
Bought these for my first CNC build. The engines run great with no problems. I had to connect them. If you're a beginner like me, remember the current rating is 4.2a. A cheap $7 driver won't work. These bad guys need big drivers. When construction was complete and testing began, cheap drivers worked just fine. When trimmed, cheap drivers just couldn't compete with them. Invest in good drivers to take full advantage of these engines.

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