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A fake spindle that holds a pen. I designed this for Cyclone Factory PCB (http://www.thingiverse.com/thing:49484) I built. I thought it might be useful to draw pcb board first before milling. Might be useful for checking XY gear ratio as well. <br/>
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Video of Z Probe and Milling: <ahref="http://youtu.be/mdT-6VdgRn0"target="_blank"rel="nofollow">youtu.be/mdT-6VdgRn0</a>