I needed to add some fans to the stepper motor driver. The driver chip gets very hot when the stepper motor is loaded and can deliver around 2 amps. The fans have a high duty cycle because they turn on when the stepper motor driver turns on. That means brushless ball bearing motors are a must. So far these fans have performed exactly how I wanted them to and at a great price. I would give them 5 stars but I haven't had enough time to know they will last. They've been working for a few days now with no problems.
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