Anycubic Filament Spool Axis

This is my first contribution. I just got my Anycubic i3 mega. There was a filament provided. To fit this filament better on the spool holder, I designed this helper.
Inspired by the spool cap made by Danlim (https://www.thingiverse.com/thing:2569210), I created a new one from scratch using Freecad.
I really can not understand people that they do not provide their source files to the community. I added the Freecad file, feel free to change it. If you need any converted format, just let me know.
I plan to design another one for the Material4Print filament