Hey I have a strange problem. I'm in the middle of building my own CNC, controlled by an Arduino mega 2570 running GRBL version: gnea/grbl-Mega I have connected the Arduino mega 2560 to the stepper drives as shown here: Imgur If I just connect one stepper motor to this setup I can control it as I should be able to. There is a bit of chatter from it, and it doesn't move smoothly, but I think that comes down to finetuning of the stepper perimeters. When I connect a second stepper motor the first one just start spinning fast. I have tried with different stepper motors and every combination of the stepper drivers. What could be causing this? I'm at a lost right now... Thank you in advance!