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Great design, works very well, thanks for sharing. One thing I noticed from the one I made (see http://www.thingiverse.com/make:42659http://www.thingiverse.com/mak... ) is that the bearings seem to run on their edges, not on the flat part of the bearing. Is this just an offset problem, or intentional?

Threadless Ball Screw. No More Backlash