HUGE Wanhao Duplicator 4 / MakerBot Duplicator (And Others) Spool Holder Spare Nut

This is a much, much wider nut made for the Wanhao Replicator 4. It will likely work for other printers too.

This is a customized version of the fabulous NUT JOB project by mike_linus. I originally made a more or less exact copy of the nuts that came with the printer (see source), but also figured, hey, why not make bigger ones to stop the spools from falling off for good!

The outer diameter (flat to flat) is 55 mm, it is 6 mm thick, the inner diameter is 30 mm (enlarged to 31.2 mm in orde