Universal Spool Holder for UM3

Hi
This is a remix from the UM3 spool holder, in order to make it as much as universal as possible.
I've modified it via Meshmixer, you've got the source file enclosed.

Here is the original shape:
https://www.youmagine.com/designs/ultimaker-3-3-extended-double-spool-holder

With this one, I can handle all internal diameter spool I want!

Let me know any optimization you will do if any?