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Hi nic6911, First off I would like to say thank you for publishing. Second, I would like to list the nice things in your design that I am going to copy for my hobby machine. Using angle aluminum and U-bolts to hold the bearings. Brilliant, fast, cheap, adjustable & reliable. Using pipe as linear rails and structure (as u mention). With inner threaded rod to hold it together. Again, the qualities, fast, strong, cheap, easy. The simple 3 motor design that minimizes part count. Looks strong too. Your design leads to many variants, which is good. Scalability. Again, thanks for showing me some tricks.
Ron L.