Wanhao Duplicator 4 3D Printer Spool Extension

This screws onto the existing filament holder and extends it so you it can hold 2 spools per holder. It has a M30 female thread one end and a male thread with a nut the other end.

I realised i uploaded the wrong nut, so i have replaced it with the correct one now, sorry for anyone downloading the previous nut. it was too tight.