eycash:
Hi!I'm just wondering if it is possble to power a 3v DC motor with the arduino uno board as the power source?
And if so how would you go about doing it?
It's a maybe. If the motor draws less current (using worst case locked rotor current) then the arduino board can provide, then yes it's possible. But it's almost always advantageous to use an independent voltage source to power motors, servos, etc.
Do you have a link to the motor's datasheet or description?
Lefty