Although it would be great for a 3D printer, the slide rail bearing has too much play for the CNC mill which puts different back pressure on it. I should have spent more to get something with a wider bearing support. I just bought stuff to build my own Z axis to replace this. It's a good product though, just be aware of the design limitations. I give it 4 stars because while it's a good product it didn't work for my purpose even though it's sold in the Q&A section.
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