These are "universal" motor cables that must be checked and, if necessary, individually adjusted. Not all motors are wired the same, so this can easily be fixed by swapping the pins in the connectors. The wires themselves are thick, the contacts are well connected. The people who are complaining probably expected "plug and play" and this may or may not depend on your stepper motor wiring. I liked them so much I bought 2 more packs to upgrade the motor cables on my AM8 printer.
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