I've built a 3' C-Beam Actuator and I don't think the 12v power supply (1.6 amps) is sending enough amps to the GRBL shield on the Arduino as the machine seems to be laboring under a strain. Before I go out and buy a 24V power supply, I'd like to know if a Maplins DC regulated power supply would be able to drive the 3 steppers instead. It puts out 13.8V at 3 amps continuous. This thing is up on a shelf doing nothing, but I'm not sure the amps are too much for the board. Thanks a lot. Michael.