<p>For the original see: <a target="_blank" rel="nofollow" href="https://www.youmagine.com/designs/kossel-plus-magnetic-effector">https://www.youmagine.com/designs/kossel-plus-magnetic-effector</a> </p><p>It's used in conjunction with this: <a target="_blank" rel="nofollow" href="http://www.thingiverse.com/thing:220851">http://www.thingiverse.com/thing:220851</a></p>
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