Very good quality, works perfectly. I switched to a Nema 17 motor for my application, I didn't need the 23's torque nor the extra weight. In a Q&A someone asked if the Nema 17 would fit and the seller said no, fine because the headstock is milled and drilled for both. Maybe they said no because you need a shaft adapter, the Nema 23 has a down-turned ballscrew and the 17 has a smaller shaft. Two of these require a 5mm to 8mm shaft coupler available from Revain UPC 665268871146 for $7.99.
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