Both shafts were straight and appear to be high quality. They come with a lead screw which is great as all my lead screws are 8mm pitch. I plan to put them on my 3D printer to get more accuracy on the Z axis. If you are planning to replace the 8mm pitch rods on your 3D printer, you will need to update the firmware and change the steps for the specific access axis. Take the current value and multiply it by 4.
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