Wawa:
Your (unspecified) servos might be drawing more than 550mA on startup.
Good thing is that servos only draw significant current when moving (or trying to).A Mega can control AFAIK 48 servos directly (without any shield).
An Uno is limited to 12."This Adafruit module seems expensive to only be able to run 2 stepper motors"
I thought you were asking about servos.
Leo..
They're SG90 long runner KY66 servos. And I do suppose that makes sense as they only draw that current when moving. So if I wanted more than 3 to run simultaneously I would need something that can output over 2A correct? And yeah not sure why I threw that stepper motor info in there, it said they could run servos as well but didn't give a number so I defaulted to thinking it would only do 2 servos as well, shouldn't have assumed anything.