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I have made quite a few of these on a Kossel XL with great results, and have given most away to amazed friends. Thanks for a lovely design. I have modelled the behaviour, and I think it would be possible to put 6 at the corners of a hexagon, but hey would need a different angle (exponential co-efficient) to mesh correctly. I think I may be able to build this in OpenSCAD, but is there any chance of you sharing how you designed the teeth and made them follow the curve, beyond your reply to Alex-3d on 2014-05-13. Thank you.