It would be helpful to know what motors were used by @abuharsky and @kolin. They may have been low current high inductance motors, which are not suitable for operation with a 12V supply anyway. Hint: if a bipolar motor has "Rated voltage: 12V" in the specification, then it is NOT suitable for use in a 3D printer with 12V power, because much more than 12V will be needed to reach sensible speeds.
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