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From [1] and elsewhere, it says that to reverse bipolar stepper motor direction, you switch only one winding. However, in RAMPS OSE work - reversing (flipping) the entire plug means you are reversing both pairs of coils, no? So in practice, it seems that reversing BOTH windings makes for opposite direction spin.

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Wiring Stepper Motors in Series
How to reverse direction of a stepper motor by wiring - [2]
Stepper Motors on Wikipedia - [3]
Different types of steppers explained at All About Circuits - [4]

Stepper Motor Windings

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Stepper Motor Windings

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