NEAM17 Stepper Motors

I have a Power supply (3-12V and 1A), is it enough for two NEMA17 stepper motors?

NEAM17 Parameters - 5V and 1A

The answer depends on which of several possible ways you are driving the motors and their rated current per winding. To be certain that the power supply can supply enough current, it should be able to supply 2x the rated current for each motor, because two windings are activated at the same time, so 4 A total for two of your motors. If you use a chopper-type motor driver like the A4988 with current limiting, the power supply might need to supply about half of that.