Super low friction universal spool holder for Wanhao Duplicator i3

Edit - 09.11.2015

Added one with a hex for the mounting cone and rounded edges on the roller -> Holder02.STL

Also added a nut ->Holder03.STL

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This spool holder fits on the stock Wanhao bracket in place of the stock plastic holder and attaches with the stock nut. There is no need to tighten it hard. As long as the spool hole is circular and can fit over the 42mm end of the roller, it will work and roll with super low friction. The filament w