Inspired by TUSH - spool holder I designed my own - especially to use bigger diameter spools together with my Wanhao i3 plus. By using two M6 threaded rods it´s very robust and easy to adjust. As I have SKF 6000 bearings here in stock, I have to modify the diameter of the original TUSH bearings as well. The pictured guide is not really necessary, but a nice feature. It fits perfect to the original screws of the Wanhao i3 plus.
Update 15.06.2017: Added two M6 knobs for even better handling.