Customisable spool arm for Wanhao i3 Duplicator

The stock spool arm on the i3 is not long enough to hold a lot of spools, so this replacement should fix that. Alternatively can be customised if you want it a different size from my version.

Printer is also re-badged as Aldi Cocoon Create, Maker Select, and Malyan M150 i3 3D

Update (2016-07-04): Added STL for NoSupport version. Can be printed without any support material.

Update (2016-07-11): Modified SCAD file to allow generation of NoSupport version

Update (2017-06-06): Applied fi