I adjusted the bolt and nut to fit the factory mount on my Monoprice.
Helps with the more sustainable paper/cardboard filament spools as manufacturers move away from plastic and it also puts less strain on your extruder.
Credit to @HugoHuge on Thingiverse for creating the original
You'll need the other parts from his file or Matteo's
Details:
The original bolt has an outer diameter of around a 24mm, this version is slightly under 30mm.
If someone can confirm, it should also work for all of the Wanhao line that use this mount.
The author remixed this model.