CNC Z axis motion kit. Taken from a light weight CNC machine I was building years ago and never got around to using. 16mm 300mm long rails with 3 carriage per rail. 10mm pitch lead screw with shortened nut carrier to maximise travel. This had a total travel of 160mm when assembled. I have similar X and Y axis kits available with 750mm rails, NEMA 23 motors, belts and pulleys, and lots of other CNC bits for sale that I haven't listed let. Message me for details.
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