Wanhao Duplicator 6 (D6) Spool Holder w/ Threads (Revision 1)

The length that the spool rests on the spool holder is 100mm. The width of the arm is about 28mm. The stock 30mm x 1.5 pitch threaded nut fits the holder's threads nicely. It seems to fit a wide variety of spool widths and spool holder hole sizes. I've based this off the factory included spool holder. A radius fillet has been added between the base and arm for extra strength.