I'm trying to determine the appropriate power supply to run some 12v 1.68amp/phase nema 17 motors on a camera rig. My project is a bit modular, so I'd like to have the ability to power up to 4 motors or as few as 1 depending on what is needed for the shot. I plan to use an arduino with a CNC shield and DRV8225 drivers. What I'm unclear about is how I need to calculate the amperage of the supply: since the amperage is listed as 1.68/phase for each motor, and they are 2 phase motors, do I need to have enough current for 2 times the listed amperage? I've seen threads online which indicate that I only need to supply 2/3x, 1x, or 2x the rated current and I'm not sure what is accurate. (I also gather that the driver will limit the current to whatever I set it to, which presumably also limits the amount the power supply needs to provide) So in short, for a single 12 volt 1.68 amp/phase motor, would I need a 12v 2 amp supply? What about for 3 or 4 motors? And is an off the shelf supply like this appropriate? Thanks!