changing the microstepping settings, but maybe you could tell me what the exact functionality is?