There aren’t a lot of builds in the wild as of january 2019. Sure they work fine but rods and bearings are going to be cheaper, heck at that size i'd be considering cheap linear rails if i was building my own. » Blog Archive » Linear motion DIY ideas CNC Do yourself a favor and swap them over for some genuine openbuilds wheels, the difference in motion is night and day. V slot wheels vs linear rails . V slot wheels vs linear rails, which one is a better option. And at the other side linear rails are is simpler, less elements, doesn't need to be tightened, but requires precision in the mounting. I have found that my delrin wheels develop flat spots if left alone for several weeks. Similarly, you can get great results from v slot, but you have to make sure it is straight, and you're not going to get the precision you will get from quality linear rails. In the example in the picture, that would be a great example of how not to implement v slot wheels. Finally, i...