CR-10S spool holder upgrade

*updates below the text*

Hey guys!!

This is my upgrade for the spool holder oft he CR-10S, but in principle it can be used on similar spool holders too. The main points of the design are:

-) No extra parts
-) Reuse oft he stock spool holder
-) Reduction of the friction
-) Centering of the spool on the holder to ensure a smooth run
-) Loading filament without deinstalling any parts

So I came up with this design. It´s still not done so if you see any issues or you have some recomm