This is very handy when you want to improve the accuracy of your 3D printer or CNC. Stepping requires more steps per mm on the Z axis, but the quality is amazing. This set was perfect for my CoreXY and Cartesian printers. I am planning to buy these to replace the entire Z axis on all my printers. Good quality and nice tight fit on the brass nut. I haven't noticed any significant play, so you don't need a play nut for most 3D printer applications.
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