I'm running 3 Leadshine AM822 drivers with 2 at more or less their maximum current (5.86A RMS) and my 36v switch-mode power supply just isn't up to it.

I've been recommended to buy an unregulated supply of around 60-70v. I'm guessing that a 10A supply will be enough to drive all three motors (the Z axis requires very little power). Can anyone recommend a supplier or a method of construction.

While I currently have just 3 axes but might want to increase to 5 although the 4th and 5th will need lower power motors.